#编码
int r = 5;
double p=3.14;
double s=p*r*r;
double c=2*p*r;
Console.WriteLine("圆的面积是:{0},周长是:{1}",s ,c);
Console.ReadKey();
#效果
图片发自简书App
int r = 5;
double p=3.14;
double s=p*r*r;
double c=2*p*r;
Console.WriteLine("圆的面积是:{0},周长是:{1}",s ,c);
Console.ReadKey();