import UIKit
func displayPi() {
print("3.1415926535")
}
displayPi()
//Parameters
func triple(value: Int) {
let result = value * 3
print("If you multiply \(value) by 3, you'll get \(result).")
}
triple(value: 10)
func multiply(firstNumber: Int, secondNumber: Int) {
let result = firstNumber * secondNumber
print("The result is \(result).")
}
multiply(firstNumber: 7, secondNumber: 8)
//Argument Labels
func sayHello(to firstPerson: String, and SecondPerson: String) {
print("Hello, \(firstPerson) and \(SecondPerson).")
}
sayHello(to: "Jancy", and: "Yvonne")
//Default Parameters
func display(teamName: String, score: Int = 0) {
print("\(teamName): \(score)")
}
display(teamName: "Wombats", score: 100)
display(teamName: "Warriors")
//Return Values
func multiply1(firstNumber: Int, secondNumber: Int) -> Int {
let result = firstNumber * secondNumber
return result
}
print(multiply1(firstNumber: 7, secondNumber: 8))
let myResult = multiply1(firstNumber: 5, secondNumber: 5)
print("5 * 5 is \(myResult)")
print("5 * 2 is \(multiply1(firstNumber: 5, secondNumber: 2))")Intermediate Swift – Chapter 2.1 Strings
import UIKit
let joke = """
Q: Why did the chicken cross the road?
A: To get to the other side!
"""
print(joke)
let greeting = "It is traditional in programming to print \"Hello World\"."
print(greeting)
var myString = ""
if myString.isEmpty {
print("The string is empty.")
}
myString
let string1 = "Hello"
let string2 = ", world!"
let myString1 = string1 + string2
print(myString1)
var myString2 = "Hello"
myString2 = myString2 + ", world!"
myString2 += " Hello!"
print(myString2)
//String Interpolation
let name = "Kenneth"
let age = 53
print("\(name) is \(age) years old.") // Kenneth is 53 years old.
let a = 4
let b = 5
print("If a is \(a) and b is \(b), then a + b equals \(a+b)")
//String Equality and Comparison
let month = "January"
let otheMonth = "January"
let lowercasedMonth = "january"
if month == otheMonth {
print("They are he same")
}
if month != lowercasedMonth {
print("They are not the same.")
}
let name1 = "Johnny Appleseed"
if name1.lowercased() == "joHnny aPPleseeD".lowercased() {
print("The two names are equal.")
}
let greeting1 = "Hello, world!"
print(greeting1.hasPrefix("Hello"))
print(greeting1.hasSuffix("world!"))
print(greeting1.hasSuffix("World!"))
let greeting2 = "Hi Jancy, my name is Kenneth."
if greeting2.contains("my name is") {
print("Making an introduction")
}
//Counting characters
let count = name.count
print(count)
let newPassword = "1234"
if newPassword.count < 8 {
print("The password is too short. Passwords must have at least 8 characters.")
}
//Switch Statements
let someCharacter: Character = "e"
switch someCharacter {
case "a", "e", "i", "o", "u":
print("\(someCharacter) is a vowel")
default:
print("\(someCharacter) is not a vowel")
}
