Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Assignment2
{
class Program
{
    static void Main(string[] args)
    {
        int Value1,Value2,result,a;

        Console.Write("Enter Value 1: ");
        Value1 = Convert.ToInt32(Console.ReadLine());

        Console.Write("Enter Value 2: ");
        Value2 = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Choose an arithmetic operator:");


        Console.WriteLine("\t1. +(add)");
        Console.WriteLine("\t2. -(subtract)");
        Console.WriteLine("\t3. *(multiply)");
        Console.WriteLine("\t4. /(divide)");
        Console.Write("\t5. %(mod)");

        Console.Write("\n\n");

        a = Convert.ToInt32(Console.ReadLine());

        switch (a)
        {
            case"1":
                Console.WriteLine("Operator is: Add");
                result=Value1+Value2;
                Console.WriteLine("Result: "+result);
                break;

            case"2":
                Console.WriteLine("Operator is: Subtract");
                result=Value1-Value2;
                Console.WriteLine("Result: "+result);
                break;

            case"3":
                Console.WriteLine("Operator is: Multiply");
                result=Value1*Value2;
                Console.WriteLine("Result: "+result);
                break;

            case"4":
                Console.WriteLine("Operator is: devide");
                result=Value1/Value2;
                Console.WriteLine("Result: "+result);
                break;

            case"5":
                Console.WriteLine("Operator is: mod");
                result = Value1 % Value2;
                Console.WriteLine("Result: "+result);
                break;
        }
    }
}
}

我有基本的C＃，我尝试制作一个可以使用Case语句运行5次算术运算的程序，在我完成编码后...发现了5个错误让我卡住了...输出总是带有2个结果（即我选择Add ..并且会出现2输出，它会同时加减。有人帮我这个吗？

Answer 1

违规代码是您的案例陈述。 a是int。您的案例陈述都使用string s。只需删除数字周围的引号：

switch(a)
{
    case 1: 
            // some code
            break;
    case 2: 
            // some code
            break;
    // rest of cases
}

Answer 2

您正在将a转换为int，但您的switch语句将其与字符串匹配。将其更改为case 1:而不是case "1"以解决问题。

Answer 3

删除引号以防万一。即。

将case "1":替换为case 1:

无法将类型'string'隐式转换为'int'错误

3 个答案: