Go+ supports constants of character, string, boolean, and numeric values.

import ( "math" )

const declares a constant value.

const s string = "constant" 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 println d

A numeric constant has no type until it’s given one, such as by an explicit conversion.

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.

println math.sin(n)

Next example: Variables