我如何为每个用户输入编号？ C＃

Question

刚开始学习C＃，我的问题是如何按顺序记录用户输入： score 1:

score 1: 98
score 2: 76
score 3: 65
score 4: 78
score 5: 56

在我的代码中我可以输入数字，但似乎无法设置顺序我如何实现这个目标我的输入：

98
76
65
78
56

码：

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

namespace MyGrade03
{
    public class Program
    {
        private int total;  // sum of grades
        private int gradeCounter; //number of grades entered
        private int aCount; // Count of A grades
        private int bCount; // Count of B grades
        private int cCount; // Count of C grades
        private int dCount; // Count of D grades
        private int fCount; // Count of F grades
        private string v;



        public string CourseName { get; set; }

        public Program(string name)
        {
            CourseName = name;
        }

        public void DisplayMessage()
        {
            Console.WriteLine("Welcome to the grade book for \n{0}!\n",
                CourseName);
        }

        public void InputGrade()
        {
            int grade;
            string input;

            Console.WriteLine("{0}\n{1}",
                "Enter the integer grades in the range 0-100",
                "Type <Ctrl> z and press Enter to terminate input:");

            input = Console.ReadLine(); //read user input

            while (input != null)
            {
                grade = Convert.ToInt32(input); //read grade off user input
                total += grade;// add grade to total
                gradeCounter++; //  increment number of grades

                IncrementLetterGradeCounter(grade);

                input = Console.ReadLine();
            }
        }
        private void IncrementLetterGradeCounter(int grade)

        {
            switch (grade / 10)
            {
                case 9: //grade was in the 90s
                case 10:
                    ++aCount;
                    break;
                case 8:
                    ++bCount;
                    break;
                case7:
                    ++cCount;
                case6:
                    ++dCount;
                    break;
                default:
                    ++fCount;
                    break;

            }
        }
        public void DisplayGradeReport()
        {
            Console.WriteLine("\nGrade Report");

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

                Console.WriteLine("Total of the {0} grades entered is {1}",
                    gradeCounter, total);
                Console.WriteLine("class average is {0:F}", average);
                Console.WriteLine("{0}A: {1}\nB: {2}\nC: {3}\nD: {4}\nF: {5} ",
                    "Number of students who received each grade: \n",
                   aCount,
                   bCount,
                   cCount,
                   dCount,
                   fCount);
            }
            else
                Console.WriteLine("No grades were entered");
        }
        static void Main(string[] args)
        {
            Program mygradebook = new Program(
                "CS101 introduction to C3 programming");
            mygradebook.DisplayMessage();
            mygradebook.InputGrade();
            mygradebook.DisplayGradeReport();
        }
    }
}

Answer 1

声明一个变量来计算像private static int counter = 0;这样的输入private static int counter = 0;
在InputGrade方法中，如下所示

Console.WriteLine("{0}\n{1}",
                "Enter the integer grades in the range 0-100",
                "Type <Ctrl> z and press Enter to terminate input:");
counter++;
System.Console.Write("score " + counter + ":");
input =  Console.ReadLine(); //read user input

和内部while (input != null)如下所示

IncrementLetterGradeCounter(grade);
counter++;
System.Console.Write("score " + counter + ":");
input = Console.ReadLine();

所以，输出就像

这是完整的代码

    public class Program
    {
        private int total;  // sum of grades
        private int gradeCounter; //number of grades entered
        private int aCount; // Count of A grades
        private int bCount; // Count of B grades
        private int cCount; // Count of C grades
        private int dCount; // Count of D grades
        private int fCount; // Count of F grades
        private string v;
        private static int counter = 0;


        public string CourseName { get; set; }

        public Program(string name)
        {
            CourseName = name;
        }

        public void DisplayMessage()
        {
            Console.WriteLine("Welcome to the grade book for \n{0}!\n",
                CourseName);
        }

        public void InputGrade()
        {
            int grade;
            string input;

            Console.WriteLine("{0}\n{1}",
                "Enter the integer grades in the range 0-100",
                "Type <Ctrl> z and press Enter to terminate input:");
            counter++;
            System.Console.Write("score " + counter + ":");
            input =  Console.ReadLine(); //read user input

            while (input != null)
            {
                grade = Convert.ToInt32(input); //read grade off user input
                total += grade;// add grade to total
                gradeCounter++; //  increment number of grades

                IncrementLetterGradeCounter(grade);
                counter++;
                System.Console.Write("score " + counter + ":");
                input = Console.ReadLine();
            }
        }
        private void IncrementLetterGradeCounter(int grade)
        {
            switch (grade / 10)
            {
                case 9: //grade was in the 90s
                case 10:
                    ++aCount;
                    break;
                case 8:
                    ++bCount;
                    break;
                case7:
                    ++cCount;
                case6:
                    ++dCount;
                    break;
                default:
                    ++fCount;
                    break;

            }
        }
        public void DisplayGradeReport()
        {
            Console.WriteLine("\nGrade Report");

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

                Console.WriteLine("Total of the {0} grades entered is {1}",
                    gradeCounter, total);
                Console.WriteLine("class average is {0:F}", average);
                Console.WriteLine("{0}A: {1}\nB: {2}\nC: {3}\nD: {4}\nF: {5} ",
                    "Number of students who received each grade: \n",
                   aCount,
                   bCount,
                   cCount,
                   dCount,
                   fCount);
            }
            else
                Console.WriteLine("No grades were entered");
        }
        static void Main(string[] args)
        {
            Program mygradebook = new Program(
                "CS101 introduction to C3 programming");
            mygradebook.DisplayMessage();
            mygradebook.InputGrade();
            mygradebook.DisplayGradeReport();
            Console.ReadKey();
        }
    }

Answer 2

有许多数据结构可以让您按顺序存储数据。 我个人推荐一个List<int> 。

您可以像下面这样添加内容：

var list = new List<int>();
list.Add(37);
list.Add(95);

您可以使用迭代器（ foreach(var score in list){...} ）读取它，或者获取单个数字（ var firstScore = list[0] ）。 该文档将告诉您有关List<T> 。

Answer 3

您可以在C＃（ MSDN集合 ）中查找可用的集合 。

在您的情况下，您并不真正关心订单，您可以使用List<int> 。 否则，如果要保留订单，可以使用Stack<int>或Queue<int> 。 如果你想保留学生姓名+分数的集合，你可以使用Dictionary<string,int>