 
 print(theString)
 
-//: ##### I would recommend that you always prefer let over var.
+//: ##### I would recommend that you prefer let over var.
 
 //: ### What is the difference between instances of Structs and Classes?
 

if let aString = optionalString {
    print(aString)
}

//: After an optional value has been assigned a value you can set it back to nil.


}

let myCity = City(cityName:"Sheffield", population: 525000)
// var myCity = City(cityName:"Sheffield", population: 525000)
// myCity.name = "Chesterfield"

myCity.printCity()
