PAT基础编程题目-6-8 简单阶乘计算

题目详情

题目地址：https://pintia.cn/problem-sets/14/problems/740

解答

C语言版

#include <stdio.h>

int Factorial(const int N);

int main()
{
	int N, NF;

	scanf("%d", &N);
	NF = Factorial(N);
	if (NF)  printf("%d! = %d\n", N, NF);
	else printf("Invalid input\n");

	return 0;
}
int Factorial(const int N) {
	int product = 1;
	if (N >= 0) {
		for (int i = 2; i <= N; i++)
			product = product * i;
		return product;
	}
	return 0;
}

C++版

#include<iostream>
using namespace std;
int Factorial(const int N);
int main() {
	int N, NF;

	cin >> N;
	NF = Factorial(N);
	if (NF)  cout << N<<"! = " << NF<<endl;
	else cout << "Invalid input"<<endl;
	return 0;
}
int Factorial(const int N) {
	int product = 1;
	if (N >= 0) {
		for (int i = 2; i <= N; i++)
			product = product * i;
		return product;
	}
	return 0;
}

Java版

public class Main{

	private static int Factorial(final int N) {
		int product = 1;
		if(N>=0) {
			for (int i = 2; i <= N; i++) {
				product = product*i;
			}
			return product;
		}
		return 0;
	}
	public static void main(String[] args) {
		int N=0,NF=0;
		Scanner scanner = new Scanner(System.in);
		if(scanner.hasNext()) {
			N = scanner.nextInt();
		}
		scanner.close();
		NF = Factorial(N);
		if(NF>0)
			System.out.println(N+"!="+NF);
		else {
			System.out.println("Invalid input");
		}

	}

}

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