#include<string.h>
main()
{
    char s[50];
    int i=0;
    printf("enter a string\n");
    gets(s);
    while(s[i]!='\0')
    {
        i++;
    }

    printf("The length of the given string is %d",i);
}
     
           
Note: Need to be arranged in compiler after copied
   

 OutPut:

enter a string Hello World The length of the given string is 11