exp3fork1.c

#include<stdio.h>
#include<unistd.h>
int main()
{
        int x;
        x =  fork();
        if(x==0)
        {
                printf("C1 PID = %d Parent = %d\n ", getpid(), getppid());
                x = fork();
                if(x==0)
                {
                        printf("C3 PID = %d Parent = %d\n", getpid(), getppid());
                }
                else if(x>0)
                {
                        x = fork();
                        if(x==0)
                        {
                                printf("C4 PID = %d Parent = %d\n", getpid() , getppid());
                        }
                }
        }
         else if(x>0)
        {
                printf("P PID = %d\n ", getpid());
                x =fork();
                if(x==0)
                {
                        printf("C2 PID = %d Parent = %d\n", getpid(), getppid());
                }
        }
return 0;
}