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Assignment Operators in C

In C language, the assignment operator stores a certain value in an already declared variable. A variable in C can be assigned the value in the form of a literal, another variable, or an expression.

The value to be assigned forms the right-hand operand, whereas the variable to be assigned should be the operand to the left of the " = " symbol, which is defined as a simple assignment operator in C.

In addition, C has several augmented assignment operators.

The following table lists the assignment operators supported by the C language −

Operator Description Example
= Simple assignment operator. Assigns values from right side operands to left side operand C = A + B will assign the value of A + B to C
+= Add AND assignment operator. It adds the right operand to the left operand and assign the result to the left operand. C += A is equivalent to C = C + A
-= Subtract AND assignment operator. It subtracts the right operand from the left operand and assigns the result to the left operand. C -= A is equivalent to C = C - A
*= Multiply AND assignment operator. It multiplies the right operand with the left operand and assigns the result to the left operand. C *= A is equivalent to C = C * A
/= Divide AND assignment operator. It divides the left operand with the right operand and assigns the result to the left operand. C /= A is equivalent to C = C / A
%= Modulus AND assignment operator. It takes modulus using two operands and assigns the result to the left operand. C %= A is equivalent to C = C % A
<<= Left shift AND assignment operator. C <<= 2 is same as C = C << 2
>>= Right shift AND assignment operator. C >>= 2 is same as C = C >> 2
&= Bitwise AND assignment operator. C &= 2 is same as C = C & 2
^= Bitwise exclusive OR and assignment operator. C ^= 2 is same as C = C ^ 2
|= Bitwise inclusive OR and assignment operator. C |= 2 is same as C = C | 2

Simple Assignment Operator (=)

The = operator is one of the most frequently used operators in C. As per the ANSI C standard, all the variables must be declared in the beginning. Variable declaration after the first processing statement is not allowed.

You can declare a variable to be assigned a value later in the code, or you can initialize it at the time of declaration.

You can use a literal, another variable, or an expression in the assignment statement.

Once a variable of a certain type is declared, it cannot be assigned a value of any other type. In such a case the C compiler reports a type mismatch error.

In C, the expressions that refer to a memory location are called "lvalue" expressions. A lvalue may appear as either the left-hand or right-hand side of an assignment.

On the other hand, the term rvalue refers to a data value that is stored at some address in memory. A rvalue is an expression that cannot have a value assigned to it which means an rvalue may appear on the right-hand side but not on the left-hand side of an assignment.

Variables are lvalues and so they may appear on the left-hand side of an assignment. Numeric literals are rvalues and so they may not be assigned and cannot appear on the left-hand side. Take a look at the following valid and invalid statements −

Augmented Assignment Operators

In addition to the = operator, C allows you to combine arithmetic and bitwise operators with the = symbol to form augmented or compound assignment operator. The augmented operators offer a convenient shortcut for combining arithmetic or bitwise operation with assignment.

For example, the expression "a += b" has the same effect of performing "a + b" first and then assigning the result back to the variable "a".

Run the code and check its output −

Similarly, the expression "a <<= b" has the same effect of performing "a << b" first and then assigning the result back to the variable "a".

Here is a C program that demonstrates the use of assignment operators in C −

When you compile and execute the above program, it will produce the following result −

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1. Simple Assignment Operator (=)

Example of simple assignment operator.

2. Compound Assignment Operators

+=addition assignmentIt adds the right operand to the left operand and assigns the result to the left operand.
-=subtraction assignmentIt subtracts the right operand from the left operand and assigns the result to the left operand.
*=multiplication assignmentIt multiplies the right operand with the left operand and assigns the result to the left operand
/=division assignmentIt divides the left operand with the right operand and assigns the result to the left operand.
%=modulo assignmentIt takes modulus using two operands and assigns the result to the left operand.

Example of Augmented Arithmetic and Assignment Operators

&=bitwise AND assignmentIt performs the bitwise AND operation on the variable with the value on the right
|=bitwise OR assignmentIt performs the bitwise OR operation on the variable with the value on the right
^=bitwise XOR assignmentIt performs the bitwise XOR operation on the variable with the value on the right
<<=bitwise left shift assignmentShifts the bits of the variable to the left by the value on the right
>>=bitwise right shift assignmentShifts the bits of the variable to the right by the value on the right

Example of Augmented Bitwise and Assignment Operators

Practice problems on assignment operators in c, 1. what will the value of "x" be after the execution of the following code, 2. after executing the following code, what is the value of the number variable, benefits of using assignment operators, best practices and tips for using the assignment operator, live classes schedule.

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Home » Learn C Programming from Scratch » C Assignment Operators

C Assignment Operators

Summary : in this tutorial, you’ll learn about the C assignment operators and how to use them effectively.

Introduction to the C assignment operators

An assignment operator assigns the vale of the right-hand operand to the left-hand operand. The following example uses the assignment operator (=) to assign 1 to the counter variable:

After the assignmment, the counter variable holds the number 1.

The following example adds 1 to the counter and assign the result to the counter:

The = assignment operator is called a simple assignment operator. It assigns the value of the left operand to the right operand.

Besides the simple assignment operator, C supports compound assignment operators. A compound assignment operator performs the operation specified by the additional operator and then assigns the result to the left operand.

