Question

c#编写输入圆的半径求面积

c#编写输入圆的半径求面积

Answer 1

Answer 2

class Program
{
static void Main(string[] args)
{
double r=0,c,s;
Console.WriteLine("Please Enter The R:");
try
{
r = Convert.ToDouble(Console.ReadLine());
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
c = Math.PI * 2 * r;
s = Math.PI * r * r;
Console.WriteLine("The Perimeter of The Circle is {0},The Area of The Circle is {1}", c, s);
Console.ReadLine();
}

}