Question

如何使用C#编程语言，计算某开始日期和结束日期,当月有效天数?

如何使用C#编程语言，计算某开始日期和结束日期,当月有效天数?
例：开始日期：2019-11-12，结束日期：2019-12-25，怎么计算12月份有效天数？

Answer 1

实际上本题目根本用不着虚方法或者是抽象类的，如果你强行规定，只能这样了：using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 {abstract class Algorithm {public int Number1 { get; set; } public int Number2 { get; set; } public Algorithm(int number1,int number2) {Number1 = number1;Number2 = number2;}public abstract double Execute(string oper); }class Program:Algorithm {static void Main(string[] args) {Console.WriteLine("输入第一个数："); int n1 =Convert.ToInt32(Console.ReadLine()); Console.WriteLine("输入第二个数："); int n2 = Convert.ToInt32(Console.ReadLine()); Program p = new Program(n1,n2); Console.WriteLine("结果是："+p.Execute("+")); }public Program(int n1,int n2):base(n1,n2) {}public override double Execute(string oper) {if (oper == "+") {return Number1 + Number2; }else if (oper == "-") {return Number1 - Number2; }else if (oper == "*") {return Number1 *Number2; }else if (oper == "/" && Number1!=0) {return Number1 /Number2; }return 0; }}}

Answer 2

首先，什么才算有效天数？