The following example uses a compound-assignment operator (+=):

The expression:

is equivalent to the following expression:

The following table illustrates the compound-assignment operators in C:

OperatorOperation PerformedExampleEquivalent expression
Multiplication assignmentx *= yx = x * y
Division assignmentx /= yx = x / y
Remainder assignmentx %= yx = x % y
Addition assignmentx += yx = x + y
Subtraction assignmentx -= yx = x – y
Left-shift assignmentx <<= yx = x <<=y
Right-shift assignmentx >>=yx = x >>= y
Bitwise-AND assignmentx &= yx = x & y
Bitwise-exclusive-OR assignmentx ^= yx = x ^ y
Bitwise-inclusive-OR assignmentx |= yx = x | y
  • A simple assignment operator assigns the value of the left operand to the right operand.
  • A compound assignment operator performs the operation specified by the additional operator and then assigns the result to the left operand.

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C Assignment Operators

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An assignment operation assigns the value of the right-hand operand to the storage location named by the left-hand operand. Therefore, the left-hand operand of an assignment operation must be a modifiable l-value. After the assignment, an assignment expression has the value of the left operand but isn't an l-value.

assignment-expression :   conditional-expression   unary-expression assignment-operator assignment-expression

assignment-operator : one of   = *= /= %= += -= <<= >>= &= ^= |=

The assignment operators in C can both transform and assign values in a single operation. C provides the following assignment operators:

Operator Operation Performed
Simple assignment
Multiplication assignment
Division assignment
Remainder assignment
Addition assignment
Subtraction assignment
Left-shift assignment
Right-shift assignment
Bitwise-AND assignment
Bitwise-exclusive-OR assignment
Bitwise-inclusive-OR assignment

In assignment, the type of the right-hand value is converted to the type of the left-hand value, and the value is stored in the left operand after the assignment has taken place. The left operand must not be an array, a function, or a constant. The specific conversion path, which depends on the two types, is outlined in detail in Type Conversions .

  • Assignment Operators

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Assignment and shorthand assignment operator in C

Quick links.

  • Shorthand assignment

Assignment operator is used to assign value to a variable (memory location). There is a single assignment operator = in C. It evaluates expression on right side of = symbol and assigns evaluated value to left side the variable.

For example consider the below assignment table.

OperationDescription
Assigns 10 to variable
Evaluates expression and assign result to
Evaluates and assign result to
Error, you cannot re-assign a value to a constant
Error, you cannot re-assign a value to a constant

The RHS of assignment operator must be a constant, expression or variable. Whereas LHS must be a variable (valid memory location).

Shorthand assignment operator

C supports a short variant of assignment operator called compound assignment or shorthand assignment. Shorthand assignment operator combines one of the arithmetic or bitwise operators with assignment operator.

For example, consider following C statements.

The above expression a = a + 2 is equivalent to a += 2 .

Similarly, there are many shorthand assignment operators. Below is a list of shorthand assignment operators in C.

Shorthand assignment operatorExampleMeaning

Assignment Operators in C

C Assignment OperatorsExampleExplanation
=x = 25Value 25 is assigned to x
+=x += 25This is the same as x = x + 25
-=x -= 25This is the same as x = x – 25
*=y *= 25This is the same as y = y * 25
/=y /= 25This is the same as y = y / 25
%=y%= 25This is the same as y = y % 25

Assignment Operators in C Example

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Assignment Operators In C [ Full Information With Examples ]

Assignment Operators In C

Assignment Operators In C

Assignment operators is a binary operator which is used to assign values in a variable , with its right and left sides being a one-one operand. The operand on the left side is variable in which the value is assigned and the right side operands can contain any of the constant, variable, and expression.

The Assignment operator is a lower priority operator. its priority has much lower than the rest of the other operators. Its priority is more than just the comma operator. The priority of all other operators is more than the assignment operator.

We can assign the same value to multiple variables simultaneously by the assignment operator.

x = y = z = 100

Here x, y, and z are initialized to 100.

In C language, the assignment operator can be divided into two categories.

  • Simple assignment operator
  • Compound assignment operators

1. Simple Assignment Operator In C

This operator is used to assign left-side values ​​to the right-side operands, simple assignment operators are represented by (=).

2. Compound Assignment Operators In C

Compound Assignment Operators use the old value of a variable to calculate its new value and reassign the value obtained from the calculation to the same variable.

Examples of compound assignment operators are: (Example: + =, – =, * =, / =,% =, & =, ^ =)

Look at these two statements:

Here in this example, adding 5 to the x variable in the second statement is again being assigned to the x variable.

Compound Assignment Operators provide us with the C language to perform such operation even more effecient and in less time.

Syntax of Compound Assignment Operators

Here op can be any arithmetic operators (+, -, *, /,%).

The above statement is equivalent to the following depending on the function:

Let us now know about some important compound assignment operators one by one.

“+ =” -: This operator adds the right operand to the left operand and assigns the output to the left operand.

“- =” -: This operator subtracts the right operand from the left operand and returns the result to the left operand.

“* =” -: This operator multiplies the right operand with the left operand and assigns the result to the left operand.

