// this code illustrates the difference between the character '0'
// and the character whose ASCII code is 0.

#include <stdio.h>

int main()
{
  char * m = "0";

  printf("the string m is equal to %s\n", m);
  printf("m[0] is the character %c, which has ascii code %d\n", m[0], (int) m[0]);
  printf("m[1] is the character NULL, which has ascii code %d\n", (int) m[1]);
}