摘要：
let Constant var Variable
let implicitInteger = 70
let implicitDouble = 70.0
let explicitDouble: Double = 70 The so-called type implications To include value in strings:let fruitSummary = "I have... 阅读全文
摘要：
func &( left:OCBool, right: OCBool)->OCBool{ if left{ return right } else{ return false }
} 阅读全文