用面向对象做计算器,TryCatch没做成 - 黑马程序员技术交流社区

<font size="4">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace 用面向对象做计算器
{
class Program
{
//全局变量
public static int numBer1;
public static string sign;
public static int numBer2;
static void Main(string[] args)
{
//用面向对象写计算器
//封装，继承，多态
while (true)
{
try
{
Console.WriteLine("请您输入数字");
numBer1 = Convert.ToInt32(Console.ReadLine()); //第一个数字
}
catch
{
Console.WriteLine("您输入的数字错误,请重新输入");
numBer1 = Convert.ToInt32(Console.ReadLine()); //第一个数字
}
try
{
Console.WriteLine("请您输入字符");
sign = Console.ReadLine(); //字符
}
catch
{
Console.WriteLine("您输入的字符错误,请重新输入");
sign = Console.ReadLine();
}
try
{
Console.WriteLine("请您输入数字");
numBer2 = Convert.ToInt32(Console.ReadLine()); //第二个数字
break;
}
catch
{
Console.WriteLine("您输入的数字错误,请重新输入");
numBer2 = Convert.ToInt32(Console.ReadLine()); //第二个数字
}
}
//继承+方法名一样
Count count = new Count(); //遍历父类
switch (sign)
{
case "+": count = new Add(); //赋值给父类
break;
case "-": count = new Reduce();
break;
case "*": count = new Ride();
break;
case "/": count = new Divide();
break;
}
//Add add = new Add();
//Count count = add;
//计算
int output = 0;
output = count.UseCount(numBer1, numBer2);
Console.WriteLine("{0}{1}{2}={3}", numBer1, sign, numBer2, output);
Console.ReadKey();
}
}
//父类
class Count
{
public virtual int UseCount(int number1, int number2)
{
return 0;
}
}
//加子类
class Add : Count
{
public override int UseCount(int number1, int number2)
{
return (number1 + number2);
}
}
//减子类
class Reduce : Count
{
public override int UseCount(int number1, int number2)
{
return (number1 - number2);
}
}
//乘类
class Ride : Count
{
public override int UseCount(int number1, int number2)
{
return (number1 * number2);
}
}
//除类
class Divide : Count
{
public override int UseCount(int number1, int number2)
{
return (number1 / number2);
}
}
}
</font>

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