计算错误的平均值

Question

到目前为止，这是我的代码。我从 txt 文件中提取数据并写入具有平均年龄和经验的新文件。我没有得到正确的平均值。我的错在哪里？

class Program
{
    static int age, exp, id, ageSum = 0, expSum = 0, empSum = 0;
    static double avgAge, avgExp;
    static char type;
    const string INPUT_FILE_NAME =
    "\\Users\\Jon.Jon-PC\\Documents\\Visual Studio 2015\\Projects\\ConsoleApplication9\\ConsoleApplication9\\data.txt";
    const string OUTPUT_FILE_NAME =
    "\\Users\\Jon.Jon-PC\\Documents\\Visual Studio 2015\\Projects\\ConsoleApplication9\\ConsoleApplication9\\dataout.txt";
    static StreamReader fileIn;
    static StreamWriter fileOut;
    static string lineIn, eligibility;


    static void OpenFiles()
    {
        if (File.Exists(INPUT_FILE_NAME))
        {
            fileIn = File.OpenText(INPUT_FILE_NAME);
            Console.WriteLine("{0} was opened", INPUT_FILE_NAME);
        }
        else
        {
            Console.WriteLine("Error: {0} does not exit\n",
           INPUT_FILE_NAME);
            Environment.Exit(0);
        }
        fileOut = File.CreateText(OUTPUT_FILE_NAME);
        if (File.Exists(OUTPUT_FILE_NAME))
            Console.WriteLine("{0} was created\n",
          OUTPUT_FILE_NAME);
        else
        {
            Console.WriteLine("Error: {0} could not be created\n",
          OUTPUT_FILE_NAME);

            Environment.Exit(0);
        }
    }

    static void ParseLineIn()
    {
        string[] words = new string[4];

        lineIn = lineIn.Trim();
        while (Regex.IsMatch(lineIn, "[ ]{2}"))
            lineIn = lineIn.Replace("  ", " ");
        words = lineIn.Split(' ');
        id = int.Parse(words[0]);
        type = char.Parse(words[1]);
        age = int.Parse(words[2]);
        exp = int.Parse(words[3]);
    }

    static void UpdateTotals()
    {
        empSum++;
        ageSum += age;
        expSum += exp;
    }

    static void CalcAvg()
    {
        avgAge = ageSum / empSum;
        avgExp = expSum / empSum;
    }

    static void PrintAvg()
    {
        fileOut.Write("Avg\t  {0}  {1}", avgAge, avgExp);
    }

    static void CalcRetirement()
    {
        switch (type)
        {
            case 'm':
            case 'M':

                if (age < 55 && exp < 20)
                    eligibility = ("lack of experience age");
                else if (age >= 55 && exp >= 20)
                    eligibility = ("can retire");
                else if (age >= 55 && exp < 20)
                    eligibility = ("lack of experience");
                else if (age < 55 && exp >= 20)
                    eligibility = ("underage");
                else
                    eligibility = ("Your entry is invalid");
                break;

            case 'w':
            case 'W':

                if (age < 63 && exp < 25)
                    eligibility = ("lack of exp age");
                else if (age >= 63 && exp >= 25)
                    eligibility = ("can retire");
                else if (age >= 63 && exp < 25)
                    eligibility = ("lack of exp");
                else if (age < 63 && exp >= 25)
                    eligibility = ("lack age");
                else
                    eligibility = ("Your entry is invalid");
                break;

            case 's':
            case 'S':

                if (age < 60 && exp < 24)
                    eligibility = ("lack of exp age");
                else if (age >= 60 && exp >= 24)
                    eligibility = ("can retire");
                else if (age >= 60 && exp < 24)
                    eligibility = ("lack of exp");
                else if (age < 60 && exp >= 24)
                    eligibility = ("underage");
                else
                    eligibility = ("Your entry is invalid");
                break;
        }
    }

    static void CloseFiles()
    {
        fileIn.Close(); fileOut.Close();
    }


    static void PrintReportHeadings()
    {
        fileOut.WriteLine("          Employee Report               ");
        fileOut.WriteLine();
        fileOut.WriteLine(" ID  Age Exp Eligibility ");
        fileOut.WriteLine("---- --- --- ----------- ");
    }

    static void printDetailLine()
    {
        fileOut.WriteLine("{0}  {1}  {2} {3}", id, age, exp, eligibility);
    }

    static void Main(string[] args)
    {
        OpenFiles();
        PrintReportHeadings();
        while ((lineIn = fileIn.ReadLine()) != null)
        {
            UpdateTotals();
            ParseLineIn();
            CalcRetirement();
            printDetailLine();

        }
        CalcAvg();
        PrintAvg();
        CloseFiles();
    }
}

我对编码很陌生，所以除了本学期所学的内容外，我知道的不多。我正在提取的文件中的数据如下。我应该计算 A 和 E 列的平均值。

       A  E
1235 W 45 20
2536 W 55 21
5894 W 60 30
4597 W 75 35
2597 S 35 10
5689 S 40 20
5489 W 55 39
5872 M 60 40
5569 M 55 25
5566 W 80 20
8865 M 59 35
5598 S 65 35

我目前的输出低于..

          Employee Report               
 ID  Age Exp Eligibility 
---- --- --- ----------- 
1235  45  20 lack of exp age
2536  55  21 lack of exp age
5894  60  30 lack age
4597  75  35 can retire
2597  35  10 lack of exp age
5689  40  20 lack of exp age
5489  55  39 lack age
5872  60  40 can retire
5569  55  25 can retire
5566  80  20 lack of exp
8865  59  35 can retire
5598  65  35 can retire
Avg   51  24

平均值应该是 57.0 和 27.5 我错过了什么？

Answer 1

在UpdateTotals() 方法中执行任何计算之前，您最初可能会增加empSum：

while ((lineIn = fileIn.ReadLine()) != null)
{
        UpdateTotals(); // Increments your `empSum` (even for the header row)
        ParseLineIn();
        CalcRetirement();
        printDetailLine();
}

这可能会导致您的平均值除以一个值 13，该值比您预期的 12 大一，这可以解释您当前的问题。在递增 empSum 之前，您可能需要明确检查此行中是否有任何员工数据。