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我正在开发一个 C# 应用程序，该应用程序应该输入每罐汽油的行驶里程和使用的加仑数（整数），然后应用程序应该计算并显示每罐汽油获得的每加仑英里数，并显示获得的每加仑英里数所有的坦克。我的问题是哨兵控制的方面“-1”不会停止程序运行，但是，IDE 会启动一个 JIT 调试器，我得到一个 Microsoft.NET 框架异常 MileageDriven.exe [732]。

我可以得到一些帮助，因为我不想超越这个练习，因为未来的课程建立在上一课的基础上。提前致谢。:)

using System;

public class MileagedrivenTest
{
   public static void Main(string[] args)
   {
      Mileage driverMileage = new Mileage("Driver log");

      driverMileage.DisplayMessage();
      driverMileage.DetermineMileagePerGallon();
   } // end main
} // end class MileageDrivenTest

// Fig. 1.1: MileageDriven.cs
// Mileage class that solves mileage per gallon problem
// using sentinel-controlled repetition
using System;

public class Mileage
{
   public string Gallons { get; set; }

   public Mileage (string name)
   {
      Gallons = name;
   }

   public void DisplayMessage()
   {
      Console.WriteLine("Welcome to the mileage log for\n{0}\n", Gallons);
   } // end method DisplayMessage

   //determine the average mileage for gallon per tank of gas
   public void DetermineMileagePerGallon()
   {
      int total = 0;
      int mileage; // sum of miles driven
      int gallons; // sum gallons used
      double average;

      int mileageCounter = 0;

      Console.WriteLine("Enter mileage or -1 to quit: ");
      mileage = Convert.ToInt32(Console.ReadLine());
      Console.WriteLine("Enter gallons used: ");
      gallons = Convert.ToInt32(Console.ReadLine());

      while (mileage != -1)
      {
         mileage = total + mileage;
         mileageCounter = mileageCounter + mileage;

         Console.Write("Enter next miles driven or -1 to quit: ");
         mileage = Convert.ToInt32(Console.ReadLine());         
      } // end while

      if (mileageCounter != 0)
      {
         average = (double)total / mileageCounter;

         Console.WriteLine("\nTotal of the {0} miles driven is {1} per tank is{}", mileageCounter, total);
         Console.WriteLine("Average mile per gallon is {0}", average);
      }
      else
         Console.WriteLine("No mileage entered");      
   }
}
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1 回答 1

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您发布的代码在此行引发异常：

Console.WriteLine("\nTotal of the {0} miles driven is {1} per tank is{}", mileageCounter, total);

问题是额外的{}。如果您删除该代码将运行，但我认为它不能解决您要解决的问题。我已经根据我对问题的解释修改了DetermineMileagePerGallon() - 希望它能让你更接近解决方案：

 //determine the average mileage for gallon per tank of gas
   public void DetermineMileagePerGallon()
   {
       int totalTankfuls = 0;
       int inputMileage;
       int totalMileage = 0; // sum of miles driven
       int totalGallons = 0; // sum gallons used

       Console.WriteLine("Enter mileage or -1 to quit: ");
       while (!Int32.TryParse(Console.ReadLine(), out inputMileage)) ;

       while (inputMileage != -1)
       {
           totalTankfuls++;

           if (inputMileage > 0)
               totalMileage += inputMileage;

           Console.WriteLine("Enter gallons used: ");
           int inputGallons;
           while (!Int32.TryParse(Console.ReadLine(), out inputGallons)) ;

           if (inputGallons > 0)
               totalGallons += inputGallons;

           Console.WriteLine("Enter mileage or -1 to quit: ");
           while (!Int32.TryParse(Console.ReadLine(), out inputMileage)) ;

       } // end while

       if (totalTankfuls > 0)
       {
           double averageMpg = (double)totalMileage / totalGallons;

           double averageMileagePerTankful = (double)totalMileage / totalTankfuls;
           Console.WriteLine("Total of {0} miles driven on {1} tanks of fuel; average is {2} miles per tankful", totalMileage, totalTankfuls, averageMileagePerTankful);
           Console.WriteLine("Average mile per gallon across all tankfuls is {0}", averageMpg);
       }
       else
           Console.WriteLine("No mileage entered");
   }
于 2012-03-29T10:13:48.040 回答