类的继承.cs

深入浅出C＃,学习C#比较好的用例,能够很快掌握C#.

using System;

class Student//学生类
{
	public Student(string pname)
	{
		name=pname;
		average=semesterhours=0;
	}

	public void addcourse(int hours,double grade)
	{
		average=(semesterhours*average+grade);
		semesterhours+=hours;
		average/=semesterhours;
	}

	public void display()
	{
		Console.WriteLine("name={0},hours={1},average={2}",name,semesterhours,average);
	}

	public  string name;
	public int semesterhours;
	public double average;
}

class Graduatestudent:Student//继承学生类
{
	public Graduatestudent(string pname):base(pname)
	{
	}
	public int qualifiergrade;//除了继承来的成员外还拥有自己的成员 
}

class Mainclass
{
	public static void Main()
	{
		Graduatestudent graduate=new Graduatestudent("graduated");
		Student student=new Student("undergrade");
		student.addcourse(3,2.5);
		student.display();
		graduate.addcourse(3,5);//拥有基类的成员
		graduate.display();//拥有基类的成员
	}
}