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());
}
}
}
需要考虑输入非数字、负数等
using System;
using System.Collections.Generic;
using System.Text;
namespace 接口实例
{
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
{
public double Height { get; set; }
public double Length { get; set; }
public Rectangle(double l, double h)
{
Height = h;
Length = l;
}
public double Area()
{
if (Height <= 0 || Length <= 0)
{
return 0;
}
return Height * Length;
}
public double Perimeter()
{
if (Height <= 0 || Length <= 0)
{
return 0;
}
return (Height + Length) * 2;
}
}
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());
}
}
}
