简单的 C# 控制台应用程序，用于获取用户输入并计算每个用户的平均值 [关闭]答案

【问题标题】：Simple C# console app to take user input and calculate average for each user [closed]简单的 C# 控制台应用程序，用于获取用户输入并计算每个用户的平均值 [关闭]
【发布时间】：2013-12-04 05:02:46
【问题描述】：

我需要用 C# 编写一个简单的测试控制台应用程序来跟踪学校筹款活动。这是预期输出的样子。用户输入提示将被放置在一个循环内，因此程序会继续要求输入，直到输入“999”作为用户的等级。如果/当输入 999 值时，程序应计算贡献的平均值，并将结果与祝贺信息显示给最大的收集器。

//创建一个将实现所需私有变量的类。创建类方法来完成所需的功能。在 main 方法中，实例化一个募捐对象，并使用该对象访问私有变量。这个问题甚至有意义吗？你如何创建一个类来完成所有这些任务？

Sample output:
/*School Fund Raiser Tracker Application */

Please enter the grade of the contributor (6, 7 or 8)
(Enter 999  to exit):   6

Please enter the amount of the contribution: 100

Please enter the grade of the contributor (6, 7 or 8)
(Enter 999  to exit):  6

Please enter the amount of the contribution:  200

Please enter the grade of the contributor (6, 7 or 8)
(Enter 999  to exit): 7

Please enter the amount of the contribution:  500

Please enter the grade of the contributor (6, 7 or 8)
(Enter 999  to exit): 7

Please enter the amount of the contribution:  100

Please enter the grade of the contributor (6, 7 or 8)
(Enter 999  to exit):  999

Grade Level       # of Contrib   Total Amount      Average
6                    2                300             150
7                    2                600             300

我的看法：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace FundRaiser
{
    public class SchoolFundRaiser
    {
        //public int grade { get; set; }
        //public double contribution { get; set; }
        public double average { get; set; }
        public int numOfContributions { get; set; }


        public void CalculateContribution()
        {
            int grade= 0; double contribution = 0.0;
            double total6 = 0.0, total7 = 0.0, total8 = 0.0, average6 = 0.0, average7 = 0.0, average8 = 0.0;
            int count6 = 0, count7 = 0, count8 = 0;
                while (grade != 999)
                {
                    Console.WriteLine("Please Enter your grade(6, 7, 8). Enter 999 to quit.");
                    grade = Convert.ToInt32(Console.ReadLine());

                    if (grade != 999)
                    {
                        Console.WriteLine("Please Enter the Amount you want to contribute. ");
                        contribution = Convert.ToDouble(Console.ReadLine());
                    }
                    else
                    {
                        Console.WriteLine("Exiting...");
                    }

                    if (grade == 6)
                    {
                        total6 = total6 + contribution;
                        count6 = count6 +1;
                    }

                    if (grade == 7)
                    {
                        total7 = total7 + contribution;
                        count7 = count7 + 1;
                    }

                    else if (grade == 8)
                    {
                        total8 = total8 + contribution;
                        count8= count8 + 1;
                    }



                }

                average6 = total6 / count6;
                average7 = total7 / count7;
                average8 = total8 / count8;

                Console.WriteLine("Grade \t" + "Num of Contributions \t" + "Total Contribution \t" + "Average contribution");
                if (grade == 6)
                {
                    average = average6;
                    numOfContributions = count6;
                    Console.WriteLine(grade + "\t" + numOfContributions + "\t" + total6 + "\t" + average);
                }
                if (grade == 7)
                {
                    average = average7;
                    numOfContributions = count7;
                    Console.WriteLine(grade + "\t" + numOfContributions + "\t" + total7 + "\t" + average);
                }
                else
                {
                    average = average8;
                    numOfContributions = count8;
                    Console.WriteLine(grade + "\t" + numOfContributions + "\t" + total8 + "\t" + average);
                }

        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            SchoolFundRaiser testSchoolFundRaiser = new SchoolFundRaiser();
            testSchoolFundRaiser.CalculateContribution();
        }
    }
}

【问题讨论】：

您至少尝试过什么吗？如果是，请在此处发布。
@Szymon 出于某种原因，它一开始选择不显示我的代码。 Ctrl + K 错误？
您的代码看起来不错。什么问题？
我讨厌我设计课程的方式。我想使用数组而不是所有这些变量。我如何创建数组来跟踪所有可能等级（6,7 或 8）的用户输入以及它们各自的贡献，所以我可以稍后使用它们来计算平均，总计等

标签： c# class loops object

【解决方案1】：

如果你想让它更优雅，你可以使用Dictionary 和通用List<>。下面是接受成绩和贡献的班级，然后显示每个成绩的贡献总数及其平均值。

List 中有 Count 属性用于获取每个年级的贡献数，还有Sum() 方法可以获取每个年级的总贡献，最后还有Average() 方法可以获取每个年级的平均贡献。

contri.Count, contri.Sum(), contri.Average()

