swift错误 Expressions are not allowed at the top level

```

... 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”.

```

缘由就是你把print等等表达式放到其余文件去了。在main.swift这个文件中写就没问题

知道怎么改就能够了。若是不知足的话，能够看看上面这段官方代码，写得真好

文／把时间当作朋友（简书做者） 原文连接：http://www.jianshu.com/p/6bc97afd9478 著做权归做者全部，转载请联系做者得到受权，并标注“简书做者”。