using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;

namespace?ConsoleApplication
{
????class?Circle
????{
???????
????????private?const?float?PI?=?3.141526F;

????????//1.沒有任何已知條件
????????public?static?double?Area()
????????{?
????????????Console.WriteLine("空空如也！");
????????????return?0;
????????
????????}
????????//2.已知圓心坐標
????????public?static?double?Area(int?x1,?int?y1)
????????{
????????????Console.WriteLine("這是一個圓點，坐標為({0},{1})",x1,y1);
????????????return?0;
????????}
????????//3.已知半徑
????????public?static?double?Area(double?r)
????????{
????????????double?theArea;
????????????theArea?=?PI?*?r?*?r;
????????????return?theArea;

????????}
????????//4.已知圓心坐標和半徑
????????public?static?double?Area(int?x1,?int?y1,?double?r)
????????{
????????????Console.WriteLine("這是一個圓點在({0},{1})半徑為{2}的圓",?x1,?y1,?r);
????????????return?Area(r);
????????
????????}
????????//5.已知圓心和圓周邊上的一點
????????public?static?double?Area(int?x1,?int?y1,?int?x2,?int?y2)
????????{
????????????int?x?=?x2?-?x1;
????????????int?y?=?y2?-?y2;
????????????double?r?=?(double)Math.Sqrt(x*x+y*y);
????????????Console.WriteLine("這是一個圓心在({0},{1}),圓周邊一點在({2},{3})的圓，圓的半徑為{4}",x1,y1,x2,y2,r);
????????????return?Area(r);
????????
????????}
????????static?void?Main(string[]?args)
????????{
????????????int?x1=2,x2=4;??????????//x坐標
????????????int?y1=3,y2=5;??????????//y坐標
????????????double?radius=3;????????//半徑
????????????double?CircleArea?=?0;
????????????CircleArea?=?Area();
????????????Console.WriteLine("-->1.面積為{0}",CircleArea);
????????????Console.WriteLine();

????????????CircleArea?=?Area(x1,y1);
????????????Console.WriteLine("-->2.面積為{0}",?CircleArea);
????????????Console.WriteLine();

????????????CircleArea?=?Area(radius);
????????????Console.WriteLine("-->3.面積為{0}",?CircleArea);
????????????Console.WriteLine();

????????????CircleArea?=?Area(x1,?y1,?radius);
????????????Console.WriteLine("-->4.面積為{0}",?CircleArea);
????????????Console.WriteLine();

????????????CircleArea?=?Area(x1,?y1,?x2,?y2);
????????????Console.WriteLine("-->5.面積為{0}",?CircleArea);
????????????Console.WriteLine();

????????????Console.ReadKey();

????????}
???????
????}
}

轉載于:https://www.cnblogs.com/zhangzufa/archive/2009/04/01/1427370.html

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