The main function and the Init function in Go

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Gothere are two reserved functions in it:Initfunction (which can be applied to all Package) andMainfunction (can only be applied toPackage Main). These two functions cannot have any parameters and return values when they are defined. Although a Packageyou can write any number ofInitfunction, but for readability or later maintainability, we strongly recommend that users Packagein each file, write only oneInitfunction.

GoThe program will automatically callInit ()and theMain (), so you don't need to call these two functions anywhere. Each Packagein theInitfunctions are optional, butPackage MainYou must include aMainfunction.

the initialization and execution of the program starts atMainpackage. IfMainpackages are also imported into other packages, they are imported sequentially at compile time. Sometimes a package is imported at the same time by multiple packages, so it will only be imported once (for example, many packages may be usedFMTpackage, but it will only be imported once, because there is no need to import more than once). When a package is imported, if the package also imports other packages, the other packages are imported, and then the package-level constants and variables in those packages are initialized and then executedInitfunction (if any), and so on. When all the imported packages have been loaded, you will start toMainPackage -level constants and variables in the package are initialized, and then execute theMainin the packageInitfunction (if present), the last executionMainfunction. Explains the entire execution process in detail:

• go" in the main function and the init function
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