雖然循環沒有退出

我的程序應該計算每加侖行程里程。雖然循環沒有退出

該程序運行良好，直到我嘗試退出，當我在循環內。當用戶在三個輸入中的任何一點輸入「quit」但它只是進入下一個輸入時應該退出。即使我在所有三個輸入中都輸入了quit，它只會崩潰。

事情我已經嘗試：

所有輸入三個輸入
退出僅使用1條件的循環，而不是三個
把strBeginningOdometerReading.ToUpper（）= 1-10000000
更改所有的||到& &
更改退出到一個字符串變量

using System; 

namespace MPG 
{ 
    class Program 
    { 
     static void Main() 
     { 
      //Declare the variables 
      string strBeginningOdometerReading, strEndingOdometerReading, strNumberOfGallons; 
      double dblBeginningOdometerReading, dblEndingOdometerReading, dblNumberOfGallons, dblMilesPerGallon, dblMilesTravelled; 

      //Priming prompt & read 
      Console.Write("Enter the beginning odometer reading: "); 
      strBeginningOdometerReading = Console.ReadLine(); 
      Console.Write("Enter the ending odometer reading: "); 
      strEndingOdometerReading = Console.ReadLine(); 
      Console.Write("Enter the number of gallons purchased for six fill-ups during the trip."); 
      strNumberOfGallons = Console.ReadLine(); 

      //Convert 
      dblBeginningOdometerReading = Convert.ToDouble(strBeginningOdometerReading); 
      dblEndingOdometerReading = Convert.ToDouble(strEndingOdometerReading); 
      dblNumberOfGallons = Convert.ToDouble(strNumberOfGallons); 

      //Calculations 
      dblMilesTravelled = dblEndingOdometerReading - dblBeginningOdometerReading; 
      dblMilesPerGallon = dblMilesTravelled/dblNumberOfGallons; 

      //Display 
      Console.WriteLine("Miles Travelled: \t\t\t {0:n2} miles", dblMilesTravelled); 
      Console.WriteLine("Number of Gallons Purchased for 6 fill-ups: {0:n2} gallons", dblNumberOfGallons); 
      Console.WriteLine("Miles per Gallon (MPG): \t\t\t {0:n2} mpg", dblMilesPerGallon); 

      //While loop 
      while (strBeginningOdometerReading.ToUpper() != "QUIT" || strEndingOdometerReading.ToUpper() != "QUIT" || strNumberOfGallons.ToUpper() != "QUIT") 
      { 

       Console.WriteLine("Enter QUIT at any time to exit."); 
       Console.Write("Enter the beginning odometer reading: "); 
       strBeginningOdometerReading = Console.ReadLine(); 
       Console.Write("Enter the ending odometer reading: "); 
       strEndingOdometerReading = Console.ReadLine(); 
       Console.Write("Enter the number of gallons purchased for six fill-ups during the trip: "); 
       strNumberOfGallons = Console.ReadLine(); 

       //Convert 
       dblBeginningOdometerReading = Convert.ToDouble(strBeginningOdometerReading); 
       dblEndingOdometerReading = Convert.ToDouble(strEndingOdometerReading); 
       dblNumberOfGallons = Convert.ToDouble(strNumberOfGallons); 

       //Calculations 
       dblMilesTravelled = dblEndingOdometerReading - dblBeginningOdometerReading; 
       dblMilesPerGallon = dblMilesTravelled/dblNumberOfGallons; 

       //Display 
       Console.WriteLine("Miles Travelled: \t\t\t {0:n2} miles", dblMilesTravelled); 
       Console.WriteLine("Number of Gallons Purchased for 6 fill-ups: {0:n2} gallons", dblNumberOfGallons); 
       Console.WriteLine("Miles per Gallon (MPG): \t\t\t {0:n2} mpg", dblMilesPerGallon); 
      } // end while 
     } //end Main 
    } //end class 
} //end namespace

來源

2016-10-04 Ryker

感謝所有幫助每個人！ – Ryker

你而條件應該和

(strBeginningOdometerReading.ToUpper() != "QUIT" && strEndingOdometerReading.ToUpper() != "QUIT" && strNumberOfGallons.ToUpper() != "QUIT")

來源

2016-10-04 04:33:37 CriPstian

的strBeginningOdometerReading = Console.ReadLine();是while循環裏面，所以我們期待代碼的其餘部分直到下一個循環才執行。

你也許可以在strBeginningOdometerReading = Console.ReadLine();之後加上if(strBeginningOdometerReading.ToUpper() =="QUIT") break;來跳出while循環並停止執行其餘的代碼。

並改爲while(true)，你會沒事的。

來源

2016-10-04 04:35:00 deviantxdes

雖然循環沒有退出

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