harry's assignment c program

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C Programming: error: assignment to expression with array type

Hello I am a beginner in C and I was working with structures when i have this problem:

With this one I have this error ( error: assignment to expression with array type ). So I decided to do it using pointers and it actually working this is the code I used:

So the question is what is the difference between both of them since strings are pointers. thank you ..

• This has been probably answered before in SO... –  mcleod_ideafix Commented May 15, 2020 at 20:28
• Does this answer your question? C - Difference between "char var[]" and "char *var"? –  mcleod_ideafix Commented May 15, 2020 at 20:30
• 1 "since strings are pointers". That's not a correct assumption. –  mcleod_ideafix Commented May 15, 2020 at 20:31

3 Answers 3

Strings are not pointers, they are sequences of characters terminated with a null byte. These sequences are stored in arrays, which are not pointers either, but objects that live in memory and to which a pointer can point. A pointer is a variable that contains the address of an object in memory.

In the first example, you try and store a string into an array with = . C does not support this type of assignment and complains with an explicit error message. You can copy the string into the array with strcpy , assuming the destination array is large enough to store the bytes of the string, including the null terminator. "reda" uses 5 bytes, so it is OK to copy it into E[0].nom :

The second example uses a different approach: nom is now defined as a pointer to char . Defining the array E in main leaves it uninitialized, so you can only read from the pointers after you set their value to point to actual arrays of char somewhere in memory. E[0].nom = "reda"; does just that: set the address of the string literal "reda" into the member nom of E[0] . The string literal will be placed by the compiler into an array of its own, including a null terminator, and that must not be changed by the program.

• Thank you a lot . i just have another question: if we use scanf("%s",E[0].nom) it does work properly even when we are not using nom as a pointer but just as an array of chars –  Reda El Idrissi Commented May 15, 2020 at 21:07
• @RedaElIdrissi: to avoid buffer overruns, you should write scanf("%19s", E[0].nom) –  chqrlie Commented May 15, 2020 at 21:34
• @RedaElIdrissi: it works because when you pass an array to a function, the function receives a pointer to the first element of the array. –  chqrlie Commented May 15, 2020 at 21:39

First part, you try to copy two array of character (string is not a pointer, it is array of character that is terminated by null character \0 ).

If you want to copy value of an array to another, you can use memcpy , but for string, you can also use strcpy .

Second part, you make the pointer point to string literal. The pointer points to first character of the string ( r in this case).

You can see How to copy a string using a pointer

And Assigning strings to pointer in C Language

It is a lower-level concept actually.

If we say char nom[20] than its memory location will be decided at compile time and it will use stack memory (see the difference between stack memory and heap memory to gain more grasp on lover level programming). so we need to use it with indexes.

On the other hand if we create a string using the double quotes method (or the second way in which you used pointers). The double quoted strings are identified as const char* by the compiler and the string is placed at the heap memory rather than the stack memory. moreover their memory location is not decided at compile time.

a very efficient way of testing the difference between these two types of strings is that when you use sizeof() with char[20] nom it will return 20 * sizeof(char) which evaluates to 20 without any doubt. it clearly states that whether you use only 5 characters or 2 characters it will always occupy space of 20 charaters (in stack memory)

but in case of const char* if you use sizeof operator on this variable than it will return the size of the pointer variable which depends on the hardware (32bit will have 4bytes pointer) and (64bit will have 8bytes pointer). So, the sizeof operator do not shows how many characters are stored in the pointer. it just shows the size of pointer. but the benefit of using const char* is that only take memory that is required if 4 characters are stored than it will consume 5 byte memory (last byte is additionally added in case of strings) and in case of 8 characters it will consume 9 bytes and so on but note that the characters will be stored in heap(memory)

What you have been doing in the first problem is that you were assigning a string that is only stored on heap to a data types that is only stored on stack. it is not the matter of string. it the matter of memory model

I hope you might have understood. I not i can elaborate more in comments.

an additional information. Stack Memory is faster compared to the Heap Memory.

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C Exercises – Practice Questions with Solutions for C Programming

The best way to learn C programming language is by hands-on practice. This C Exercise page contains the top 30 C exercise questions with solutions that are designed for both beginners and advanced programmers. It covers all major concepts like arrays, pointers, for-loop, and many more.

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C Programming Exercises

The following are the top 30 programming exercises with solutions to help you practice online and improve your coding efficiency in the C language. You can solve these questions online in GeeksforGeeks IDE.

Q1: Write a Program to Print “Hello World!” on the Console.

In this problem, you have to write a simple program that prints “Hello World!” on the console screen.

For Example,

Click here to view the solution.

Q2: write a program to find the sum of two numbers entered by the user..

In this problem, you have to write a program that adds two numbers and prints their sum on the console screen.

Q3: Write a Program to find the size of int, float, double, and char.

In this problem, you have to write a program to print the size of the variable.

Q4: Write a Program to Swap the values of two variables.

In this problem, you have to write a program that swaps the values of two variables that are entered by the user.

