circlearea.java

一系列java小程序

public class CircleArea {
  final static double PI=3.14159;  //声明常量
  public static void main(String args[]) {
    double r1=8.0, r2=5.0;
    System.out.println("半径为″+r1+″的圆面积＝"+area(r1));
    System.out.println("半径为″+r2+″的圆面积＝"+area(r2));
  }
 static double area(double r) {
    return (PI*r*r);
  }
}