gistfile1.txt

import UIKit
class Oven {
    var _temperature:Temperature = Temperature()
    var temperature :Temperature {
        get {return _temperature}
        set { _temperature = newValue.copy() }
    }
}
class House {
    var thermostat :Temperature?
    var oven : Temperature?
    }

class Temperature {
    var celsius:Double = 0
    var fahrenheit :Double {
        get { return celsius * 9 / 5 + 30}
        set {celsius = (newValue - 32)}
    }
    }
let home = House()
let temp = Temperature()
temp.fahrenheit = 75
home.thermostat
let day :Double = 72
print(day)