Golang Basic 1 - Install && Hello World

What is Golang

• Official website: https://golang.org/
• Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

How to install

• Download link: https://golang.org/dl/
• Build from source code: Installing Go from source
• Windows installer: https://golang.org/dl/
• Ubuntu apt:
add-apt-repository ppa:longsleep/golang-backports
apt update
apt install golang-go -y


Comments

• 3 way to write a comments in go program.

• // this is a single line comment
  

• /*
  this is a
      multi line
          comment
  */
  

Hello World

usr@host:go/ # cat hello.go
package main    // if you want to run this program
import "fmt"    // import some build in packages, fmt is a packag e for print something on the screen
func main(){    // the main function, the entry of the program
    fmt.Println("Hello world.!")    // call fmt.Println to print something on the screen
}
usr@host:go/ # go build hello.go    # build the program
usr@host:go/ # ./hello  # run it
Hello world.!