阶乘的递归 c代码

#include <stdio.h>
#include <string.h>
#include <time.h>
#include <windows.h>


long GetCPUTime()
{
	static LARGE_INTEGER li = {0};
	LARGE_INTEGER linow = {0};
	if (li.QuadPart == 0)
		QueryPerformanceFrequency(&li);
	QueryPerformanceCounter(&linow);
	return linow.QuadPart * 10000 / li.QuadPart;
}

#ifdef __TURBOC__ 
#define get_clock_ticks(x) x=biostime(0,0L)
#else
#define get_clock_ticks(x) \
	x = GetCPUTime()
#endif

double Factorial(int);

int main(int argc, char const *argv[])
{
	int n;
	double result;
	long double start;
	long double end;
	long double time;
	while(1){
		printf("please input your number >0 ...\n");
		scanf("%d", &n);
		get_clock_ticks (start);
		result = Factorial(n);
		get_clock_ticks (end);
		time = end - start;
		printf("the result is %d! =: %f\n", n,result);
		printf("spend times =: %Lf\n", time);
	}
	getchar();
	return 0;
}

double Factorial(int n){
	if (n == 1)
		return 1;
	else
		return n*Factorial(n-1);
}