继承编程1

using System;
namespace HelloWorldApplication
{

	class shape{
		protected int width;
		protected int height;
		public void Width(int w){
			width=w;
		}
		public void Height(int h){
			height=h;
		}
	}
	class rectangle:shape{
		public int getarea(){
			return (width*height);
		}
	}
		
	class rectangletester{
		static void Main(string[] args){
			rectangle rec=new rectangle();
			rec.Width(2);
			rec.Height(3);
			Console.WriteLine("面积是{0}",rec.getarea());
			Console.ReadLine();
			
		}
	}
			
}

方法后记得加括号