接口实例（C#,IShape）
题目描述
接口实例。接口和类如下图所示，根据给出代码，补写缺失的代码，然后在Program类的静态Main方法中验证所实现的类。
using System;
namespace Myinterface
{
public interface IShape
{
double Perimeter();
double Area();
}
class Circle : IShape
{
public double Radius { get; set; }
public Circle(double r)
{
Radius = r;
}
public double Area()
{
return Math.PI * Radius * Radius;
}
public double Perimeter()
{
return 2 * Math.PI * Radius;
}
}
class Rectangle : IShape
{
/
//请填写代码，实现输出矩形的面积和周长
/
}
class Program
{
static void Main(string[] args)
{
double w, h;
double.TryParse(Console.ReadLine(), out w);
double.TryParse(Console.ReadLine(), out h);
Rectangle r = new Rectangle(w, h);
Console.WriteLine("area={0},Perimeter={1}",r.Area(), r.Perimeter());
}
}
}
输入
输入矩形长、高，如
10
3
输出
area=30,Perimeter=26
样例输入
10
3
样例输出
area=30,Perimeter=26
提示
需要考虑输入非数字、负数等
private double w, h;public Rectangle(double w,double h){this.w = w;this.h = h;}public double Perimeter(){if (w <= 0 || h <= 0) return 0;return 2.0 * w + 2.0 * h;}public double Area(){if (w <= 0 || h <= 0) return 0;return w * h;}
