用 C# 构建简单的计算器

Question

我正在尝试在 C# 上构建一个非常简单的计算器，我想将结果存储在变量“result”中并通过 Console.WriteLine(result) 显示它。出于某种原因 Console.WriteLine(result) 是不允许的。

using System;

namespace Giraffe
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("insert number1");
            double num1 = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("insert operator");
            string op = Console.ReadLine();

            Console.WriteLine("insert number2");
            double num2 = Convert.ToDouble(Console.ReadLine());
         
            if (op == "+")
            {
                double result = num1 + num2;
            }

            else if(op == "-")
            {
                double result = num1 - num2;
            }

            else if (op == "*")
            {
                double result = num1 * num2;
            }

            else if (op == "/")
            {
                double result = num1 / num2;
            }


            Console.WriteLine(result);


        }
     
    }
}

非常感谢

Answer 1

在 if 语句外声明 double result

static void Main(string[] args)
    {

        Console.WriteLine("insert number1");
        double num1 = Convert.ToDouble(Console.ReadLine());

        Console.WriteLine("insert operator");
        string op = Console.ReadLine();

        Console.WriteLine("insert number2");
        double num2 = Convert.ToDouble(Console.ReadLine());

        double result = 0;

        if (op == "+")
            result = num1 + num2;
        else if (op == "-")
            result = num1 - num2;
        else if (op == "*")
            result = num1 * num2;
        else if (op == "/")
            result = num1 / num2;
        Console.WriteLine(result);
    }

用 C# 构建简单的计算器

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