Program to demonstrate Inter-Process Communication (IPC) between parent and child

/* Program to demonstrate Inter-Process Communication (IPC) between parent and child using pipe system call.
*/

#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<sys/ipc.h>
#include<sys/uio.h>
#include<sys/types.h>
main()
{
int pid,pfd[2],n,a,b,c;
if(pipe(pfd)==-1)
{
printf("\nError in pipe connection\n");
exit(1);
}
pid=fork();
if(pid>0)
{
printf("\nParent Process");
printf("\nFibonacci Series");
printf("\nEnter the limit for the series:");
scanf("%d",&n);
close(pfd[0]);
write(pfd[1],&n,sizeof(n));
close(pfd[1]);
exit(0);
}
else
{
close(pfd[1]);
read(pfd[0],&n,sizeof(n));
printf("\nChild Process");
a=0;
b=1;
close(pfd[0]);
printf("\nFibonacci Series is:");
printf("\n\n%d\n%d",a,b);
while(n>1)
{
c=a+b;
printf("\n%d",c);
a=b;
b=c;
n--;
}
}
}

OUTPUT SCREEN: