#include <stdio.h>

int strlen1(char *);  /* strdup1 and strlen1 to be */
void main(void)
{
   char s[] = "Rats&roaches";
   printf("%i\n", strlen1(s));
}

int strlen1(char *s)
{
   if (*s == '\0') return 0;
   return strlen1(++s) + 1;
}