let number: Int? = 42
let nullInt: Int?  = nil
let pi: Double? = 3.14
let charA: Character? = "A"
let hasValue: Bool? = true
let noValue: Bool? = nil

print(number!)
print(String(describing: nullInt))
print(pi!)
print(charA!)
print(hasValue!)
print(String(describing: noValue))