Implement a calculator (not postfix notation) using Swift Programming Language(Swift 3, basic
ios app). Please use MVC model(CalculatorBrain.swift can be the model and
ViewController.swift can be the view). Also please post the sreenshot of the storyboard that you
make.
Requirements:
Implement add subtract, multiply, divide, pi, sqrt, Euler’s natural number (e), co-sine and equals.
Ensure you have the ability to handle multiple operations in sequence
Implement the ability to enter floating point numbers into the display
Add 4 more buttons (ex. sine)
Handle multiple operations in a sequence.
Add a memory function to your calculator that stores and retrieves a number. Implement the
following buttons at the top of the keyboard
MC = Memory clear sets memory to 0
MR – Memory recall uses the number in memory acting as it you typed that number in yourself
MS – Memory Store puts the number on display into memory
M+ – Memory takes the number on the display, adds it to the memory, and puts the result into
memory.
Implement a clear (C) button. If the clear button is pressed once, it should take whatever was
typed before the last enter and put it to 0. If the clear is entered twice, it should clear the stack.
Show the history of every operand and operation input by displaying it.
Solution
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var display: UILabel!
@IBOutlet weak var history: UILabel!
var userIsInTheMiddleOfTypingANumber = false
let x = M_PI
@IBAction func appendDigit(sender: UIButton) {
let digit = sender.currentTitle!
if userIsInTheMiddleOfTypingANumber {
display.text = display.text! + digit
} else {
display.text = digit
userIsInTheMiddleOfTypingANumber = true
}
}
@IBAction func operate(sender: UIButton) {
let operation = sender.currentTitle!
switch operation
{
case \"×\": performOperation { $0 * $1 }
case \"÷\": performOperation { $1 / $0 }
case \"+\": performOperation { $0 + $1 }
case \"\": performOperation { $1 - $0 }
case \"\": performOperation { sqrt($0) }
case \"sin\": performOperation { sin($0) }
case \"cos\": performOperation { cos($0) }
default: break
}
}
func performOperation(operation: (Double, Double) -> Double)
{
if operandStack.count >= 2
{
displayValue = operation(operandStack.removeLast(), operandStack.removeLast())
enter()
}
}
func performOperation(operation: (Double) -> Double) {
if operandStack.count >= 1 {
displayValue = operation(operandStack.removeLast())
enter()
}
}
var operandStack = Array()
@IBAction func enter() {
userIsInTheMiddleOfTypingANumber = false
decimalIsPressed = false
operandStack.append(displayValue)
history.text = \"\\(displayValue)\"
println(\"operandStack = \\(operandStack)\")
}
var decimalIsPressed = false
@IBAction func decimal() {
userIsInTheMiddleOfTypingANumber = correct
if decimalIsPressed == false {
display.text = display.text! + \".\"
decimalIsPressed = true
}
}
@IBAction func pi() {
userIsInTheMiddleOfTypingANumber = correct
if display.text != \"0\" {
enter()
display.text =.
LymeDisease1.–What is the disease called -- explain what the name .pdf
1. LymeDisease
1.–What is the disease called -- explain what the name means if necessary? When was the
disease first described?
2. –How does this disease present in a clinical setting -- what would an MD observe upon
examination, what tests would be run to aid with the diagnosis, and what would those tests reveal
if the results are positive?
3. –Who gets this disease -- what is the rate in the general population, are there differential
incidence rates based on gender, geographic location, economic status, educational status, or
other variables?
4. –What is the prognosis upon diagnosis -- the expected duration, and a description of the
disease course throughout the rest of the life of the patient. For example, will there be
progressive decline, intermittent crisis, or sudden, unpredictable crisis? Is the disease likely to
kill the patient, or will they more likely die of something else? Base the prognosis on statistical
evidence if it is available.
Solution
1. Lyme disease name came as a female first reported an unusual cluster of pediatric arthritis in
1975. tgis happened in a small coastal town of connecticut named LYME. In 1977 the disease
named lyme disease on the name of the city LYME.
2. The clinical symptoms of the disease are- fever , headache, arthritis, feeling tired. the other
symptoms are inability to move one or both portions of face, joint pain, neck stiffness.
the MD can order several immunological or molecular test method for the diagnosis of the
disease .western blotting and ELISA are most relevent test for detectinf antibody against it. PCR
can also be used.
3. LYME disease is a zoonosis , which is transmitted to humans by ticks. it is geographically
distributed mostly in the northern hemisphere temperate regions. as it is transmitted by ticks ,
tick removal is important. a person should care for his personal hygenie and cleanness should
wear full clothes.
4. the prognosis varies with the time of the disease. prognosis in early stage of the disease is
curative. after several time if prognosis is made patient complains for joint and muscle pain,
neurocognitive symptoms persisting for years these signs may be present despite antibiotic
treatment.
long term prognosis results in glomerular disease. it may be fetal in some cases.
