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Questions about C: please be more detailed about C programming program

2022-02-04 16:34:31 【CSDN Q & A】

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C＃ Programming questions, please be more detailed , beginner , thank you



Take the answer ：
using System;namespace ConsoleApp1{    class Program    {       static long fac(int n)// Calculation n The factorial  {            return n == 0 ? n * fac(n - 1) : 1;// Such as n by 0 or 1 The return value is 1, If not 0,1 Then return to n*(n-1)!        }        static void Main(string[] args) {            Console.WriteLine(" Input n Value :");            int n = int.Parse(Console.ReadLine());            long e = 0;            for (int i = 0; i <= n; i++)            {                e = e + 1 / fac(n);//  Calculated value e = 1/0!+1/1!+1/2!+......+1/n!            }            Console.WriteLine("e Value :"+e.ToString());        }    }}

Other answers 2：

First use a function to calculate the factorial .
Then find its reciprocal .
Sum up .


Other answers 3：

You can use the idea of recursion to calculate

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