“/ =” -: This operator splits the left operand with the right operand and assigns the result to the left operand.

“% =” -: This operator takes the modulus using two operands and assigns the result to the left operand.

There are many other assignment operators such as left shift and (<< =) operator, right shift and operator (>> =), bitwise and assignment operator (& =), bitwise OR assignment operator (^ =)

List of Assignment Operators In C

=sum = 101;101 is assigned to variable sum
+=sum += 101; This is same as sum = sum + 101
-=sum -= 101; This is same as sum = sum – 101
*=sum *= 101; This is same as sum = sum * 101
/=sum /= 101; This is same as sum = sum/101
%=sum %= 101; This is same as sum = sum % 101
&=sum&=101; This is same as sum = sum & 101
^=sum ^= 101; This is same as sum = sum ^ 101

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Assignment Operators in C

C++ Course: Learn the Essentials

Operators are a fundamental part of all the computations that computers perform. Today we will learn about one of them known as Assignment Operators in C. Assignment Operators are used to assign values to variables. The most common assignment operator is = . Assignment Operators are Binary Operators.

Types of Assignment Operators in C

LHS and RHS Operands

Here is a list of the assignment operators that you can find in the C language:

  • basic assignment ( = )
  • subtraction assignment ( -= )
  • addition assignment ( += )
  • division assignment ( /= )
  • multiplication assignment ( *= )
  • modulo assignment ( %= )
  • bitwise XOR assignment ( ^= )
  • bitwise OR assignment ( |= )
  • bitwise AND assignment ( &= )
  • bitwise right shift assignment ( >>= )
  • bitwise left shift assignment ( <<= )

Working of Assignment Operators in C

This is the complete list of all assignment operators in C. To read the meaning of operator please keep in mind the above example.

OperatorMeaning Of OperatorExampleSame as
=Simple assignment operatorx=yx=y
+=Add left operand to right operand then assign result to left operandx+=yx=x+y
-=subtract right operand from left operand then assign result to left operandx-=yx=x-y
*=multiply left operand with right operand then assign result to left operandx*=yx=x*y
/=divide left operand with right operand then assign result to left operandx/=yx=x/y
%=take modulus left operand with right operand then assigned result in left operandx%=yx=x%y
<<=Left Shift Assignment Operator means the left operand is left shifted by right operand value and assigned value to left operandx<<=yx=x<<y
>>=Right shift Assignment Operator means the left operand is right shifted by right operand value and assigned value to left operandx>>=yx=x>>y
&=Bitwise AND Assignment Operator means does AND on every bit of left operand and right operand and assigned value to left operandx&=yx=x&y
|=Bitwise inclusive OR Assignment Operator means does OR on every bit of left operand and right operand and assigned value to left operandx|=yx=x|y
^=Bitwise exclusive OR Assignment Operator means does XOR on every bit of left operand and right operand and assigned value to left operandx^=yx=x^y

Example for Assignment Operators in C

Basic assignment ( = ) :

Subtraction assignment ( -= ) :

Addition assignment ( += ) :

Division assignment ( /= ) :

Multiplication assignment ( *= ) :

Modulo assignment ( %= ) :

Bitwise XOR assignment ( ^= ) :

Bitwise OR assignment ( |= ) :

Bitwise AND assignment ( &= ) :

Bitwise right shift assignment ( >>= ) :

Bitwise left shift assignment ( <<= ) :

This is the detailed explanation of all the assignment operators in C that we have. Hopefully, This is clear to you.

Practice Problems on Assignment Operators in C

1. what will be the value of a after the following code is executed.

A) 10 B) 11 C) 12 D) 15

Answer – C. 12 Explanation: a starts at 10, increases by 5 to 15, then decreases by 3 to 12. So, a is 12.

2. After executing the following code, what is the value of num ?

A) 4 B) 8 C) 16 D) 32

Answer: C) 16 Explanation: After right-shifting 8 (binary 1000) by one and then left-shifting the result by two, the value becomes 16 (binary 10000).

Q. How does the /= operator function? Is it a combination of two other operators?

A. The /= operator is a compound assignment operator in C++. It divides the left operand by the right operand and assigns the result to the left operand. It is equivalent to using the / operator and then the = operator separately.

Q. What is the most basic operator among all the assignment operators available in the C language?

A. The most basic assignment operator in the C language is the simple = operator, which is used for assigning a value to a variable.

  • Assignment operators are used to assign the result of an expression to a variable.
  • There are two types of assignment operators in C. Simple assignment operator and compound assignment operator.
  • Compound Assignment operators are easy to use and the left operand of expression needs not to write again and again.
  • They work the same way in C++ as in C.

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Assignment operator in c.

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Last Updated on June 23, 2023 by Prepbytes

what is assignment operator in c

This type of operator is employed for transforming and assigning values to variables within an operation. In an assignment operation, the right side represents a value, while the left side corresponds to a variable. It is essential that the value on the right side has the same data type as the variable on the left side. If this requirement is not fulfilled, the compiler will issue an error.

What is Assignment Operator in C language?

In C, the assignment operator serves the purpose of assigning a value to a variable. It is denoted by the equals sign (=) and plays a vital role in storing data within variables for further utilization in code. When using the assignment operator, the value present on the right-hand side is assigned to the variable on the left-hand side. This fundamental operation allows developers to store and manipulate data effectively throughout their programs.

