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

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To understand this example, you should have the knowledge of the following C programming topics:

• C Programming Strings
• String Manipulations In C Programming Using Library Functions
• C for Loop

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

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Calculate Length of String without Using strlen() Function

#include 
int main() {
    char s[] = "Programming is fun";
    int i;

    for (i = 0; s[i] != '\0'; ++i);
    
    printf("Length of the string: %d", i);
    return 0;
}

Output

Length of the string: 18

Here, using a for loop, we have iterated over characters of the string from i = 0 to until '\0' (null character) is encountered. In each iteration, the value of i is increased by 1.

When the loop ends, the length of the string will be stored in the i variable.