C#计算阶乘 [英] C# to calculate factorial

问题描述

我有这段代码可以从用户那里获得输入，并计算出小于输入数字的阶乘和阶乘，但是我一直只获取第一个数字的阶乘，其余为0.应该像这样:例如，如果输入为5:

I have this code that gets an input from the user and calculate its factorial and the factorial for less than the input number, but I keep getting the factorial for the first number only and the rest is 0. It should be like this: For example, if the input is 5:

5！= 120

4！= 24

3！= 6

2！= 4

1！= 1

我如何让循环抛出所有输入数字以下的数字?

How do I make the loop go throw all the numbers below the input number?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace multiple_factorials
{
    class Program
    {
        static void Main(string[] args)
        {
            int num, n;

            Console.WriteLine(".....................[Application 1].....................\n\n");
            Console.WriteLine("Please enter a number to get its factorial: ");
            num = Convert.ToInt32(Console.ReadLine());

            n = num; // Assign n to num

            while (num > 0)
            {
                for (int i = n - 1; i > 0; i--)
                {
                   n *= i;
                }
                Console.WriteLine("Factorial of {0}! = {1}\n", num, n);
                num--;
            }
        }
    }
}

推荐答案

只需在 while 循环内移动 n = num; :

while (num > 0)
{
    n = num;
    for (int i = n - 1; i > 0; i--)
    {
        n *= i;
    }
    Console.WriteLine("Factorial of {0}! = {1}\n", num, n);
    num--;
}

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