Example of Assignment Operator in C

For example, consider the following line of code:

Types of Assignment Operators in C

Here is a list of the assignment operators that you can find in the C language:

Simple assignment operator (=): This is the basic assignment operator, which assigns the value on the right-hand side to the variable on the left-hand side.

Addition assignment operator (+=): This operator adds the value on the right-hand side to the variable on the left-hand side and assigns the result back to the variable.

x += 3; // Equivalent to x = x + 3; (adds 3 to the current value of "x" and assigns the result back to "x")

Subtraction assignment operator (-=): This operator subtracts the value on the right-hand side from the variable on the left-hand side and assigns the result back to the variable.

x -= 4; // Equivalent to x = x – 4; (subtracts 4 from the current value of "x" and assigns the result back to "x")

* Multiplication assignment operator ( =):** This operator multiplies the value on the right-hand side with the variable on the left-hand side and assigns the result back to the variable.

x = 2; // Equivalent to x = x 2; (multiplies the current value of "x" by 2 and assigns the result back to "x")

Division assignment operator (/=): This operator divides the variable on the left-hand side by the value on the right-hand side and assigns the result back to the variable.

x /= 2; // Equivalent to x = x / 2; (divides the current value of "x" by 2 and assigns the result back to "x")

Bitwise AND assignment (&=): The bitwise AND assignment operator "&=" performs a bitwise AND operation between the value on the left-hand side and the value on the right-hand side. It then assigns the result back to the left-hand side variable.

x &= 3; // Binary: 0011 // After bitwise AND assignment: x = 1 (Binary: 0001)

Bitwise OR assignment (|=): The bitwise OR assignment operator "|=" performs a bitwise OR operation between the value on the left-hand side and the value on the right-hand side. It then assigns the result back to the left-hand side variable.

x |= 3; // Binary: 0011 // After bitwise OR assignment: x = 7 (Binary: 0111)

Bitwise XOR assignment (^=): The bitwise XOR assignment operator "^=" performs a bitwise XOR operation between the value on the left-hand side and the value on the right-hand side. It then assigns the result back to the left-hand side variable.

x ^= 3; // Binary: 0011 // After bitwise XOR assignment: x = 6 (Binary: 0110)

Left shift assignment (<<=): The left shift assignment operator "<<=" shifts the bits of the value on the left-hand side to the left by the number of positions specified by the value on the right-hand side. It then assigns the result back to the left-hand side variable.

x <<= 2; // Binary: 010100 (Shifted left by 2 positions) // After left shift assignment: x = 20 (Binary: 10100)

Right shift assignment (>>=): The right shift assignment operator ">>=" shifts the bits of the value on the left-hand side to the right by the number of positions specified by the value on the right-hand side. It then assigns the result back to the left-hand side variable.

x >>= 2; // Binary: 101 (Shifted right by 2 positions) // After right shift assignment: x = 5 (Binary: 101)

Conclusion The assignment operator in C, denoted by the equals sign (=), is used to assign a value to a variable. It is a fundamental operation that allows programmers to store data in variables for further use in their code. In addition to the simple assignment operator, C provides compound assignment operators that combine arithmetic or bitwise operations with assignment, allowing for concise and efficient code.

FAQs related to Assignment Operator in C

Q1. Can I assign a value of one data type to a variable of another data type? In most cases, assigning a value of one data type to a variable of another data type will result in a warning or error from the compiler. It is generally recommended to assign values of compatible data types to variables.

Q2. What is the difference between the assignment operator (=) and the comparison operator (==)? The assignment operator (=) is used to assign a value to a variable, while the comparison operator (==) is used to check if two values are equal. It is important not to confuse these two operators.

Q3. Can I use multiple assignment operators in a single statement? No, it is not possible to use multiple assignment operators in a single statement. Each assignment operator should be used separately for assigning values to different variables.

Q4. Are there any limitations on the right-hand side value of the assignment operator? The right-hand side value of the assignment operator should be compatible with the data type of the left-hand side variable. If the data types are not compatible, it may lead to unexpected behavior or compiler errors.

Q5. Can I assign the result of an expression to a variable using the assignment operator? Yes, it is possible to assign the result of an expression to a variable using the assignment operator. For example, x = y + z; assigns the sum of y and z to the variable x.

Q6. What happens if I assign a value to an uninitialized variable? Assigning a value to an uninitialized variable will initialize it with the assigned value. However, it is considered good practice to explicitly initialize variables before using them to avoid potential bugs or unintended behavior.

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General
(C++11)
(C++20)
(C++26)
(C++11)
(C++11)
-expression
-expression
-expression
(C++11)
(C++11)
(C++17)
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Assignment operators modify the value of the object.

