Find the length of a string with C. 

#include <stdio.h>
#include <string.h>

int main()
{
    char text[100]; /* Declares a string of size 100 */
    int length;

    printf("Enter any string: ");
    gets(text);

    /* Call strlen() function to count length of string */
    length = strlen(text);

    printf("Length of '%s' = %d", text, length);
    return 0;
}

Output

Enter any string : Rezaul
Length of 'Rezaul' = 6