Day 09 recap

import java.util.Scanner;
public class Day09A {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double num1, num2;
        String op;

        System.out.println("Enter the math operation(+ - * /):");
        op = sc.nextLine();
        System.out.print("Enter 1st Number: ");
        num1 = sc.nextDouble();
        System.out.print("Enter 2nd Number: ");
        num2 = sc.nextDouble();

        if (op.equals("+")) {
            System.out.println(num1 + "+" + num2 + "=" + (num1+num2));
        } else if (op.equals("-")) {
            System.out.println(num1 + "-" + num2 + "=" + (num1-num2));
        }
//        else if (op.equals("_")) {
//            System.out.println(num1 + "_" + num2 + "=" + (num1_num2));
//        }
        else {
            System.out.println("Operator not found");
        }
    }
}

//-------------------------------
public class Day09B {
    public static void main(String[] args) {
        //gagawa ng reference/object
        // ClassName varName = new ClassName();
        Day09B callMe = new Day09B();

        callMe.print1();
        callMe.print1();
        callMe.print2();
        callMe.printCombo();
    }

    void print1() {
        System.out.println("I am print one");
    }
    void print2() {
        System.out.println("Speedy 2");
    }
    void printCombo() {
        System.out.println("Calling other methods");
        print1();
        print2();
    }
}


//-------------------------------

import java.util.Scanner;

public class Day09C {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Day09C callMe = new Day09C();
        double length, width;

        System.out.print("Enter rectangle length: ");
        length = sc.nextDouble();
        System.out.print("Enter rectangle width: ");
        width = sc.nextDouble();

        callMe.computePerimeter(length, width);
        callMe.computeArea(length, width);
    }

    void computePerimeter(double length, double width){
        double perimeter = 2 * (length + width);

        System.out.print("perimeter: ");
        System.out.println(perimeter);
    }

    void computeArea(double length, double width){
        double area = length * width;

        System.out.print("area: ");
        System.out.println(area);
    }
}


//-------------------------------

import java.util.Scanner;

public class Day09D {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Day09D callMe = new Day09D();
        double length = 0, width = 0, height = 0, result = 0;
        int opt;
        String label = "";


        System.out.println("What to compute?");
        System.out.println("1 - Rectangle Area");
        System.out.println("2 - Rectangular Prism Volume");
        System.out.println("3 - Rectangular Prism Surface Area");
        System.out.print(">> ");
        opt = sc.nextInt();

        if (opt >= 1 && opt <= 3) {
            System.out.print("Enter rectangle length: ");
            length = sc.nextDouble();
            System.out.print("Enter rectangle width: ");
            width = sc.nextDouble();
            if (opt > 1) {
                System.out.print("Enter rectangle height: ");
                height = sc.nextDouble();
            }
        }

        switch (opt) {
            case 1:
                label = "area";
                result = callMe.computeArea(length, width);
                break;
            case 2:
                label = "volume";
                result = callMe.computeVolume(length, width, height);
                break;
            case 3:
                label = "surface area";
                result = callMe.computeSurfaceArea(length, width, height);
                break;
        }

        System.out.println(label + " : " +  result);
    }

    double computeArea(double length, double width){
        double area = length * width;

        return area;
    }
    double computeVolume(double length, double width, double height){
        double volume = length * width * height;

        return volume;
    }

    double computeSurfaceArea(double length, double width, double height){
        double sArea =  0;

        return sArea;
    }
}