Constants are declared like variables, but with the const keyword.
const
Constants can be character, string, boolean, or numeric values.
Constants cannot be declared using the := syntax.
:=
package main
import "fmt"
const Pi = 3.14
func main() {
const World = "世界"
fmt.Println("Hello", World)
fmt.Println("Happy", Pi, "Day")
const Truth = true
fmt.Println("Go rules?", Truth)
}