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

int main(){
  
  int pipefd1[2]; //msg from parent to child
  int pipefd2[2];  //msg from child to child1
  
  char write_msg1[100];
  char write_msg2[100];
  char read_msg1[100];
  char read_msg2[100];
  
  
  if(pipe(pipefd1)==-1){printf("error"); return 1;}
  if(pipe(pipefd2)==-1){printf("error"); return 1;}

   printf("Enter the msg sent from parent to child:");
   scanf("%s",write_msg1);
   printf("Enter the msg sent from child to child1:");
   scanf("%s",write_msg2);
  
  
  pid_t pid_child;
  pid_child = fork();
  
  if(pid_child<0){printf("ERROR IN CHILD\n");return 1;}
  else if (pid_child==0){
    printf("WE ARE IN CHILD \n");
    
    
    close(pipefd1[1]); // close writing
    read(pipefd1[0],read_msg1,sizeof(read_msg1));
    printf("THE MSG FROM PARENT IS :%s \n", read_msg1);
    close(pipefd1[0]);
    
    
    close(pipefd2[0]);
    write(pipefd2[1],write_msg2,strlen(write_msg2)+1);
    printf("MSG SENT TO CHILD1 IS :%s \n", write_msg2);
    close(pipefd2[1]);
    
    
     pid_t pid_child1;
     pid_child1 = fork();
     
     if(pid_child1<0){printf("ERROR IN CHILD1\n");return 1;}
     else if (pid_child1==0){
       printf("WE ARE IN CHILD 1");
       
       
       close(pipefd2[1]); // close writing
       read(pipefd2[0],read_msg2,sizeof(read_msg2));
       printf("THE MSG FROM CHILD IS :%s \n", read_msg2);
       close(pipefd2[0]);
    
       
     }else { wait(NULL); }
     
     
     
  }else {
    
    printf("WE ARE IN PARENT\n");
    
    
    close(pipefd1[0]);
    write(pipefd1[1],write_msg1,strlen(write_msg1)+1);
    printf("MSG SENT TO CHILD IS :%s \n", write_msg1);
    close(pipefd1[1]);
    
    wait(NULL);
    
  }
  
  
  return 0;
}