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<code> , adding modules: , , The go tool with module support automatically downloads and installs dependencies. But for it to work, you must initialize your module. , , Its not enough to save the source in a .go file and run with go run hello.go, a go.mod file must exist. , , To init your module, do as indicated in the tutorial: , , go mod init hello , </code> , <code> , declaring data type: , , var i int = 1 , , i := 1 , , </code> , <code> , constants: , const str = DQhello worldDQ , </code>