1th Lesson Go Basics

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//The package name of the current program PackageMain//Import Other packagesImport("FMT"    //"OS"    //"strings"    //"Time")//Definition of constantsConst(PI =3.14)//Declaration and assignment of global variablesvarName ="Gopher"//general type of declarationtypeNameTypeint//Statement of StructuretypeGopherstruct{}//Declaration of the interfacetypeGolangInterface{}//initiated by the main function as a program entry pointfuncMain () {FMT. Println (Hello world!, the world! ")}//go uses casing to determine whether the constant, variable, type, interface, struct, or function can be called externally//according to convention, the first letter lowercase is private, uppercase is public