Operator name  Syntax  Prototype examples (for class T)
Inside class definition Outside class definition
simple assignment Yes T& T::operator =(const T2& b);
addition assignment Yes T& T::operator +=(const T2& b); T& operator +=(T& a, const T2& b);
subtraction assignment Yes T& T::operator -=(const T2& b); T& operator -=(T& a, const T2& b);
multiplication assignment Yes T& T::operator *=(const T2& b); T& operator *=(T& a, const T2& b);
division assignment Yes T& T::operator /=(const T2& b); T& operator /=(T& a, const T2& b);
remainder assignment Yes T& T::operator %=(const T2& b); T& operator %=(T& a, const T2& b);
bitwise AND assignment Yes T& T::operator &=(const T2& b); T& operator &=(T& a, const T2& b);
bitwise OR assignment Yes T& T::operator |=(const T2& b); T& operator |=(T& a, const T2& b);
bitwise XOR assignment Yes T& T::operator ^=(const T2& b); T& operator ^=(T& a, const T2& b);
bitwise left shift assignment Yes T& T::operator <<=(const T2& b); T& operator <<=(T& a, const T2& b);
bitwise right shift assignment Yes T& T::operator >>=(const T2& b); T& operator >>=(T& a, const T2& b);

this, and most also return *this so that the user-defined operators can be used in the same manner as the built-ins. However, in a user-defined operator overload, any type can be used as return type (including void). can be any type including .
Definitions Assignment operator syntax Built-in simple assignment operator Assignment from an expression Assignment from a non-expression initializer clause Built-in compound assignment operator Example Defect reports See also

[ edit ] Definitions

Copy assignment replaces the contents of the object a with a copy of the contents of b ( b is not modified). For class types, this is performed in a special member function, described in copy assignment operator .

replaces the contents of the object a with the contents of b, avoiding copying if possible (b may be modified). For class types, this is performed in a special member function, described in .

(since C++11)

For non-class types, copy and move assignment are indistinguishable and are referred to as direct assignment .

Compound assignment replace the contents of the object a with the result of a binary operation between the previous value of a and the value of b .

[ edit ] Assignment operator syntax

The assignment expressions have the form

target-expr new-value (1)
target-expr op new-value (2)
target-expr - the expression to be assigned to
op - one of *=, /= %=, += -=, <<=, >>=, &=, ^=, |=
new-value - the expression (until C++11) (since C++11) to assign to the target
  • ↑ target-expr must have higher precedence than an assignment expression.
  • ↑ new-value cannot be a comma expression, because its precedence is lower.

If new-value is not an expression, the assignment expression will never match an overloaded compound assignment operator.

(since C++11)

[ edit ] Built-in simple assignment operator

For the built-in simple assignment, the object referred to by target-expr is modified by replacing its value with the result of new-value . target-expr must be a modifiable lvalue.

The result of a built-in simple assignment is an lvalue of the type of target-expr , referring to target-expr . If target-expr is a bit-field , the result is also a bit-field.

[ edit ] Assignment from an expression

If new-value is an expression, it is implicitly converted to the cv-unqualified type of target-expr . When target-expr is a bit-field that cannot represent the value of the expression, the resulting value of the bit-field is implementation-defined.

If target-expr and new-value identify overlapping objects, the behavior is undefined (unless the overlap is exact and the type is the same).

If the type of target-expr is volatile-qualified, the assignment is deprecated, unless the (possibly parenthesized) assignment expression is a or an .

(since C++20)

new-value is only allowed not to be an expression in following situations:

is of a , and new-value is empty or has only one element. In this case, given an invented variable t declared and initialized as T t = new-value , the meaning of x = new-value  is x = t. is of class type. In this case, new-value is passed as the argument to the assignment operator function selected by .   <double> z; z = {1, 2}; // meaning z.operator=({1, 2}) z += {1, 2}; // meaning z.operator+=({1, 2})   int a, b; a = b = {1}; // meaning a = b = 1; a = {1} = b; // syntax error
(since C++11)

In overload resolution against user-defined operators , for every type T , the following function signatures participate in overload resolution:

& operator=(T*&, T*);
volatile & operator=(T*volatile &, T*);

For every enumeration or pointer to member type T , optionally volatile-qualified, the following function signature participates in overload resolution:

operator=(T&, T);

For every pair A1 and A2 , where A1 is an arithmetic type (optionally volatile-qualified) and A2 is a promoted arithmetic type, the following function signature participates in overload resolution:

operator=(A1&, A2);

[ edit ] Built-in compound assignment operator

The behavior of every built-in compound-assignment expression target-expr   op   =   new-value is exactly the same as the behavior of the expression target-expr   =   target-expr   op   new-value , except that target-expr is evaluated only once.

The requirements on target-expr and new-value of built-in simple assignment operators also apply. Furthermore:

  • For + = and - = , the type of target-expr must be an arithmetic type or a pointer to a (possibly cv-qualified) completely-defined object type .
  • For all other compound assignment operators, the type of target-expr must be an arithmetic type.

