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“In an if statement, the conditional must be a Boolean expression—this means that code such as if score { ... } is an error, not an implicit comparison to zero.” 译文中 “not an implicit comparison to zero”未做翻译。
欢迎使用 Swift
在本章中您将了解 Swift 的特性和开发历史，并对 Swift 有一个初步的了解。