P. 80 Ex. 11.4

// Shavit Borisov
// CW

import java.util.Scanner;

public class pencilCaseEvents {

    public static void main(String[] args)

    {
        Scanner in = new Scanner(System.in);
        pencilCase current;

        int pens;
        int pencils;
        int eventsNum;

        System.out.printf("Enter the number of pens you have in your pencil case: ");
        pens = in.nextInt();

        System.out.printf("Enter the number of pencils you have in your pencil case: ");
        pencils = in.nextInt();

        current = new pencilCase(pens, pencils);

        System.out.printf("How many events happened to your pencil case? ");
        eventsNum = in.nextInt();

        int[] events = new int[2];

        System.out.printf("Enter the numbers of the events: ");
        for(int i = 0; i < eventsNum; i++)
        {
            events[0] = in.nextInt();
            events[1] = in.nextInt();
            if(events[0] == 1)
            {
                if(events[1] == 1)
                    current.addPen();
                else
                    current.addPencil();
            }
            else
            {
                if(events[1] == 1)
                    current.subPen();
                else
                    current.subPencil();
            }
        }

        System.out.printf("Your pencil case has %d pens and %d pencils", current.pens(), current.pencils());

        in.close();
    }
}

// Next class

public class pencilCase
{
    private int pens;
    private int pencils;

    public pencilCase(int pens, int pencils)
    {
        this.pens = pens;
        this.pencils = pencils;
    }

    public void addPencil()
    {
        pencils++;
    }

    public void addPen()
    {
        pens++;
    }

    public void subPencil()
    {
        pencils--;
    }

    public void subPen()
    {
        pens--;
    }

    public int pens()
    {
        return pens;
    }

    public int pencils()
    {
        return pencils;
    }
}