In overload resolution against user-defined operators , for every pair A1 and A2 , where A1 is an arithmetic type (optionally volatile-qualified) and A2 is a promoted arithmetic type, the following function signatures participate in overload resolution:

operator*=(A1&, A2);
operator/=(A1&, A2);
operator+=(A1&, A2);
operator-=(A1&, A2);

For every pair I1 and I2 , where I1 is an integral type (optionally volatile-qualified) and I2 is a promoted integral type, the following function signatures participate in overload resolution:

operator%=(I1&, I2);
operator<<=(I1&, I2);
operator>>=(I1&, I2);
operator&=(I1&, I2);
operator^=(I1&, I2);
operator|=(I1&, I2);

For every optionally cv-qualified object type T , the following function signatures participate in overload resolution:

& operator+=(T*&, );
& operator-=(T*&, );
volatile & operator+=(T*volatile &, );
volatile & operator-=(T*volatile &, );

[ edit ] Example

Possible output:

[ edit ] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
C++11 for assignments to class type objects, the right operand
could be an initializer list only when the assignment
is defined by a user-defined assignment operator
removed user-defined
assignment constraint
C++11 E1 = {E2} was equivalent to E1 = T(E2)
( is the type of ), this introduced a C-style cast
it is equivalent
to E1 = T{E2}
C++20 compound assignment operators for volatile
-qualified types were inconsistently deprecated
none of them
is deprecated
C++11 an assignment from a non-expression initializer clause
to a scalar value would perform direct-list-initialization
performs copy-list-
initialization instead
C++20 bitwise compound assignment operators for volatile types
were deprecated while being useful for some platforms
they are not
deprecated

[ edit ] See also

Operator precedence

Operator overloading

Common operators

a = b
a += b
a -= b
a *= b
a /= b
a %= b
a &= b
a |= b
a ^= b
a <<= b
a >>= b

++a
--a
a++
a--

+a
-a
a + b
a - b
a * b
a / b
a % b
~a
a & b
a | b
a ^ b
a << b
a >> b

!a
a && b
a || b

a == b
a != b
a < b
a > b
a <= b
a >= b
a <=> b

a[...]
*a
&a
a->b
a.b
a->*b
a.*b

function call
a(...)
comma
a, b
conditional
a ? b : c
Special operators

converts one type to another related type
converts within inheritance hierarchies
adds or removes -qualifiers
converts type to unrelated type
converts one type to another by a mix of , , and
creates objects with dynamic storage duration
destructs objects previously created by the new expression and releases obtained memory area
queries the size of a type
queries the size of a (since C++11)
queries the type information of a type
checks if an expression can throw an exception (since C++11)
queries alignment requirements of a type (since C++11)

for Assignment operators
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Assignment Operator in C

Using assignment operators, we can assign value to the variables.

Equality sign (=) is used as an assignment operator in C.

Here, value 5 has assigned to the variable var.

Here, value of a has assigned to the variable b . Now, both a and b will hold value 10 .

Basically, the value of right-side operand will be assigned to the left side operand.

Pictorial Explanation

How assignment works

Compound assignment operators

Operator

Meaning

Example
(a = 10 , b = 5)

L=L+R
add left and right operand and assign result in left

same as a=a+b
after execution will hold 15

L=L-R
subtract right operand from left operand and assign result in left

same as a=a-b
after execution will hold 5

L=L*R
multiply both right and left operand and store result in left

same as a=a*b
after execution will hold 50

L=L/R
divides left operand by right operand and store result in left

same as a=a/b
after execution will hold 2

L=L%R
After left and right operand division, the remainder will be stored in left

same as a=a%b
after execution will hold 0

Sample Program

21.12 — Overloading the assignment operator

21.12 — Overloading the assignment operator

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Java Tutorial

Control statements, java object class, java inheritance, java polymorphism, java abstraction, java encapsulation, java oops misc.

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Java is a popular programming language that software developers use to construct a wide range of applications. It is a simple, robust, and platform-independent object-oriented language. There are various types of assignment operators in Java, each with its own function.

In this section, we will look at Java's many types of assignment operators, how they function, and how they are utilized.

To assign a value to a variable, use the basic assignment operator (=). It is the most fundamental assignment operator in Java. It assigns the value on the right side of the operator to the variable on the left side.

In the above example, the variable x is assigned the value 10.

To add a value to a variable and subsequently assign the new value to the same variable, use the addition assignment operator (+=). It takes the value on the right side of the operator, adds it to the variable's existing value on the left side, and then assigns the new value to the variable.

To subtract one numeric number from another, use the subtraction operator. All numeric data types, including integers and floating-point values, can be utilised with it. Here's an illustration:

In this example, we create two integer variables, a and b, subtract b from a, and then assign the result to the variable c.

To combine two numerical numbers, use the multiplication operator. All numeric data types, including integers and floating-point values, can be utilised with it. Here's an illustration:

In this example, we declare two integer variables, a and b, multiply their values using the multiplication operator, and then assign the outcome to the third variable, c.

To divide one numerical number by another, use the division operator. All numeric data types, including integers and floating-point values, can be utilised with it. Here's an illustration:

In this example, we declare two integer variables, a and b, divide them by one another using the division operator, and then assign the outcome to the variable c.

It's vital to remember that when two numbers are divided, the outcome will also be an integer, and any residual will be thrown away. For instance:

The modulus assignment operator (%=) computes the remainder of a variable divided by a value and then assigns the resulting value to the same variable. It takes the value on the right side of the operator, divides it by the current value of the variable on the left side, and then assigns the new value to the variable on the left side.





