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Lets Start With First Hello world Program

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package main

// main package declaration
import "fmt"

// import librares
func main() {
	// declare main function with func keyforword followed by main()
	fmt.Println("Hello World")
	// fmt is fromat
}

// output :- hello_world


Run

  • A complete program is created by linking a single, unimported package called the main package with all the packages it imports, transitively. The main package must have package name main and declare a function main that takes no arguments and returns no value.

    func main() { … }

  • Program execution begins by initializing the main package and then invoking the function main. When that function invocation returns, the program exits. It does not wait for other (non-main) goroutines to complete.


  • Go: Meaning of the ‘fmt’ package acronym
  • fmt is short for format.
  • Package fmt implements formatted I/O with functions analogous to C’s printf and scanf. The format ‘verbs’ are derived from C’s but are simpler.

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