C# 学生信息管理控制台应用程序设计：小学生、中学生、大学生成绩统计

using System; using System.Collections.Generic;

namespace ConsoleApp1 { abstract class Student { protected string name; // 学生姓名 protected int age; // 学生年龄 public static int num = 0; // 班级学生人数，静态变量 public Student(string name, int age) { this.name = name; this.age = age; num++; } public string Name { get => name; } public virtual string GetStudentType() { return 'student'; } public abstract double Sum(); // 抽象方法 public string GetInfo() { return string.Format('Name:{0}, {1}, Age is {2}', name, GetStudentType(), age); } }

class Pupil : Student
{
    protected double chinese; // 语文成绩
    protected double math; // 数学成绩
    public Pupil(string name, int age, double chinese, double math) : base(name, age)
    {
        this.chinese = chinese;
        this.math = math;
    }
    public override string GetStudentType() { return 'pupil'; }
    public override double Sum()
    {
        return Math.Round((chinese + math) / 2, 2); // 保留两位小数
    }
    public new string GetInfo() // 隐藏父类
    {
        return string.Format('{0}, AvgScore:{1:f2};', base.GetInfo(), Sum());
    }
}

class Middle : Student
{
    protected double chinese;
    protected double math;
    protected double english;
    public Middle(string name, int age, double chinese, double math, double english) : base(name, age)
    {
        this.chinese = chinese;
        this.math = math;
        this.english = english;
    }
    public override string GetStudentType() { return 'middle school student'; }
    public override double Sum()
    {
        return Math.Round((chinese + math + english) / 3, 2);
    }
    public new string GetInfo()
    {
        return string.Format('{0}, AvgScore:{1:f2};', base.GetInfo(), Sum());
    }
}

class College : Student
{
    protected double compulsoryCredits; // 必修课学分
    protected double optionalCredits; // 选修课学分
    public College(string name, int age, double compulsoryCredits, double optionalCredits) : base(name, age)
    {
        this.compulsoryCredits = compulsoryCredits;
        this.optionalCredits = optionalCredits;
    }
    public override string GetStudentType() { return 'college student'; }
    public override double Sum()
    {
        return Math.Round(compulsoryCredits + optionalCredits, 2);
    }
    public new string GetInfo()
    {
        return string.Format('{0}, TotalCredits :{1:f2};', base.GetInfo(), Sum());
    }
}

class Program
{
    static void Main(string[] args)
    {
        List<Student> students = new List<Student>();
        string[] input;
        while ((input = Console.ReadLine().Split())[0] != '0')
        {
            if (input.Length != 6 || !(input[0] == '1' || input[0] == '2' || input[0] == '3'))
                continue;
            string name = input[1];
            int age = int.Parse(input[2]);
            double a = double.Parse(input[3]);
            double b = double.Parse(input[4]);
            int type = int.Parse(input[0]);
            if (type == 1)
                students.Add(new Pupil(name, age, a, b));
            else if (type == 2)
                students.Add(new Middle(name, age, a, b, double.Parse(input[5])));
            else if (type == 3)
                students.Add(new College(name, age, a, b));
            Console.WriteLine('Total number of student:{0}, {1}', Student.num, students[students.Count - 1].GetInfo());
        }
    }
}

}