簡單的控制檯應用程序計算器功能

Question

我測試了一個簡單的計算器函數，作爲我的C＃研究的一部分，並且我遇到了問題，即使我輸入正確的選擇，它也不會退出while循環。 下面是代碼：

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; 
    } 

我不知道爲什麼這樣做，這應該只是罰款。 請幫助我，謝謝！ :)

Answer 1

你可以改變你的循環條件是這樣的：

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

Answer 2

試圖改變你的代碼：的

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

代替：

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

Answer 3

你有sumCalc兩次在while的條件。如果您使用OR作爲條件，即使您輸入sumCalc或multiCalc，也會將||更改爲&&，該循環將爲真，並不斷要求您再次輸入。

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