巫晉宇

package dwaawd;

public class wdawdawad {
        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(10,5));
    totalarea = calCircle(5)+calTriangle(10,5)+calRectangle(10,5);
    System.out.printf("此圖形面積為：%f \n",totalarea);
}
    static  double    calCircle(int e) {
    return e*e*3.14;
}
    static  double calTriangle(int e ,int o) {
    return e*o/2;
}
    static  double calRectangle(int e,int o) {
             return e*o;
        }

}