MENU DRIVEN PROGRAM IN JAVA SIMPLE CALCULATOR

MENU DRIVEN PROGRAM IN JAVA SIMPLE CALCULATOR

import java.io.*;

public class Menu

{

    private int a;  //Instance Variable

    private int b;

    private int c;

    private static InputStreamReader in=new InputStreamReader(System.in);

    private static BufferedReader br=new BufferedReader(in);

    void menu()

    {

        //System.out.println("\f");

        System.out.println("1. Addition");

        System.out.println("2. Subtraction");

        System.out.println("3. Multiplication");

        System.out.println("4. Division");

        System.out.println("5. Exit");

        System.out.println("Press your choice.........>");

    }

    void sum(int a,int b)

    {

        this.a=a;

        this.b=b;

        this.c=this.a+this.b;

        System.out.println("Sum="+this.c);

        // this.a=Integer.parseInt(br.readLine());

    }

    void sub(int x,int y)

    {

        a=x;

        b=y;

        c=a-b;

        System.out.println("Subtraction="+c);

    }

    void mult(int x,int y)

    {

        a=x;

        b=y;

        c=a*b;

        System.out.println("Multplication="+c);

    }

    void div(int x,int y)

    {

        a=x;

        b=y;

        c=a/b;

        System.out.println("Division="+c);

    }

    public static void main(String args[])throws IOException

    {

        Menu ob=new Menu();

        int ch,a,b;

        ch=0;

        do

        {

            ob.menu();

            ch=Integer.parseInt(br.readLine());

            switch(ch)

            {

                case 1:

                System.out.println("Enter two number");

                a=Integer.parseInt(br.readLine());

                b=Integer.parseInt(br.readLine());

                ob.sum(a,b);

                break;

                case 2:

                System.out.println("Enter two number");

                a=Integer.parseInt(br.readLine());

                b=Integer.parseInt(br.readLine());

                ob.sub(a,b);

                break;

                case 3:

                System.out.println("Enter two number");

                a=Integer.parseInt(br.readLine());

                b=Integer.parseInt(br.readLine());

                ob.mult(a,b);

                break;

                case 4:

                System.out.println("Enter two number");

                a=Integer.parseInt(br.readLine());

                b=Integer.parseInt(br.readLine());

                ob.div(a,b);

                break;

                case 5:

                System.exit(0);

                default:

                System.out.println("Wrong choice:");

            }

        }while(ch!=5);

    }       

}

Sample Output

1. Addition

2. Subtraction

3. Multiplication

4. Division

5. Exit

Press your choice.........>

1

Enter two number

2

5

Sum=7

1. Addition

2. Subtraction

3. Multiplication

4. Division

5. Exit

Press your choice.........>

5