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C++ variant can't be assigned as implicitly deleted [closed]

Im trying to use a variant to be able to store and access two different classes, Node and Nbody, for a barnes Hutt algorithm. However, I get the error:

error: object of type 'std::variant<Nbody, Blank, std::unique_ptr>' cannot be assigned because its copy assignment operator is implicitly deleted

Here is the header file sections using that.. If more code is nessecary I can provide:

CallumDoesStuff's user avatar

  • 6 std::unique_ptr can't be copied only moved from, if it could be copied then the object it manages would have 2 owners. –  Richard Critten Commented yesterday
  • 1 Please provide a minimal reproducible example that 1) closes the Node class properly, 2) uses the Node class, and 3) demonstrates the error you are seeing. Because I do not see any error when I try using this code: onlinegdb.com/zpQrFpKSn –  Remy Lebeau Commented yesterday
  • This is too mach irrelevant and invalid/not complete code. –  3CxEZiVlQ Commented yesterday

Browse other questions tagged c++ arrays c++11 or ask your own question .

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Augmented Assignment Operators in Python

An assignment operator is an operator that is used to assign some value to a variable. Like normally in Python, we write “ a = 5 “ to assign value 5 to variable ‘a’. Augmented assignment operators have a special role to play in Python programming. It basically combines the functioning of the arithmetic or bitwise operator with the assignment operator. So assume if we need to add 7 to a variable “a” and assign the result back to “a”, then instead of writing normally as “ a = a + 7 “, we can use the augmented assignment operator and write the expression as “ a += 7 “. Here += has combined the functionality of arithmetic addition and assignment.

So, augmented assignment operators provide a short way to perform a binary operation and assigning results back to one of the operands. The way to write an augmented operator is just to write that binary operator and assignment operator together. In Python, we have several different augmented assignment operators like +=, -=, *=, /=, //=, **=, |=, &=, >>=, <<=, %= and ^=. Let’s see their functioning with the help of some exemplar codes:

1. Addition and Assignment (+=): This operator combines the impact of arithmetic addition and assignment. Here,

 a = a + b can be written as a += b

2. Subtraction and Assignment (-=): This operator combines the impact of subtraction and assignment.  

a = a – b can be written as a -= b

Example:  

3. Multiplication and Assignment (*=): This operator combines the functionality of multiplication and assignment.  

a = a * b can be written as a *= b

4. Division and Assignment (/=): This operator has the combined functionality of division and assignment.  

a = a / b can be written as a /= b

5. Floor Division and Assignment (//=): It performs the functioning of floor division and assignment.  

a = a // b can be written as a //= b

6. Modulo and Assignment (%=): This operator combines the impact of the modulo operator and assignment.  

a = a % b can be written as a %= b

7. Power and Assignment (**=): This operator is equivalent to the power and assignment operator together.  

a = a**b can be written as a **= b

8. Bitwise AND & Assignment (&=): This operator combines the impact of the bitwise AND operator and assignment operator. 

a = a & b can be written as a &= b

9. Bitwise OR and Assignment (|=): This operator combines the impact of Bitwise OR and assignment operator.  

a = a | b can be written as a |= b

10. Bitwise XOR and Assignment (^=): This augmented assignment operator combines the functionality of the bitwise XOR operator and assignment operator. 

a = a ^ b can be written as a ^= b

11. Bitwise Left Shift and Assignment (<<=): It puts together the functioning of the bitwise left shift operator and assignment operator.  

a = a << b can be written as a <<= b

12. Bitwise Right Shift and Assignment (>>=): It puts together the functioning of the bitwise right shift operator and assignment operator.  

a = a >> b can be written as a >>= b

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COMMENTS

  1. Assignment Operators in C

    Prerequisite: Operator Overloading The assignment operator,"=", is the operator used for Assignment. It copies the right value into the left value. Assignment Operators are predefined to operate only on built-in Data types. Assignment operator overloading is binary operator overloading.Overloading assignment operator in C++ copies all values of one

  2. Assignment Operators in C

    Simple assignment operator. Assigns values from right side operands to left side operand. C = A + B will assign the value of A + B to C. +=. Add AND assignment operator. It adds the right operand to the left operand and assign the result to the left operand. C += A is equivalent to C = C + A. -=.

  3. Assignment Operators in Programming

    Assignment operators are used in programming to assign values to variables. We use an assignment operator to store and update data within a program. They enable programmers to store data in variables and manipulate that data. The most common assignment operator is the equals sign (=), which assigns the value on the right side of the operator to ...

  4. C Programming Assignment Operators

    Assignment Operators in C are used to assign values to the variables. They come under the category of binary operators as they require two operands to operate upon. The left side operand is called a variable and the right side operand is the value. The value on the right side of the "=" is assigned to the variable on the left side of "=".

  5. C Assignment Operators

    The = assignment operator is called a simple assignment operator. It assigns the value of the left operand to the right operand. Besides the simple assignment operator, C supports compound assignment operators. A compound assignment operator performs the operation specified by the additional operator and then assigns the result to the left operand.

  6. Assignment operators

    Assignment performs implicit conversion from the value of rhs to the type of lhs and then replaces the value in the object designated by lhs with the converted value of rhs. Assignment also returns the same value as what was stored in lhs (so that expressions such as a = b = c are possible). The value category of the assignment operator is non ...

