#include <iostream>

int strlen(const char *s)    // computes length of string s
{   const char *t = s;
    while( *t++ != '\0' ) {} // go to end of string
    return(t - s - 1);       // length of string without terminator
}

int main()
{   std::cout << strlen("abcde") << std::endl;
    return 0;
}