Java Program to Make Simple Calculator

/* Java Program Example - Make Calculator */

import java.util.Scanner;

public class JavaProgram
{
    public static void main(String args[])
    {
        float a, b, res;
        char choice, ch;
        Scanner scan = new Scanner(System.in);

        do
        {
            System.out.print("1. Addition\n");
            System.out.print("2. Subtraction\n");
            System.out.print("3. Multiplication\n");
            System.out.print("4. Division\n");
            System.out.print("5. Exit\n\n");
            System.out.print("Enter Your Choice : ");
            choice = scan.next().charAt(0);
            switch(choice)
            {
                case '1' : System.out.print("Enter Two Number : ");
                    a = scan.nextFloat();
                    b = scan.nextFloat();
                    res = a + b;
                    System.out.print("Result = " + res);
                    break;
                case '2' : System.out.print("Enter Two Number : ");
                    a = scan.nextFloat();
                    b = scan.nextFloat();
                    res = a - b;
                    System.out.print("Result = " + res);
                    break;
                case '3' : System.out.print("Enter Two Number : ");
                    a = scan.nextFloat();
                    b = scan.nextFloat();
                    res = a * b;
                    System.out.print("Result = " + res);
                    break;
                case '4' : System.out.print("Enter Two Number : ");
                    a = scan.nextFloat();
                    b = scan.nextFloat();
                    res = a / b;
                    System.out.print("Result = " + res);
                    break;
                case '5' : System.exit(0);
                    break;
                default : System.out.print("Wrong Choice!!!");
                    break;
            }
            System.out.print("\n---------------------------------------\n");
        }while(choice != 5);       
    }
}

Tip Calculator in Swift Programming

How to write a program to create Tip Calculator in Swift Programming

//

//  ViewController.swift

//  Tip Calculator

//

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    //Outlets

    @IBOutlet weak var tenPercent: UIButton!

    @IBOutlet weak var fifteenPercent: UIButton!

    @IBOutlet weak var twentyPercent: UIButton!

    @IBOutlet weak var twentyFivePercent: UIButton!

    @IBOutlet weak var billInput: UITextField!

    @IBOutlet weak var finalTipAmount: UILabel!

    @IBOutlet weak var splitDisplay: UILabel!

    @IBOutlet weak var personDisplay: UILabel!

    @IBOutlet weak var downButtonOutlet: UIButton!

    

    @IBAction func billInputAction(sender: UITextField) {

        billInput.resignFirstResponder()

        billAmount = (Double)(billInput.text!)!

    }

    @IBAction func viewTapped(sender : AnyObject) {

        billInput.resignFirstResponder()

        billAmount = (Double)(billInput.text!)!

        

    }

    

    

    @IBAction func tenPercent(sender: UIButton) {

        resetSelectedPercentage(10)

    }

    @IBAction func fifteenPercent(sender: AnyObject) {

        resetSelectedPercentage(15)

    }

    @IBAction func twentyPercent(sender: UIButton) {

        resetSelectedPercentage(20)

    }

    @IBAction func twentyFivePercent(sender: AnyObject) {

        resetSelectedPercentage(25)

    }

    

    @IBAction func calculateButton(sender: UIButton) {

        let tempResult = (billAmount * gratuityPercent) / (Double)(peopleToSplit)

        finalTipAmount.text = "$" + (NSString(format: "%.2f", tempResult) as String)

    }

    @IBAction func upButton(sender: AnyObject) {

        peopleToSplit++

        splitDisplay.text = (String)(peopleToSplit)

        if(peopleToSplit > 1){

            personDisplay.text = "People"

            downButtonOutlet.enabled = true

        }

    }

    @IBAction func downButton(sender: AnyObject) {

        peopleToSplit--

        splitDisplay.text = (String)(peopleToSplit)

        if(peopleToSplit == 1){

            personDisplay.text = "Person"

            downButtonOutlet.enabled = false

        }

    }

    

    

    

    //Variables

    var gratuityPercent = 0.0

    var billAmount = 0.0

    var peopleToSplit = 1

    

    

 

    //Functions

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    

    func textFieldShouldReturn(textField: UITextField) -> Bool {

        billAmount = (Double)(billInput.text!)!

        billInput.resignFirstResponder()

        return true

    }

    

    func textFieldDidEndEditing(textField: UITextField) {

        billAmount = (Double)(billInput.text!)!

    }

    

    

   

    func resetSelectedPercentage(percentage:Int){

        tenPercent.setImage(UIImage(named: "10_unselected_image"), forState: UIControlState.Normal)

        fifteenPercent.setImage(UIImage(named: "15_unselected_image"), forState: UIControlState.Normal)

        twentyPercent.setImage(UIImage(named: "20_unselected_image"), forState: UIControlState.Normal)

        twentyFivePercent.setImage(UIImage(named: "25_unselected_image"), forState: UIControlState.Normal)

        switch percentage {

        case 10:

            gratuityPercent = 0.1

            tenPercent.setImage(UIImage(named: "10_selected_image"), forState: UIControlState.Normal)

        case 15:

            gratuityPercent = 0.15

            fifteenPercent.setImage(UIImage(named: "15_selected_image"), forState: UIControlState.Normal)

        case 20:

            gratuityPercent = 0.2

            twentyPercent.setImage(UIImage(named: "20_selected_image"), forState: UIControlState.Normal)

        case 25:

            gratuityPercent = 0.25

            twentyFivePercent.setImage(UIImage(named: "25_selected_image"), forState: UIControlState.Normal)

        default:

            gratuityPercent = 0.0

        }

        

    }

}