Question

我已经测试了一个简单的计算器功能作为我的C＃研究的一部分，我遇到了一个问题，即使我键入正确的选择，它也不会退出while循环。这是代码：

static void Main(string[] args)
    {
        string calc, inputX, inputY, inputZ;
        double x, y, z;

        Console.Write("Welcome to the cool calculator. Please choose between sumCalc or multiCalc: ");
        calc = Console.ReadLine();

        while (calc != "sumCalc" || calc != "sumCalc")
        {
            Console.Write("Please type in the right calculator again: ");
            calc = Console.ReadLine();
        }

        if (calc == "sumCalc")
        {
            Console.WriteLine("You are now working with the sumCalc.");
            //Getting user input for the variable 'x'
            Console.WriteLine("Please enter a value for the first number:");
            inputX = Console.ReadLine();
            x = Convert.ToDouble(inputX);
            //Getting user input for the variable 'y'
            Console.WriteLine("Please enter a value for the second number:");
            inputY = Console.ReadLine();
            y = Convert.ToDouble(inputY);
            //Getting user input for the variable 'z'
            Console.WriteLine("Please enter a value for the third number:");
            inputZ = Console.ReadLine();
            z = Convert.ToDouble(inputZ);
            Console.WriteLine("The result is:" + sumCalc(x, y, z));
            Console.ReadKey();
        }
        else if (calc == "multiCalc")
        {
            Console.WriteLine("You are now working with the multiCalc.");
            //Getting user input for the variable 'x'
            Console.WriteLine("Please enter a value for the first number:");
            inputX = Console.ReadLine();
            x = Convert.ToDouble(inputX);
            //Getting user input for the variable 'y'
            Console.WriteLine("Please enter a value for the second number:");
            inputY = Console.ReadLine();
            y = Convert.ToDouble(inputY);
            //Getting user input for the variable 'z'
            Console.WriteLine("Please enter a value for the third number:");
            inputZ = Console.ReadLine();
            z = Convert.ToDouble(inputZ);
            Console.WriteLine("The result is:" + multiCalc(x, y, z));
            Console.ReadKey();
        }
    }

    //This is the multiply calculator function
    static double sumCalc(double x, double y, double z)
    {
        double res = x + y + z;
        return res;
    }

    //This is the multiply calculator function
    static double multiCalc(double x, double y, double z)
    {
        double res = x * y * z;
        return res;
    }

我不知道为什么会这样做，它应该可以正常工作。请帮帮我，谢谢！：）

Answer 1

sumCalc条件下while两次。同时将||更改为&&，如果您使用OR作为条件，即使您输入sumCalc或multiCalc，循环也将为真，并继续询问你再次进入。

while (calc != "sumCalc" && calc != "multiCalc")

Answer 2

尝试更改代码：

while (calc != "sumCalc" && calc != "multiCalc")

而不是：

while (calc != "sumCalc" || calc != "sumCalc")

Answer 3

您可以将循环条件更改为：

while (calc != "sumCalc" || calc != "multiCalc")

简易控制台应用程序计算器

3 个答案: