package main

import (
	"fmt"
	"math"
)

//const declares a constant value.
const s string = "constant"

func main(){
	fmt.Println(s)
	// A const statement can appear anywhere a var statement can.
	const n = 500000000
	// Constant expressions perform arithmetic with arbitrary precision.
	const d = 3e20 / n
	// A numeric constant has no type until it’s given one, such as by an explicit conversion.
	fmt.Println(int64(d))
	// A number can be given a type by using it
	// in a context that requires one, such
	// as a variable assignment or function call.
	// For example, here math.Sin expects a float64.
	fmt.Println(math.Sin(n))
}