TQC+ JAVA 110

TQC+ JAVA 110 圓形面積

import java.util.Scanner;
public class JPA01 {
    public static void main(String args[]) {
        double totalarea;
        System.out.printf("圓形面積為：%f \n",calCircle(5));
        System.out.printf("三角形面積為：%f \n",calTriangle(10,5));

        System.out.printf("方形面積為：%f \n",calRectangle(5,10));
        totalarea = calCircle(5)+calTriangle(10,5)+calRectangle(5,10);
        System.out.printf("此圖形面積為：%f \n",totalarea);
    }
    static double calCircle(int r) {
        return r*r*3.1415926;
    }
    static double calTriangle(int a,int b) {
        return a*b/2;
    }
    static double calRectangle(int a,int b) {
        return a*b;
    }
}