Swift 3 Bottom Up: Ep2 - Math and Boolean Operators (https://youtu.be/MANAkWA4_f0)

Operators_and_Boolean_Logic.swift

import Darwin

// MARK: Operators
// = : Assignment
// + : Addition
// - : Subtraction
// * : Multiplication
// / : Division
// % : Modulus, Divison returning the remainder
// += : Addition followed by an assigment
// -= : Minus followed by assignment
// ^ : Bitwise XOR (NOT POWER FUNCTION) instead use Darwin and pow function

let one = 1
var two = 2.0
var three = 3.0

three + two
three + 3 + two
three - two
three * two
three / two

15 % 5 // 15 / 5 = 3 (no remainder)
16 % 5 // 16 / 5 = 3 remainder 1

var test = 1
test += 3
test
test -= 1
test

pow(2.0, 4.0)

// MARK : Boolean logic comparisons

// == : Equals
// != : Not Equal
// < : Less than
// > : Greater than
// <= : Less than or equal to
// >= : Greater than or equal to

0 == 0
0 == 1

0 != 1
0 != 0

0 < 0
0 > 0

0 < 1
0 > 1

0 <= 0
0 <= 1

0 >= 0
0 >= 1


"test" == "test"
"test" == "nottest"
"test" == "Test".lowercased()
"Test".lowercased()

"test" != "nottest"

if 15 % 5 == 0 {
    print("success")
} else {
    print("fail")
}

"Hello " + "world"

// MARK: Boolean Logical Operators
// && : and of two booleans ( true && true == true  true && false  == false )
// || : booean or of two boleans ( true || true == true  true || false == true )
// ! : boolean not of something : !true == false  !false == true

true == true
(true && true) == true
(true && false) == true
((0 < 1) && (0 > -1) && (0 == 0)) == true

true == true
(true || true) == true
(true || false) == true

true || false

!(true && false)

!true
!false

if !(15 % 5 == 0) {
    print ("failure")
}