using System
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Circle
{
class Program
{
static void Main(string[]args)
{
const double Pi = 3.1415926;
int r;
Console.Write("请输入圆的半径:");
r=Convert.ToInt32(Console.readLine());
double s = 0;
s =Pi * r * r
Console.WriteLine(圆的半径是{0},面积是{1}",r,s);
}
}
}
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