#include<stdio.h>
#include<conio.h>
int fact(int);
void main()
{
int n,x;
clrscr();
printf("enter the value of n");
scanf("%d",&n);
printf("factorial is %d",fact(n));
getch();
}

int fact(int n)
{
if(n==0||n==1) return 1;
else return n*fact(n-1);
}