Find the factorial using PIPES in C

By Sidharth Patnaik -
This is a simple program in C which uses the pipes to find the factorial of a number. Initially the Child get the number from the user and performs the factorial operation. After performing the factorial operation it writes and gets closed. Now the parent extracts the stored data and displays it in the console.

Screenshots[Demo]



The Code:
#include<stdio.h>
#include<stdlib.h>
#include<sys/wait.h>
#include<unistd.h>
int main()
{
 int pfds[2];
 int n,f=1,i,n1;
 pipe(pfds);
 if(!fork())
 {
  printf("Child: Writing to the PIpe \n");
  printf("Child: Enter the NUmber:");
  scanf("%d",&n);
  for(i=1;i<=n;i++)
   f=f*i;
  write(pfds[1],(char *)&f,sizeof(f));
  close(pfds[1]);
  printf("Child: Exiting\n");
 }
 else
 {
  wait(0);
  printf("Parent: reaading from pipe\n");
  read(pfds[0],&n1,sizeof(int));
  printf("Parent : Read %d\n",n1);
  sleep(1);
  close(pfds[0]);
 }
 return 0;
}

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