test 

var implicitInteger = 70
implicitInteger = 70.0
let explicitDouble: Double = 70
println("constant double value: \(explicitDouble)")
println("variable integer value: "+String(implicitInteger))

　　

posted @ 2015-06-29 10:22  rongbin  阅读(86)  评论(0)  编辑  收藏  举报