Swap two numbers

Q5: Write a Program to calculate Compound Interest.

In this problem, you have to write a program that takes principal, time, and rate as user input and calculates the compound interest.

Q6: Write a Program to check if the given number is Even or Odd.

In this problem, you have to write a program to check whether the given number is even or odd.

Q7: Write a Program to find the largest number among three numbers.

In this problem, you have to write a program to take three numbers from the user as input and print the largest number among them.

Q8: Write a Program to make a simple calculator.

In this problem, you have to write a program to make a simple calculator that accepts two operands and an operator to perform the calculation and prints the result.

Q9: Write a Program to find the factorial of a given number.

In this problem, you have to write a program to calculate the factorial (product of all the natural numbers less than or equal to the given number n) of a number entered by the user.

Q10: Write a Program to Convert Binary to Decimal.

In this problem, you have to write a program to convert the given binary number entered by the user into an equivalent decimal number.

Q11: Write a Program to print the Fibonacci series using recursion.

In this problem, you have to write a program to print the Fibonacci series(the sequence where each number is the sum of the previous two numbers of the sequence) till the number entered by the user using recursion.

Fibonacci Series

Q12: Write a Program to Calculate the Sum of Natural Numbers using recursion.

In this problem, you have to write a program to calculate the sum of natural numbers up to a given number n.

Q13: Write a Program to find the maximum and minimum of an Array.

In this problem, you have to write a program to find the maximum and the minimum element of the array of size N given by the user.

Q14: Write a Program to Reverse an Array.

In this problem, you have to write a program to reverse an array of size n entered by the user. Reversing an array means changing the order of elements so that the first element becomes the last element and the second element becomes the second last element and so on.

Reverse an array

Q15: Write a Program to rotate the array to the left.

In this problem, you have to write a program that takes an array arr[] of size N from the user and rotates the array to the left (counter-clockwise direction) by D steps, where D is a positive integer. 

Q16: Write a Program to remove duplicates from the Sorted array.

In this problem, you have to write a program that takes a sorted array arr[] of size N from the user and removes the duplicate elements from the array.

Q17: Write a Program to search elements in an array (using Binary Search).

In this problem, you have to write a program that takes an array arr[] of size N and a target value to be searched by the user. Search the target value using binary search if the target value is found print its index else print ‘element is not present in array ‘.

Q18: Write a Program to reverse a linked list.

In this problem, you have to write a program that takes a pointer to the head node of a linked list, you have to reverse the linked list and print the reversed linked list.

Q18: Write a Program to create a dynamic array in C.

In this problem, you have to write a program to create an array of size n dynamically then take n elements of an array one by one by the user. Print the array elements.

Q19: Write a Program to find the Transpose of a Matrix.

In this problem, you have to write a program to find the transpose of a matrix for a given matrix A with dimensions m x n and print the transposed matrix. The transpose of a matrix is formed by interchanging its rows with columns.

Q20: Write a Program to concatenate two strings.

In this problem, you have to write a program to read two strings str1 and str2 entered by the user and concatenate these two strings. Print the concatenated string.

Q21: Write a Program to check if the given string is a palindrome string or not.

In this problem, you have to write a program to read a string str entered by the user and check whether the string is palindrome or not. If the str is palindrome print ‘str is a palindrome’ else print ‘str is not a palindrome’. A string is said to be palindrome if the reverse of the string is the same as the string.

Q22: Write a program to print the first letter of each word.

In this problem, you have to write a simple program to read a string str entered by the user and print the first letter of each word in a string.

Q23: Write a program to reverse a string using recursion

In this problem, you have to write a program to read a string str entered by the user, and reverse that string means changing the order of characters in the string so that the last character becomes the first character of the string using recursion. 

reverse a string

Q24: Write a program to Print Half half-pyramid pattern.

In this problem, you have to write a simple program to read the number of rows (n) entered by the user and print the half-pyramid pattern of numbers. Half pyramid pattern looks like a right-angle triangle of numbers having a hypotenuse on the right side.

Q25: Write a program to print Pascal’s triangle pattern.

In this problem, you have to write a simple program to read the number of rows (n) entered by the user and print Pascal’s triangle pattern. Pascal’s Triangle is a pattern in which the first row has a single number 1 all rows begin and end with the number 1. The numbers in between are obtained by adding the two numbers directly above them in the previous row.

Pascal’s Triangle

Q26: Write a program to sort an array using Insertion Sort.

In this problem, you have to write a program that takes an array arr[] of size N from the user and sorts the array elements in ascending or descending order using insertion sort.

Q27: Write a program to sort an array using Quick Sort.

In this problem, you have to write a program that takes an array arr[] of size N from the user and sorts the array elements in ascending order using quick sort.

Q28: Write a program to sort an array of strings.

In this problem, you have to write a program that reads an array of strings in which all characters are of the same case entered by the user and sort them alphabetically. 

Q29: Write a program to copy the contents of one file to another file.

