End of Assignment

Implement all the basic functions requirements and some of the credit
points

Author: testert1ng

Calculator.xcodeproj/xcuserdata/TING.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Bucket
+   type = "1"
+   version = "2.0">
+</Bucket>

Calculator/Base.lproj/Main.storyboard

@@ -7,22 +7,53 @@
 //
 
 import UIKit
+import Foundation
+
+extension String {
+    var length: Int {
+        return countElements(self)
+    }
+}
 
 class ViewController: UIViewController {
 
     @IBOutlet weak var display: UILabel!
+    @IBOutlet weak var history: UILabel!
 
     var userIsInTheMiddleOfTypingANumber: Bool = false
+    var isFloatPoint = false
 
     @IBAction func appendDigit(sender: UIButton) {
         let digit = sender.currentTitle!
-        if(userIsInTheMiddleOfTypingANumber){
+        if(digit == "0" && display.text! == "0"){
+            
+        }else if(userIsInTheMiddleOfTypingANumber && display.text! != "0"){
             display.text = display.text! + digit
         }else{
             display.text = digit
             userIsInTheMiddleOfTypingANumber = true
         }
-        
+    }
+    
+    @IBAction func appendFloatPoint(sender: UIButton) {
+        if(!userIsInTheMiddleOfTypingANumber){
+            display.text = "0."
+            isFloatPoint = true
+            userIsInTheMiddleOfTypingANumber = true
+        }else if(!isFloatPoint){
+            display.text = display.text! + "."
+            isFloatPoint = true
+            userIsInTheMiddleOfTypingANumber = true
+        }
+    }
+    
+    @IBAction func appendPi(sender: UIButton) {
+        if(userIsInTheMiddleOfTypingANumber){
+            enter()
+        }
+        display.text = "π"
+        operandStack.append(M_PI)
+        println("operandStack = \(operandStack)")
     }
 
     @IBAction func operate(sender: UIButton) {
@@ -36,6 +67,8 @@ class ViewController: UIViewController {
         case "+": performOperation { $1 + $0 }
         case "−": performOperation { $1 - $0 }
         case "√": performOperation { sqrt($0) }
+        case "sin": performOperation { sin($0) }
+        case "cos": performOperation { cos($0) }
         default: break
         }
     }
@@ -58,10 +91,51 @@ class ViewController: UIViewController {
 
     @IBAction func enter() {
         userIsInTheMiddleOfTypingANumber = false
+        isFloatPoint = false
         operandStack.append(displayValue)
         println("operandStack = \(operandStack)")
     }
 
+    @IBAction func addHistory(sender: UIButton) {
+        if(history.text == "History:"){
+            history.text = sender.currentTitle!
+        }else{
+            history.text = history.text! + sender.currentTitle!
+        }
+    }
+    
+    @IBAction func clear(sender: UIButton) {
+        userIsInTheMiddleOfTypingANumber = false
+        isFloatPoint = false
+        display.text = "0"
+        history.text = "History:"
+        operandStack.removeAll()
+        println("operandStack = \(operandStack)")
+    }
+    
+    @IBAction func backspace(sender: UIButton) {
+        if(userIsInTheMiddleOfTypingANumber && display.text!.length > 0){
+            display.text = display.text!.substringToIndex(advance(display.text!.endIndex, -1))
+            //history.text = history.text!.substringToIndex(advance(history.text!.endIndex, -1))
+            history.text = dropLast(history.text!)
+        }
+    }
+    
+    @IBAction func changeSign(sender: UIButton) {
+        if(userIsInTheMiddleOfTypingANumber){
+            if(isFloatPoint){
+                display.text = "\(displayValue * -1)"
+            }else{
+                display.text = "\(Int(displayValue) * -1)"
+            }
+        }else{
+            if(operandStack.count >= 1){
+                displayValue = operandStack.removeLast() * -1
+                enter()
+            }
+        }
+    }
+    
     var displayValue: Double{
         get{
             return NSNumberFormatter().numberFromString(display.text!)!.doubleValue