题解 | 单组_spj判断浮点误差
单组_spj判断浮点误差
https://www.nowcoder.com/practice/6652094c6a0e4381911b541ed664d8b7
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
int r = sc.nextInt();
sc.close();
double area = r*r*Math.PI;
System.out.println(String.format("%.10f",area));
}
}
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