C#如何计算输入的数量以找到开关回路中的平均值？

这是我的循环，它询问组号，然后询问捐赠。我想知道如何计算捐款的数量，以找出每个群体的平均数

using System;
public class TotalPurchase
{
    public static void Main()
    {

    double total4 = 0;
    double total5 = 0;
    double total6 = 0;
    int myint = -1;

    while (myint != 0)
    {
        string group;

        Console.WriteLine("Please enter group number (4, 5, or 6)");
        Console.WriteLine("(0 to quit): ");
        group = Console.ReadLine();
        myint = Int32.Parse(group);

        switch (myint)
        {
            case 0:
                break;
            case 4:
                double donation4;
                string inputString4;
                Console.WriteLine("Please enter the amount of the contribution: ");
                inputString4 = Console.ReadLine();
                donation4 = Convert.ToDouble(inputString4);
                total4 += donation4;
                break;
            case 5:
                double donation5;
                string inputString5;
                Console.WriteLine("Please enter the amount of the contribution: ");
                inputString5 = Console.ReadLine();
                donation5 = Convert.ToDouble(inputString5);
                total5 += donation5;
                break;
            case 6:
                double donation6;
                string inputString6;
                Console.WriteLine("Please enter the amount of the contribution: ");
                inputString6 = Console.ReadLine();
                donation6 = Convert.ToDouble(inputString6);
                total6 += donation6;
                break;
            default:
                Console.WriteLine("Incorrect grade number.", myint);
                break;
        }
    }

    Console.WriteLine("Grade 4 total is {0}", total4.ToString("C"));
    Console.WriteLine("Grade 5 total is {0}", total5.ToString("C"));
    Console.WriteLine("Grade 6 total is {0}", total6.ToString("C"));

    }
}

---

任何帮助都将不胜感激。

只需在案例陈述中声明每组的计数以及总数和增量：

case 4:
            double donation4;
            string inputString4;
            Console.WriteLine("Please enter the amount of the contribution: ");
            inputString4 = Console.ReadLine();
            donation4 = Convert.ToDouble(inputString4);
            total4 += donation4;
            count4++; // HERE!!!!
            break;

或者，您可以使用

列表

，也可以计算您的平均值：

 List<int> list4 = new List<int>();

及

---

不确定我是否完全理解您的问题，但您可以为每组添加一个简单的计数器：

int donations4 = 0;
int donations5 = 0;
int donations6 = 0;

然后在每个开关箱中增加该计数器，例如：

switch(myInt)
{
   case 4:
     ...
     donations4++;
     break;
   case 5:
     ...
     donations5++;
     break;
   case 6:
     ...
     donations6++;
     break;
}

然后，当你完成时，简单地做数学运算，找出平均值

虽然这可能是最简单的方法，但更好的方法是将每个群体视为自己的对象，让对象在内部跟踪捐赠金额以及金额和平均数

---

--Dan

用另一个变量记录自己的计数<代码>计数4、计数5等

using System;

public class TotalPurchase
{
    public static void Main()
    {
       double total4 = 0;
       double total5 = 0;
       double total6 = 0;

       int numberOfInputForTotal4 = 0;
       int numberOfInputForTotal5 = 0;
       int numberOfInputForTotal6 = 0;

       int myint = -1;

        while (myint != 0)
        {
            string group;

            Console.WriteLine("Please enter group number (4, 5, or 6)");
            Console.WriteLine("(0 to quit): ");
            group = Console.ReadLine();
            myint = Int32.Parse(group);

            switch (myint)
            {
                case 0:
                    break;
                case 4:
                    double donation4;
                    string inputString4;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString4 = Console.ReadLine();
                    donation4 = Convert.ToDouble(inputString4);
                    total4 += donation4;
                    numberOfInputForTotal4++;
                    break;
                case 5:
                    double donation5;
                    string inputString5;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString5 = Console.ReadLine();
                    donation5 = Convert.ToDouble(inputString5);
                    total5 += donation5;
                    numberOfInputForTotal5++;
                    break;
                case 6:
                    double donation6;
                    string inputString6;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString6 = Console.ReadLine();
                    donation6 = Convert.ToDouble(inputString6);
                    total6 += donation6;
                    numberOfInputForTotal6++;
                    break;
                default:
                    Console.WriteLine("Incorrect grade number.", myint);
                    break;
            }
        }

        Console.WriteLine("Grade 4 total is {0}", total4.ToString("C"));
        Console.WriteLine("Grade 5 total is {0}", total5.ToString("C"));
        Console.WriteLine("Grade 6 total is {0}", total6.ToString("C"));

