关键词:
var todo: [String] = ["Finish Collection Course", "BUy Groceries", "Respond to emails", "Pick up dry cleaning", "Order books online", "Mow the lawn"]
for task in todo
print(task)
// Ranges
for number in 1...10
print("\(number) times 5 is equal to \(number*5)")
// While Loop
var x = 0
while x <= 20
print(x)
x += 1
var index = 0
while index < todo.count
print(todo[index])
index += 1
// Repeat While
var counter = 1
while counter < 1
print("I'm inside the while loop")
counter += 1
repeat
print("I'm inside the repeat loop")
counter += 1
while counter < 1
// If Statements
var temperature = 9
if temperature < 12
print("It's getting cold. Let's get taht jacket out.")
else if temperature < 18
print("It's getting chilly. I recommend wearing a light sweater.")
else
print("It feels great outside! A t-shirt will do.")
// Logical Operators
if temperature > 7 && temperature < 12
print("Might want to wear a scarf with that jacket")
var isRaining = true
var isSnowing = false
if isRaining || isSnowing
print("Get out those boots!")
if !isRaining
print("Yay the sun is out")
if isRaining && isSnowing && temperature < 2
print("Put some gloves on")
if (isRaining || isSnowing) && temperature < 2
print("Definitely get the leather gloves out!")
// Switch Statement
let airportCodes = ["LGA", "LHR", "CDG", "HKG", "DXB", "LGW", "JFK", "ORY"]
for airportCode in airportCodes
switch airportCode
case "LGA", "JFK": print("New York")
case "LHR", "LGW": print("London")
case "CDG", "ORY": print("Paris")
case "HKG": print("Hong Kong")
default: print("I don't know which city that airport is in!")
import GameKit
let randomTemperature = GKRandomSource.sharedRandom().nextInt(upperBound: 150)
switch randomTemperature
case 0..<32: print("Forget clothes, you are basically a popsicle")
case 32..<45: print("It's quite cold. You'll need a jacket")
case 45..<70: print("It's a bit chilly. I recommend wearing a light sweater")
case 70...100: print("It's quite hot! T-shirt weather!")
default: print("Don't even bother to go out!")
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