在c#中循环时无限
发布时间:2020-12-15 23:45:39 所属栏目:百科 来源:网络整理
导读:我是c#的新手,并且遇到了一个不会中断的while循环问题.它只是一个简单的控制台计算器,如果输入正确,我希望switch语句突破循环并保持循环.问题是它是否保持循环,即使选择了正确的字母,例如A for add,这是我的代码: using System;using System.Collections.Ge
我是c#的新手,并且遇到了一个不会中断的while循环问题.它只是一个简单的控制台计算器,如果输入正确,我希望switch语句突破循环并保持循环.问题是它是否保持循环,即使选择了正确的字母,例如A for add,这是我的代码:
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace basic_calc { class Program { static void Main(string[] args) { Console.WriteLine("this is a basic calculator"); double num1 = Getvalue("Enter the first number: "); double num2 = Getvalue("Enter the second number: "); double output = 0; while (true) { Console.WriteLine(" Please select an operation (A)dd,(S)ubtract,(M)ultiply,(D)ivide"); char operation = Console.ReadKey().KeyChar; operation = Char.ToUpper(operation); switch (operation) { case 'A': output = Add(num1,num2); break; case 'S': output = Subtract(num1,num2); break; case 'M': output = Multiply(num1,num2); break; case 'D': output = Divide(num1,num2); break; default: Console.ForegroundColor = ConsoleColor.Red; Console.WriteLine("INVALID INPUT!!!!!!!!!!!!!!!"); Console.ResetColor(); continue; } } Console.WriteLine("nresult: "+ output); Console.ReadKey(); } private static double Getvalue(string input) { //the value to be returned double value; while (true) { Console.Write(input); string number = Console.ReadLine(); if (double.TryParse(number,out value)) { return value; } else Console.WriteLine("please enter a number for this calculator"); } } private static double Add(double n1,double n2){return n1 + n2;} private static double Subtract(double n1,double n2) { return n1 - n2; } private static double Multiply(double n1,double n2) { return n1 * n2; } private static double Divide(double n1,double n2) { return n1 / n2; } } } 解决方法
只需在切换后添加一个中断:
switch (operation) { case 'A': output = Add(num1,num2); break; case 'S': output = Subtract(num1,num2); break; case 'M': output = Multiply(num1,num2); break; case 'D': output = Divide(num1,num2); break; default: Console.ForegroundColor = ConsoleColor.Red; Console.WriteLine("INVALID INPUT!!!!!!!!!!!!!!!"); Console.ResetColor(); continue; } break; // This will exit the loop when a match is found. 由于如果未找到匹配项,则使用continue,如果找到匹配项,则切换后的中断将退出循环. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |