OOP_多態（C#）

一個評選優秀教師和學生的程序，其類結構如圖1所示。當輸入一系列教師或學生的記錄后，將優秀學生及教師的姓名列出。

code：

namespace DuoTaiGoodStuTeach {public class Base{public int num;protected string name;public Base(string name){ this.name = name; }public virtual void getnum(){ }public virtual int ifgood(){ return 0; }public void pritname(){ Console.Write(this.name); }}public class Student : Base{public int numS; /下面調用基類的構造函數public Student(string nameS): base(nameS){ }public override void getnum(){numS=Convert.ToInt32(Console.ReadLine());//return base.getnum();}public override int ifgood(){if (numS >70) return 1;else return 0;}}public class Teacher : Base{public int numT;public Teacher(string nameT): base(nameT){ }public override void getnum(){numT = Convert.ToInt32(Console.ReadLine());}public override int ifgood(){if (numT > 3) return 1;else return 0;}}class Program{static void Main(string[] args){string continu = "y"; string[] goodS = new string[66]; int i = 0; int flag = 0; int flag2 = 0; //int k = 0;while (continu == "y"){ Console.WriteLine("Input teacher(t) or student(s):");string choice= Console.ReadLine();switch (choice){case "s":Console.Write("姓名：");string nameS = Console.ReadLine();Student baseS = new Student(nameS);Console.Write("成績：");flag+=1;//記錄輸入（姓名成績）的學生個數baseS.getnum(); //int numS =Convert.ToInt32(Console.ReadLine());while (baseS.ifgood() == 1){ goodS[i] = nameS;i += 1;break;}Console.Write("continue(y/n)?");if (Console.ReadLine() == continu){ continue; }else{// continu = "n";//Console.Write("優秀者的姓名：");//for (int j = 0; j < flag; j++)//{// Console.Write(goodS[j]+" ");//}break;}case "t": Console.Write("姓名：");string nameT = Console.ReadLine();Teacher baseT = new Teacher(nameT);Console.Write("每年發表論文數：");flag2+=1;//記錄輸入（姓名成績）的老師個數baseT.getnum();while (baseT.ifgood()==1){goodS[i] = nameT; i += 1; //老師和學生全存在goodS[]中break;}Console.Write("continue(y/n)?");if (Console.ReadLine() == continu){ continue; }else{break;}default:break;}continu = "n";Console.Write("優秀者的姓名：");for (int j = 0; j < i;j++)//flag+flag2; j++){Console.Write(goodS[j] + " ");}}}} }

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