        Console.WriteLine("Grade 4 average is {0}", (total4 / numberOfInputForTotal4).ToString("C"));
        Console.WriteLine("Grade 5 average is {0}", (total5 / numberOfInputForTotal5).ToString("C"));
        Console.WriteLine("Grade 6 average is {0}", (total6 / numberOfInputForTotal6).ToString("C"));

    }
}

---

如您所见，有3个额外变量（每组一个）可用于计算提供的输入数量。使用该方法，您可以将每组的总数分别除以每组的输入数。

有关家庭作业的加分：

1） 清理您的组号输入-即检查用户输入的组号是否有效

2） 不要调用变量myInt。称它为groupNum，或者描述函数的东西，而不是变量的实现

3） 使用数组计算捐赠总额和计数 即

然后在循环中（甚至不需要开关）：

---

我会将您的double改为List，并在最后使用列表中的Sum（）和Average（）方法。更改后，您的代码将如下所示

    using System;
using System.Collections.Generic;
using System.Linq;
public class TotalPurchase
{
    public static void Main()
    {

        List<double> total4 = new List<double>();
        List<double> total5 = new List<double>();
        List<double> total6 = new List<double>();
        int myint = -1;

        while (myint != 0)
        {
            string group;

            Console.WriteLine("Please enter group number (4, 5, or 6)");
            Console.WriteLine("(0 to quit): ");
            group = Console.ReadLine();
            myint = Int32.Parse(group);

            switch (myint)
            {
                case 0:
                    break;
                case 4:
                    double donation4;
                    string inputString4;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString4 = Console.ReadLine();
                    donation4 = Convert.ToDouble(inputString4);
                    total4.Add(donation4);
                    break;
                case 5:
                    double donation5;
                    string inputString5;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString5 = Console.ReadLine();
                    donation5 = Convert.ToDouble(inputString5);
                    total5.Add(donation5);
                    break;
                case 6:
                    double donation6;
                    string inputString6;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString6 = Console.ReadLine();
                    donation6 = Convert.ToDouble(inputString6);
                    total6.Add(donation6);
                    break;
                default:
                    Console.WriteLine("Incorrect grade number.", myint);
                    break;
            }
        }

        if(total4.Count > 0)
            Console.WriteLine("Grade 4 total is {0}; Average {1}", total4.Sum().ToString("C"), total4.Average().ToString("C"));
        if(total5.Count >0)
            Console.WriteLine("Grade 5 total is {0}; Average {1}", total5.Sum().ToString("C"), total5.Average().ToString("C"));
        if (total6.Count > 0)
            Console.WriteLine("Grade 6 total is {0}; Average {1}", total6.Sum().ToString("C"), total6.Average().ToString("C"));

    }
}

使用系统；
使用System.Collections.Generic；
使用System.Linq；
公共类总购买
{
公共静态void Main（）
{
List total4=新列表（）；
List total5=新列表（）；
List total6=新列表（）；
int-myint=-1；
while（myint！=0）
{
字符串组；
Console.WriteLine（“请输入组号（4、5或6）”；
Console.WriteLine（（0表示退出）：）；
group=Console.ReadLine（）；
myint=Int32.Parse（组）；
开关（myint）
{
案例0：
打破
案例4：
双重捐赠4；
字符串输入string4；
Console.WriteLine（“请输入供款金额：”）；
inputString4=Console.ReadLine（）；
donation4=Convert.ToDouble（inputString4）；
总计4.添加（捐赠4）；
打破
案例5：
双重捐赠5；
字符串输入String5；
Console.WriteLine（“请输入供款金额：”）；
inputString5=Console.ReadLine（）；
donation5=Convert.ToDouble（inputString5）；
总计5.添加（捐赠5）；
打破
案例6：
双重捐赠6；
字符串输入字符串6；
Console.WriteLine（“请输入供款金额：”）；
inputString6=Console.ReadLine（）；
donation6=Convert.ToDouble（inputString6）；
总计6.添加（捐赠6）；
打破
违约：
Console.WriteLine（“不正确的等级编号”，myint）；
打破
}
}
如果（总计4.Count>0）
WriteLine（“四级总计为{0}；平均值为{1}”）、total4.Sum（）.ToString（“C”）、total4.Average（）.ToString（“C”）；
如果（总数5.Count>0）
WriteLine（“5级总计为{0}；平均值为{1}”）、total5.Sum（）.ToString（“C”）、total5.Average（）.ToString（“C”）；
如果（总计6.Count>0）
WriteLine（“6级总计为{0}；平均值为{1}”）、total6.Sum（）.ToString（“C”）、total6.Average（）.ToString（“C”）；
}
}

