length of str in c code example

Example 1: string length c

#include <stdio.h>
#include <string.h>
int main()
{
    char a[20]="Program";
    char b[20]={'P','r','o','g','r','a','m','\0'};

    // using the %zu format specifier to print size_t
    printf("Length of string a = %zu \n",strlen(a));
    printf("Length of string b = %zu \n",strlen(b));

    return 0;
}

Example 2: how to find length of string in c

// include all the libraries used in the program.
#include <stdio.h>
#include <string.h>

// Calculate Length of String Using strlen() Function
int main() 
{ 
    char a[100]; int length;
	printf("Enter a string to calculate its length\n"); gets(a);
	length = strlen(a);
	printf("Length of the string = %d\n", length);
	return 0; 
}

// Calculate Length of String without Using strlen() Function
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;
}