在我使用的 Dictionary 的键值对中还需要注意一点 List<double> 的价值，因此它可以根据用户的需要在每个年级做出尽可能多的贡献，例如：

private Dictionary<string, List<double>> entries = new Dictionary<string, List<double>>();

下面是最终代码：

class SchoolFundRaising
{
    private Dictionary<string, List<double>> entries = new Dictionary<string, List<double>>();
    public void displayContributionsSummary()
    {
        Console.WriteLine("Grade \t Num of Contributions \t Total Contribution \t Average contribution");

        foreach (string key in entries.Keys)
        {
            List<double> contri = entries.FirstOrDefault(k => k.Key == key).Value;
            Console.WriteLine("Grade {0} \t {1}         \t      {2}              \t {3}", key, contri.Count, contri.Sum(), contri.Average());
        }
    }

    public void getContributionsGrades()
    {
        int grade = 0;
        double contribution;
        while (grade != 999)
        {
            Console.WriteLine("Please Enter your grade(6, 7, 8). Enter 999 to quit.");
            grade = Convert.ToInt32(Console.ReadLine());

            if (grade >= 6 && grade <= 8)
            {
                Console.WriteLine("Please Enter the Amount you want to contribute. ");
                contribution = Convert.ToDouble(Console.ReadLine());
                if (!entries.ContainsKey(grade.ToString()))
                {
                    List<double> dummyList = new List<double>();
                    dummyList.Add(contribution);
                    entries.Add(grade.ToString(), dummyList);
                }
                else
                {
                    entries.First(k => k.Key == grade.ToString()).Value.Add(contribution);
                }
            }
            else
            {
                if (grade == 999)
                {
                    Console.WriteLine("Done...");
                }
                else
                {
                    Console.WriteLine("Grade should either be 6,7 or 8");
                }
            }
        }
    }
 }

然后你可以像这样调用你的 main：

 SchoolFundRaising FR = new SchoolFundRaising();
 FR.getContributionsGrades();
 FR.displayContributionsSummary();

【讨论】：

【解决方案2】：

另一种方法是使用贡献作为对象和字典来保存贡献等级。

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace FundRaiser
{
    class Program
    {
        public class GradeContribution
        {
            public GradeContribution()
            {
                this.Count = 0;
                this.Total = 0.0;
                this.Average = 0.0;
            }

            int grade;

            public int Grade
            {
                get { return grade; }
                set { grade = value; }
            }
            int count;

            public int Count
            {
                get { return count; }
                set { count = value; }
            }
            double total;

            public double Total
            {
                get { return total; }
                set { total = value; }
            }
            double average;

            public double Average
            {
                get { return average; }
                set { average = value; }
            }

        }

        public class SchoolFundRaiser
        {
            Dictionary<int, GradeContribution> contributionReciept;

            public SchoolFundRaiser()
            {
                contributionReciept = new Dictionary<int, GradeContribution>();
            }

            public void CalculateContribution()
            {
                int grade = 0;
                while (grade != 999)
                {
                    Console.WriteLine("Please Enter your grade(6, 7, 8).\n (Enter 999 to quit):");
                    grade = Convert.ToInt32(Console.ReadLine());

                    if (grade != 999)
                    {
                        GetContribution(grade);
                    }
                    else
                    {
                        Console.WriteLine("Exiting...");
                        DisplayContribution();
                    }
                }
            }

            void GetContribution(int grade)
            {
                Console.WriteLine("Please Enter the Amount you want to contribute. ");
                double contribution = Convert.ToDouble(Console.ReadLine());

                if (contributionReciept.ContainsKey(grade))
                {
                    GradeContribution contribute = contributionReciept[grade];
                    contribute.Count++;
                    contribute.Total += contribution;
                    contribute.Average = (contribute.Total / contribute.Count);
                }
                else
                {
                    GradeContribution contribute = new GradeContribution();
                    contribute.Grade = grade;
                    contribute.Count++;
                    contribute.Total += contribution;
                    contribute.Average = (contribute.Total / contribute.Count);
                    contributionReciept.Add(grade,contribute);
                }
            }

            void DisplayContribution()
            {
                var list = contributionReciept.Keys.ToList();
                list.Sort();

                Console.WriteLine("Grade \t" + "Num of Contributions \t" + "Total Contribution \t" + "Average contribution");

                foreach (var grade in list)
                {
                    GradeContribution gc = contributionReciept[grade];
                    Console.WriteLine(gc.Grade + "\t" + gc.Count + "\t" + gc.Total + "\t" + gc.Average);
                }
            }
        }

        static void Main(string[] args)
        {
            SchoolFundRaiser testSchoolFundRaiser = new SchoolFundRaiser();
            testSchoolFundRaiser.CalculateContribution();
        }
    }
}

【讨论】：