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How to avoid "Expressions are not allowed at the top level"

I repeatedly failed to code and run, with MacOS Monterey, Xcode and Swift, an app that simply sends "hello world" to the console. The result remained "Expressions are not allowed at the top level". Could anyone fully desribe a simple solution? Thanks in advance

• Swift

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by RD2019.

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Getting colors with printf, C, Xcode, MacOs ?

I need to print texts in various colors, with a program in C under Xcode 10.3 and OSX 10.14.6With printf(" Black, \033[31m Red ");what is printed is all black, and is Black, [31m Red.The same with "033" replaced by "e"Any solution?Help much appreciated

• Objective-C

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