18032019_2

import Foundation

enum Direction: CustomStringConvertible{
    case north
    case south
    case east
    case west

    var description:String{
        switch self {
            case .north:
                return "north"
            case .south:
                return "south"
            case .east:
                return "east"
            case .west:
                return "west"

        }
    }
}

let d:Direction = .north
print (d)


let d2:Direction = .south
print (d2)




enum Element: CustomStringConvertible{
    case fire, water, earth, air

    var weakElem:Element{
         switch self {
            case .fire:
                return .water
            case .water:
                return .earth
            case .earth:
                return .air
            case .air:
                return .fire
         }
    }

    var description:String{
         switch self {
            case .fire:
                return "fire"
            case .water:
                return "water"
            case .earth:
                return "earth"
            case .air:
                return "air"
         }
    }
}

let elem:Element = .fire
print(elem)
print(elem.weakElem)



enum Trade{
    case buy(stock:String, amount:Int)
    case sell(stock:String, amount:Int)
}

let myTrade:Trade = .buy(stock: "AAPL", amount: 3)

print(myTrade)