fact.cpp

来自「some useful programs and simple yet」· C++ 代码 · 共 22 行

#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);
	}