#include <stdio.h>
#include <string.h>

int main() {
   int pipes[2];
   int messagelen = 22;
   char data[50];
   int childPID;
   int value, value2;
 
   srand(time(0));   
   pipe(pipes);
   childPID = fork();
   if(childPID != 0) {
// remember - if fork returns a non-zero value, this is the parent
   value = 20;
   value2 = 100;
   strcpy(data, "Go clean your room! from Parent");
   messagelen = strlen(data);
   write(pipes[1], &value, sizeof(int));
   write(pipes[1], &value2, sizeof(int));
   wait(-1);
   read(pipes[0], &value, sizeof(int));
   printf("Parent received %d\n", value);
   }
   else {
      read(pipes[0], &value, sizeof(int));
      read(pipes[0], &value2, sizeof(int));
 
      printf("Child %d value1= %d, value2 = %d\n", getpid(), value, value2);
      value = rand()%100;
      printf("Child sending %d to parent\n", value);
      write(pipes[1], &value, sizeof(int));
   }
}

/*

gcc -o fork3 fork3.c

./fork3
Child 18988 value1= 20, value2 = 100
Child sending 54 to parent
Parent received 54

*/