In this problem, you have to write a program that takes user input to enter the filenames for reading and writing. Read the contents of one file and copy the content to another file. If the file specified for reading does not exist or cannot be opened, display an error message “Cannot open file: file_name” and terminate the program else print “Content copied to file_name”

Q30: Write a program to store information on students using structure.

In this problem, you have to write a program that stores information about students using structure. The program should create various structures, each representing a student’s record. Initialize the records with sample data having data members’ Names, Roll Numbers, Ages, and Total Marks. Print the information for each student.

We hope after completing these C exercises you have gained a better understanding of C concepts. Learning C language is made easier with this exercise sheet as it helps you practice all major C concepts. Solving these C exercise questions will take you a step closer to becoming a C programmer.

Frequently Asked Questions (FAQs)

Q1. what are some common mistakes to avoid while doing c programming exercises.

Some of the most common mistakes made by beginners doing C programming exercises can include missing semicolons, bad logic loops, uninitialized pointers, and forgotten memory frees etc.

Q2. What are the best practices for beginners starting with C programming exercises?

Best practices for beginners starting with C programming exercises: Start with easy codes Practice consistently Be creative Think before you code Learn from mistakes Repeat!

Q3. How do I debug common errors in C programming exercises?

You can use the following methods to debug a code in C programming exercises Read the error message carefully Read code line by line Try isolating the error code Look for Missing elements, loops, pointers, etc Check error online

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Answer to Question #245654 in C for harry

[Binary search and overflow] Write a C program with a function that performs binary

search. Assume that the elements of the array are unsigned integers, and the following

elements are present along with other elements in the array: 4294967290, 4294967295,

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C Programming

Due: 11:00pm, Friday September 6, 2024

Max grace days: 0

Assignment adapted from CMU Introduction to Computer Systems, Fall 2017

The purpose of this assignment will give you practice manipulating pointers in C. This assignment should mostly be a review of material from CSC 136. Some of the skills tested are:

• Explicit memory management.
• Creating and manipulating pointer-based data structures.
• Implementing robust code that operates correctly with invalid arguments, including NULL pointers.

Get the Assignment Code

Login to your university Unix account and copy the assignment code to a location under your home directory:

where LOCATION is a directory of your choosing.

Then execute the command

Description

This assignment involves implementing a queue, supporting both last-in, first-out (LIFO) and first-in, first-out (FIFO) queueing disciplines. The underlying data structure is a singly-linked list, enhanced to make some of the operations more efficient.

The file queue.h contains declarations of the following structures:

These are combined to implement a queue, as illustrated in the following figure:

The top-level representation of a queue is a structure of type queue_t . In the starter code, this structure contains only a single field “ head ”, but you will want to add other fields. The queue contents are represented as a singly-linked list, with each element represented by a structure of type list_ele_t that has the fields “ value ” and “ next ”, storing a queue value and a pointer to the next list element respectively. You may add other fields to this structure, although you should not need to do so.

In the starter code, a queue is a pointer of type queue_t * ; we distinguish two special cases: a NULL queue is one for which the pointer is set to NULL , an empty queue is one pointing to a valid queue_t structure with a head field set to NULL . You need to properly handle both of these cases, as well as queues containing one or more elements.

Your task is to modify the code in queue.h and queue.c to fully implement the following functions:

• q_new : create a new, empty queue.
• q_free : free all storage usted by a queue.
• q_insert_head : attempt to insert a new element at the head of the queue.
• q_insert_tail : attempt to insert a new element at the tail of the queue.
• q_remove_head : attempt to remove the element at the head of the queue.
• q_size : compute the number of elements in the queue.
• q_reverse : reorder the list so that the queue elements are reversed in order.

The following notes are about how you must implement these functions.

The functions q_insert_tail and q_size need to meet the required performance standards. The implementations must operate in constant time, that is, the time required is independent of the queue size. You can do this by including additional fields in the queue_t data structure and managing these values properly as list elements are inserted, removed, and reversed.

You must implement q_reverse in a way that does not require allocating any additional memory. Instead, your code should modify the pointers in the exisitng list. Implementations that require allocating new list elements will fail the performance tests, due to the way the testing code monitors calls to free and malloc .

Your program will be tested on queues with over 1,000,000 elements. You will find that you cannot traverse such long lists using recursive functions, since that would require too much stack space.

Building and Testing

A makefile is included with the assignment code. The code can be compiled by executing the command

from within the assignment directory.

If there are no errors, an executable named qtest will be generated. This program provides a command line interface for creating, modifying, and examining queues. Documentation on the available commands can be found by starting the program and running the help command:

The file traces/trace-eg.cmd has the following example command sequence:

This sequence of commands can be executed by running qtest in batch mode:

The traces directory contains 14 trace files with names of the form trace-k-cat.txt where k is the trace number and cat specifies the category of properties that are tested. Each trace consists of a sequence of commands similar to those shown above.

Turning in the Assignment

Grading criteria.

Your program will be evaluated using the 14 traces described above. You will be given credit (either 7 or 8 points, depending on the trace) for each one that executes correctly. The maximum total score is 100. You can run all the traces and get the respective scores by executing the command:

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