#include <stdio.h>

void printstring(char *p)
{
  while (*p)
    putchar(*p++);
}

int main(void)
{
  char x[] = "Hello?\n\0s there anybody in there?\n";

  printstring(x);
  printstring(x);
  x[7] = 'I';
  printstring(x);
  printstring("Just nod if you can hear me.\n");
  return 0;
}