  7. C Assignment Operators

    The assignment operators in C can both transform and assign values in a single operation. C provides the following assignment operators: | =. In assignment, the type of the right-hand value is converted to the type of the left-hand value, and the value is stored in the left operand after the assignment has taken place.

  8. Assignment and shorthand assignment operator in C

    Assignment operator is used to assign value to a variable (memory location). There is a single assignment operator = in C. It evaluates expression on right side of = symbol and assigns evaluated value to left side the variable.. For example consider the below assignment table.

  9. Operators in C

    5. Assignment Operators in C. Assignment operators are used to assign value to a variable. The left side operand of the assignment operator is a variable and the right side operand of the assignment operator is a value. The value on the right side must be of the same data type as the variable on the left side otherwise the compiler will raise ...

  10. Assignment Operators in C with Examples

    Assignment operators are used to assign value to a variable. The left side of an assignment operator is a variable and on the right side, there is a value, variable, or an expression. It computes the outcome of the right side and assign the output to the variable present on the left side. C supports following Assignment operators: 1.

  11. Assignment Operators in C Example

    The Assignment operators in C are some of the Programming operators that are useful for assigning the values to the declared variables. Equals (=) operator is the most commonly used assignment operator. For example: int i = 10; The below table displays all the assignment operators present in C Programming with an example. C Assignment Operators.

  12. Assignment Operators In C [ Full Information With Examples ]

    Assignment Operators In C. Assignment operators is a binary operator which is used to assign values in a variable, with its right and left sides being a one-one operand. The operand on the left side is variable in which the value is assigned and the right side operands can contain any of the constant, variable, and expression. Example -: x = 18 ...

  13. Types of Assignment Operators in C

    A. The most basic assignment operator in the C language is the simple = operator, which is used for assigning a value to a variable. Conclusion. Assignment operators are used to assign the result of an expression to a variable. There are two types of assignment operators in C. Simple assignment operator and compound assignment operator.

  14. Assignment Operator in C

    The assignment operator in C, denoted by the equals sign (=), is used to assign a value to a variable. It is a fundamental operation that allows programmers to store data in variables for further use in their code. In addition to the simple assignment operator, C provides compound assignment operators that combine arithmetic or bitwise ...

  15. Assignment Operator in C

    Simple Assignment Operator (=): It is the operator used to assign the right side operand or variable to the left side variable. Syntax. int a = 5; or int b = a; ch = 'a'; int a = 5; or int b = a; ch = 'a'; Let's create a program to use the simple assignment operator in C. Program1.c.

  16. Assignment operators

    Correct behavior. CWG 1527. C++11. for assignments to class type objects, the right operand could be an initializer list only when the assignment is defined by a user-defined assignment operator. removed user-defined assignment constraint. CWG 1538. C++11. E1 ={E2} was equivalent to E1 = T(E2) (T is the type of E1), this introduced a C-style cast.

  17. Assignment Operator in C

    Using assignment operators, we can assign value to the variables. Equality sign (=) is used as an assignment operator in C. Here, value 5 has assigned to the variable var. int a = 10 ; int b = a; printf( "a = %d \t b = %d\n" ,a,b); return 0 ; Here, value of a has assigned to the variable b. Now, both a and b will hold value 10.

  18. What is the difference between += and =+ C assignment operators

    20. In modern C, or even moderately ancient C, += is a compound assignment operator, and =+ is parsed as two separate tokens. = and +. Punctuation tokens are allowed to be adjacent. So if you write: x += y; it's equivalent to. x = x + y; except that x is only evaluated once (which can matter if it's a more complicated expression).

  19. Operator Precedence and Associativity in C

    Prerequisite: Operator Overloading The assignment operator,"=", is the operator used for Assignment. It copies the right value into the left value. Assignment Operators are predefined to operate only on built-in Data types. Assignment operator overloading is binary operator overloading.Overloading assignment operator in C++ copies all values of one

  20. 21.12

    21.12 — Overloading the assignment operator. Alex July 22, 2024. The copy assignment operator (operator=) is used to copy values from one object to another already existing object. As of C++11, C++ also supports "Move assignment". We discuss move assignment in lesson 22.3 -- Move constructors and move assignment.

  21. Types of Assignment Operators in Java

    Simple Assignment Operator (=) To assign a value to a variable, use the basic assignment operator (=). It is the most fundamental assignment operator in Java. It assigns the value on the right side of the operator to the variable on the left side. Example:

  22. What is the difference between = (Assignment) and == (Equal to) operators

    The differences can be shown in tabular form as follows: =. ==. It is an assignment operator. It is a relational or comparison operator. It is used for assigning the value to a variable. It is used for comparing two values. It returns 1 if both the values are equal otherwise returns 0. Constant term cannot be placed on left hand side.

  23. C++ variant can't be assigned as implicitly deleted

    error: object of type 'std::variant<Nbody, Blank, std::unique_ptr>' cannot be assigned because its copy assignment operator is implicitly deleted. Here is the header file sections using that.. If more code is nessecary I can provide:

  24. Augmented Assignment Operators in Python

    An assignment operator is an operator that is used to assign some value to a variable. Like normally in Python, we write "a = 5" to assign value 5 to variable 'a'. Augmented assignment operators have a special role to play in Python programming.