برنامه اي ساده كه عددي را گرفته و فاكتوريل آنرا چاپ مي نمايد.
#include <stdio.h>
#include <conio.h>
/* A program to calculate the Factorial for a given number.
By Morteza Zafari */
long int fact(int);
void main()
{
int num;
clrscr();
printf(".:::: this program will calculate the Factorial for a given number ::::.");
printf("\n\n Please input a number to calculate the Factorial: ");
scanf("%d",&num);
if (num<0 ) printf("\n Negative numbers don't have Factorial");
else printf("\n The Factorial for %d is %ld\n",num,fact(num));
getch();
}
long int fact (int n)
{
if (n!=0 && n!=1) return(n*fact(n-1));
else return(1);
}
