package MaxDome;

public class AreaDemo {

public double yuan(double a) {

double yuan;

yuan=Math.PI*a;

return yuan;

}

public double changfangxing(double b,double c) {

double changfangxing;

changfangxing=b*c;

return changfangxing;

}

public static void main(String[] args) {

// 定义数名

double a=4.5,b=8,c=5;

AreaDemo sc=new AreaDemo();

System.out.println("长方形的面积"+sc.changfangxing(b, c));

System.out.println("园的面积"+sc.yuan(a));

}

}