#include <stdio.h>

/* Program from 'The C programming language' by
   Kernighan and Ritchie. */

#define STR1 "monkey"
#define STR2 "programming in C"

int my_strlen(char *s){
  char *p = s;

  while (*p != '\0')
    p++;

  return p-s;
}

int main(void) {

  printf("Length of \"%s\" = %i\n", STR1, my_strlen(STR1));
  printf("Length of \"%s\" = %i\n", STR2, my_strlen(STR2));
  
  return 0;
}