Today, let’s dive into a fundamental concept in C programming – working with strings. Specifically, we’ll focus on calculating the length of a string in c. It may sound simple, but it’s an essential skill to master. So, let’s get started!

Task Description:

The task at hand is to write a function that returns the length of a string. We’ll call this function _strlen, and it will take a character pointer s as its parameter.


 int _strlen(char *s);


Before we move on to the solution, I encourage you to give it a shot on your own. Take a moment to write the code for the _strlen function and test it out. Once you’re done, come back here to compare your solution with the one provided.

Code Solution & Explanation:

int _strlen(char *s) {
    int length = 0;

    while (*s != '
int _strlen(char *s) {
int length = 0;
while (*s != '\0') {
return length;
') { length++; s++; } return length; }

In the _strlen function, we initialize a variable length to 0. Then, using a while loop, we iterate through the string s until we reach the null terminator character '\0'.

Inside the loop, we increment length by 1 and move the pointer s to the next character in the string.

Finally, we return the calculated length.

Output & Usage:

To see the function in action, let’s use it with a simple example:

#include "main.h"
#include <stdio.h>

 * main - check the code
 * Return: Always 0.
int main(void)
    char *str;
    int len;

    str = "My first strlen!";
    len = _strlen(str);
    printf("%d\n", len);
    return (0);

Expected Output:

The output of the code above should be:

The length of the string is: 16


Congratulations on completing the task!

By now, you should have a solid understanding of how to calculate the length of a string in C. If you faced any challenges or have questions, don’t hesitate to ask for help. You can use our forum, ASK A QUESTION, to seek further assistance, share your solutions, or discuss any related topics with fellow coders.

Remember, practice makes perfect. So keep exploring and experimenting with strings in C, as they are a crucial part of many programming tasks.

Happy coding, and see you in the next challenge!

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