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

main()
{ int pid;
  printf("Single\n");
  pid = fork();
  if (pid == -1)
  { perror("fork failed");
    exit(-1);
  }
  else if (pid == 0)
  { printf("  Child process\n");
  }
  else
  { printf("Parent process\n");
  }
}