instruction: Explain go by example: hello world
output: Go by Example
  : Hello World
  Our first program will print the classic “hello world”
  message. Here’s the full source code.
  package
  main
  import
  "fmt"
  func
  main
  ()
  {
  fmt
  .
  Println
  (
  "hello world"
  )
  }
  To run the program, put the code in
  hello-world.go
  and
  use
  go run
  .
  $
  go run hello-world.go
  hello world
  Sometimes we’ll want to build our programs into
  binaries. We can do this using
  go build
  .
  $
  go build hello-world.go
  $
  ls
  hello-world hello-world.go
  We can then execute the built binary directly.
  $
  ./hello-world
  hello world
  Now that we can run and build basic Go programs, let’s
  learn more about the language.
  Next example:
  Values
  .
  by
  Mark McGranaghan
  and
  Eli Bendersky
  |
  source
  |
  license