swift錯誤 Expressions are not allowed at the top level

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... earlier we said top-level code isn’t allowed in most of your app’s source files. The exception is a special file named “main.swift”, which behaves much like a playground file, but is built with your app’s source code. The “main.swift” file can contain top-level code, and the order-dependent rules apply as well. In effect, the first line of code to run in “main.swift” is implicitly defined as the main entrypoint for the program. This allows the minimal Swift program to be a single line — as long as that line is in “main.swift”.

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原因就是你把print等等運算式放到其他檔案去了。在main.swift這個檔案中寫就沒問題

知道怎麼改就可以了。如果不滿足的話，可以看看上面這段官方代碼，寫得真好

文／把時間當做朋友（簡書作者）
原文連結：http://www.jianshu.com/p/6bc97afd9478
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swift錯誤 Expressions are not allowed at the top level