C program to find the length of a string

Comprehensive Collection of C Programming Examples

In this example, you will learn how to manually find the length of a string without using the strlen() function.

To understand this example, you should understand the followingC programmingTopic:

• C programming strings

• String operations in C language using library functions

• C for loop

As you know, the best way to find the length of a string is to use the strlen() function. However, in this example, we will manually find the length of the string.

Calculate the length of a string without using the strlen() function

#include <stdio.h>
int main() {
　　　　char s[] = "Programming is fun";
　　　　int i;
　　　　for (i = 0; s[i] != '\0';　++;
　　　　
　　　　printf("String length: %d", i);
　　　　return 0;
}

Output Result

String Length:　18

Here, using the for loop, we iterate over the characters of the string from i = 0 to the character ' \0 ' (null character). In each iteration, the value of i increases1.

The length of the string will be stored in the i variable at the end of the loop.

Comprehensive Collection of C Programming Examples