13i.cpp

C/C++程序设计导论（第二版）》程序源文件

#include <iostream.h>

// Fact()  Return the factorial of parameter n
//  IN:  n is a positive integer number
int Fact (int n)
{	int temp;
	if (n <= 1) 			// trivial case
	temp = 1;
	else
		temp = n * Fact(n-1);	// recursive case
	return (temp);
}

void main ()
 { int x;
	cout << "enter a value: ";
	cin >> x;
	cout << "factorial is: " << Fact(x) << endl;
 }