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

int strlen(const char * str)
{
  const char *eos = str;
  while( *eos++ ) ;
  return(eos - str - 1);
}

int main()
{
  char str[]="Hello World";
  printf("Length of \"%s\" is %d\n", str, strlen(str));
  return 0;
}