Swift基础---Booleans

let orangesAreOrange = true
let turnipsAreDelicious = false

if turnipsAreDelicious {
  println("Mmm, tasty turnips!")
}else{
  println("Eww, turnips are horrible.")
}


let i = 1
if i {
  // ---error
}

if i== 1 {
  // ---successfully
}