Question

好的，此刻我自己是编程新手并慢慢学习。目前我正在学习编程课程以帮助更好地理解编程。我遇到了一个困扰我的问题。

现在虽然我可以用与我提供的相比不同的方式和方式完成作业。我的问题是，为什么会发生这种情况？我没有得到任何错误，所以，唯一发生的事情是在输入控制台Fezzes之后。我想知道我做错了什么。

static void Main(string[] args)
{

    double[] Population = new double[6];
    string[] Years = { "2", "3", "4", "5", "6", "7" };
    double GrowthPercentage = 0.0;
    double MathPercentage = 0.0000;
    double ActualGrowth = 0.0;
    int WhileCounter = 0;

    //Ask user for Population of Roarkville
    Console.WriteLine("Enter the Population of RoarkVille: ");
    //Read Population and store
    Population[0] = Convert.ToDouble(Console.ReadLine());
    //Ask user for Growth percentage
    Console.WriteLine("Enter the Growth percentage ");
    //Read Growth Percentage
    GrowthPercentage = Convert.ToDouble(Console.ReadLine());
    //Calculation of Growth Percentage: Growth Percentage/100 = Math Percentage 
    MathPercentage = GrowthPercentage / 100;
    //ActualGrowth = Population * Math Percentage 

    //Population2 = ActualGrowth + Population 

    while (WhileCounter < 5)
    {
       ActualGrowth = Population[WhileCounter] + MathPercentage;

       WhileCounter++;

       Population[WhileCounter] = ActualGrowth + Population[WhileCounter--];
    }

    for (int i = 0; i < Population.Length; i++)
    {
        Console.WriteLine("Population of 201{0:d}", Years[i]);
        Console.WriteLine(Population[i]);
    }
    //Display 2012 Population 

    //Display 2013 Population 

    //Display 2014 Population 

    //Display 2015 Population 

    //Display 2016 Population 

    //Display 2017 Population

    Console.ReadLine();
}

Answer 1

所以当您使用此代码输入增长百分比时会发生什么：

    while (Counter < 5)
    {
    ActualGrowth = Population[Counter] + MathPercentage;

    Counter++;

    Population[Counter] = ActualGrowth + Population[Counter--];
    }

    for (int i = 0; i < Population.Length; i++)
    {
    Console.WriteLine("Population of 201{0:d}", Years[i]);
    Console.WriteLine(Population[i]);
    }

您输入的数字在增长百分比上将是无限的：

这个也可以帮助你

    while (Counter < 5)
    {
    ActualGrowth = Population[Counter] + MathPercentage;

    Counter++;

    Population[Counter] = ActualGrowth + Population[Counter-1];
    }

    for (int i = 0; i < Population.Length; i++)
    {
    Console.WriteLine("Population of 201{0:d}", Years[i]);
    Console.WriteLine(Population[i]);
    }

Answer 2

++运算符会更改变量的实际值，因此WhileCounter++会将变量增加1

- 运算符执行相同操作，这不是您想要在行

中执行的操作

Population[WhileCounter] = ActualGrowth + Population[WhileCounter--];

相反，请使用WhileCounter - 1，如此

Population[WhileCounter] = ActualGrowth + Population[WhileCounter - 1];

Answer 3

WhileCounter++;

Population[WhileCounter] = ActualGrowth + Population[WhileCounter--];

就循环而言，WhileCounter的值永远不会改变。在循环体中，您递增WhileCounter并继续立即递减它，因此条件WhileCounter < 5始终为真。

你也可以写

int WhileCounter = 0;
while(WhileCounter < 5)  
{
    WhileCounter += 1;  // WhileCounter == 1
    WhileCounter -= 1;  // WhileCounter == 0
}

// aint never gunna happen

Answer 4

您应该阅读以下操作符并了解它们实际执行的操作：

--

++

控制台应用程序，应用程序冻结没有错误

4 个答案: