(1) 选择3时的运行结果： (2) 选择5时的运行结果： The result is 16 Invalid Option

从键盘输入的8和two时（第二个数为非整数），程序运行结果： 程序不运行

4.在保持功能不变的情况下，改写上例代码如下： using System;

class CalcNumber { int number1,number2; char option; public void GetNumber()

{ Console.WriteLine(“Enter the First Number:”); number1=Convert.ToInt32(Console.ReadLine()); Console.WriteLine(“Enter the Second Number:”); number2=Convert.ToInt32(Console.ReadLine()); }

public void GetOption() { Console.WriteLine(“Main Menu”); Console.WriteLine(“1.Addition”);

Console.WriteLine(“2.Subtraction”); Console.WriteLine(“3.Multiplication”); Console.WriteLine(“4.Division”);

Console.WriteLine(“Enter the Operation you want to perform:”); option = Convert.ToChar(Console.ReadLine()); }

public int Compute() {

int result;