Calculator-iOS/ViewController.swift at master · devSuchit/Calculator-iOS · GitHub

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//
//  ViewController.swift
//  calc.
//
//  Created by Suchit on 26/06/17.
//  Copyright © 2017 Suchit. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var operationLbl: UILabel!

    @IBOutlet weak var resultLbl: UILabel!

    enum Operation: String
    {
        case Divide = "/"
        case Multiply = "*"
        case Subtract = "-"
        case Add = "+"
        case Reminder = "%"
        case Power = "^"
        case Empty = "Empty"
    }

    var currentOperation = Operation.Empty
    var runningNumber = ""
    var leftHand = ""
    var rightHand = ""
    var result = ""
    var operationLblHolder = ""

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    @IBAction func numberPressed(sender: UIButton)
    {
        runningNumber += "\(sender.tag)"
        operationLblHolder += "\(sender.tag)"
        operationLbl.text = ""
        operationLbl.text = operationLblHolder
    }


    @IBAction func dotPressed(sender: UIButton)
    {
        runningNumber += "."
        operationLblHolder += "."
        operationLbl.text = ""
        operationLbl.text = operationLblHolder
    }

    @IBAction func backspacePressed(sender: UIButton)
    {
        if operationLblHolder == ""
        {
            operationLbl.text = "-0"
            runningNumber = "-" + runningNumber
            operationLblHolder = "-"
        }
        else if operationLblHolder == "-"
        {
            operationLbl.text = "0"
            runningNumber = String(runningNumber.characters.dropFirst())
            operationLblHolder = ""
        }
        else if operationLblHolder != "" && operationLblHolder != "-" && runningNumber != ""
        {
            if (Double)(runningNumber)! < 0
            {
                runningNumber = String(runningNumber.characters.dropFirst())

            }
            else
            {
                runningNumber = "-" + runningNumber
            }
        }
    }

    @IBAction func clearPressed(sender: UIButton)
    {
        currentOperation = Operation.Empty
        runningNumber = ""
        leftHand = ""
        rightHand = ""
        result = ""
        operationLblHolder = ""
        operationLbl.text = "0"
        resultLbl.text = "0"
    }

    @IBAction func onDividePressed(sender: UIButton)
    {
        operationLblHolder += "/"
        operationLbl.text = operationLblHolder

        processOperation(operation: .Divide)
    }

    @IBAction func onMultiplyPressed(sender: UIButton)
    {
        operationLblHolder += "x"
        operationLbl.text = operationLblHolder

        processOperation(operation: .Multiply)
    }

    @IBAction func onAddPressed(sender: UIButton)
    {
        operationLblHolder += "+"
        operationLbl.text = operationLblHolder

        processOperation(operation: .Add)
    }


    @IBAction func onSubtractPressed(sender: UIButton)
    {
        operationLblHolder += "-"
        operationLbl.text = operationLblHolder

        processOperation(operation: .Subtract)
    }


    @IBAction func onReminderPressed(sender: UIButton)
    {
        operationLblHolder += "%"
        operationLbl.text = operationLblHolder

        processOperation(operation: .Reminder)
    }

    @IBAction func onPowerPressed(sender: UIButton)
    {
        operationLblHolder += "^"
        operationLbl.text = operationLblHolder

        processOperation(operation: .Power)
    }

    @IBAction func equalsPressed(sender: UIButton)
    {
        processOperation(operation: currentOperation)
    }

    func processOperation(operation: Operation)
    {
        if currentOperation != Operation.Empty
        {
            if runningNumber != ""
            {
                rightHand = runningNumber
                runningNumber = ""

                if currentOperation == Operation.Divide
                {
                    result = "\((Double)(leftHand)! / (Double)(rightHand)!)"
                }
                else if currentOperation == Operation.Multiply
                {
                    result = "\((Double)(leftHand)! * (Double)(rightHand)!)"
                }
                else if currentOperation == Operation.Subtract
                {
                    result = "\((Double)(leftHand)! - (Double)(rightHand)!)"
                }
                else if currentOperation == Operation.Add
                {
                    result = "\((Double)(leftHand)! + (Double)(rightHand)!)"
                }
                else if currentOperation == Operation.Reminder
                {
                    result = "\((Double)(leftHand)!.truncatingRemainder(dividingBy: (Double)(rightHand)!))"
                }
                else if currentOperation == Operation.Power
                {
                    result = "\(pow((Double)(leftHand)! , (Double)(rightHand)!))"
                }
                    leftHand = result
                    resultLbl.text = result

            }
            currentOperation = operation

        }
        else
        {
            leftHand = runningNumber
            runningNumber = ""
            currentOperation = operation
        }
    }

}