make var in go code example

Example 1: golang set env var

// set env var "FOO" to value "1"
    os.Setenv("FOO", "1")
    // will print "FOO: 1"
    fmt.Println("FOO:", os.Getenv("FOO"))

Example 2: go variables

package main

import "fmt"

var i, j int = 1, 2

func main() {
	var c, python, java = true, false, "no!"
	fmt.Println(i, j, c, python, java)
}