题解 | 牛牛的圆
牛牛的圆
https://www.nowcoder.com/practice/75a202e826d048a39824ec694b5ce7e3
using System;
public class Program {
public static void Main() {
const double pi = 3.14;
double r = double.Parse(Console.ReadLine());
double s = pi * Math.Pow(r,2);
Console.WriteLine(s);
}
}
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