开关

不是循环，你的标题毫无意义。您是否正在尝试计算每个类别中的项目数？可能重复投票关闭，因为它看起来太像上一个。乔尔，你应该熟悉字典

using System;

public class TotalPurchase
{
    public static void Main()
    {
       double total4 = 0;
       double total5 = 0;
       double total6 = 0;

       int numberOfInputForTotal4 = 0;
       int numberOfInputForTotal5 = 0;
       int numberOfInputForTotal6 = 0;

       int myint = -1;

        while (myint != 0)
        {
            string group;

            Console.WriteLine("Please enter group number (4, 5, or 6)");
            Console.WriteLine("(0 to quit): ");
            group = Console.ReadLine();
            myint = Int32.Parse(group);

            switch (myint)
            {
                case 0:
                    break;
                case 4:
                    double donation4;
                    string inputString4;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString4 = Console.ReadLine();
                    donation4 = Convert.ToDouble(inputString4);
                    total4 += donation4;
                    numberOfInputForTotal4++;
                    break;
                case 5:
                    double donation5;
                    string inputString5;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString5 = Console.ReadLine();
                    donation5 = Convert.ToDouble(inputString5);
                    total5 += donation5;
                    numberOfInputForTotal5++;
                    break;
                case 6:
                    double donation6;
                    string inputString6;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString6 = Console.ReadLine();
                    donation6 = Convert.ToDouble(inputString6);
                    total6 += donation6;
                    numberOfInputForTotal6++;
                    break;
                default:
                    Console.WriteLine("Incorrect grade number.", myint);
                    break;
            }
        }

        Console.WriteLine("Grade 4 total is {0}", total4.ToString("C"));
        Console.WriteLine("Grade 5 total is {0}", total5.ToString("C"));
        Console.WriteLine("Grade 6 total is {0}", total6.ToString("C"));

        Console.WriteLine("Grade 4 average is {0}", (total4 / numberOfInputForTotal4).ToString("C"));
        Console.WriteLine("Grade 5 average is {0}", (total5 / numberOfInputForTotal5).ToString("C"));
        Console.WriteLine("Grade 6 average is {0}", (total6 / numberOfInputForTotal6).ToString("C"));

    }
}

int[] donationCount= new int[MAX_GROUP+1];    // figure out yourself why the +1
int[] donationTotal= new int[MAX_GROUP+1];
// initialize donationCount and donationTotal here

++donationCount[groupNum];
donationTotal[groupNum] += donationAmount;    // did you notice that you moved the reading of donationAmount out of the switch?

    using System;
using System.Collections.Generic;
using System.Linq;
public class TotalPurchase
{
    public static void Main()
    {

        List<double> total4 = new List<double>();
        List<double> total5 = new List<double>();
        List<double> total6 = new List<double>();
        int myint = -1;

        while (myint != 0)
        {
            string group;

            Console.WriteLine("Please enter group number (4, 5, or 6)");
            Console.WriteLine("(0 to quit): ");
            group = Console.ReadLine();
            myint = Int32.Parse(group);

            switch (myint)
            {
                case 0:
                    break;
                case 4:
                    double donation4;
                    string inputString4;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString4 = Console.ReadLine();
                    donation4 = Convert.ToDouble(inputString4);
                    total4.Add(donation4);
                    break;
                case 5:
                    double donation5;
                    string inputString5;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString5 = Console.ReadLine();
                    donation5 = Convert.ToDouble(inputString5);
                    total5.Add(donation5);
                    break;
                case 6:
                    double donation6;
                    string inputString6;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString6 = Console.ReadLine();
                    donation6 = Convert.ToDouble(inputString6);
                    total6.Add(donation6);
                    break;
                default:
                    Console.WriteLine("Incorrect grade number.", myint);
                    break;
            }
        }

        if(total4.Count > 0)
            Console.WriteLine("Grade 4 total is {0}; Average {1}", total4.Sum().ToString("C"), total4.Average().ToString("C"));
        if(total5.Count >0)
            Console.WriteLine("Grade 5 total is {0}; Average {1}", total5.Sum().ToString("C"), total5.Average().ToString("C"));
        if (total6.Count > 0)
            Console.WriteLine("Grade 6 total is {0}; Average {1}", total6.Sum().ToString("C"), total6.Average().ToString("C"));

    }
}