#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(void)
{int fd[2];
 pid_t x;
 char S[100];
 pipe(fd);
 x = fork();
 if (x == 0)
 { printf("Child Process<%d> Send Hello to Father Process!\n", getpid());
   sleep(1);
   sprintf(S, "Hello from Child Process!");
   close(fd[0]);
   write(fd[1], S, 50);
   close(fd[1]);
   sleep(1);
 }
  else 
  {//wait(0);
   close(fd[1]);
   read(fd[0], S, 50);
   close(fd[0]);
   printf("Father Process<%d> receive the message : ** %s **\n", getpid(), S);
  }
 return 0;	
}