2018-12-19

//计算半径为5的圆的面积和周长并打印出来。（pi为3.14）面积pi*r*r，perimeter（周长）

 int r = 5;

double pi = 3.14;

 double area = pi * r * r;

double perimeter = pi * 2 * r;

 Console.WriteLine("半径为{0}的圆的面积是{1}周长是{2}",r,area,perimeter);

 Console.ReadKey();