exe3.cpp

来自「本压缩软件为《Visual C++6.0基础教程》（黑魔方系列）一书的源代码」· C++ 代码 · 共 24 行

// Exe3.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream.h>
int fac(int n)
{
	int y;
	if(n<0)
		cout<<"请输入一个大于0的数！"<<endl;
	else if(n==0||n==1)
		y=1;
	else y=fac(n-1)*n;
	return y;
}
void main()
{
	int n,y;
	cout<<"Please input a number!"<<endl;
	cin>>n;
	y=fac(n);
	cout<<n<<"!"<<"="<<y<<endl;
}