Java

qq_49446852: 不对，n=20不对

2301_78055752: import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scan = new Scanner(System.in); double r_c1 = scan.nextDouble(); double r_c2 = scan.nextDouble(); scan.close(); Circle c1 = new Circle(); c1.setR(r_c1); System.out.println(c1.getArea()); System.out.println(c1.getPerimeter()); Circle c2 = new Circle(r_c2); System.out.println(c2.getArea()); System.out.println(c2.getPerimeter()); } } class Circle{ private double r; public Circle() { r = 0; } public Circle(double _r) { r = _r; } public void setR(double R) { r = R; } public double getPerimeter() { return 2*3.14*r; } public double getArea() { return 3.14*r*r; } }

gzxyjy: 运行超时啊哥

Vans的如意: 谢谢

starstxg: 感谢感谢，折腾了好几天终于连上了