Essential Go / Constants
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package main
import (
"fmt"
"math"
)
const s string = "constant"
func main() {
fmt.Println(s) // constant
// A `const` statement can appear anywhere a `var` statement can.
const n = 10
fmt.Println(n) // 10
fmt.Printf("n=%d is of type %T\n", n, n) // n=10 is of type int
const m float64 = 4.3
fmt.Println(m) // 4.3
// An untyped constant takes the type needed by its context.
// For example, here `math.Sin` expects a `float64`.
const x = 10
fmt.Println(math.Sin(x)) // -0.5440211108893699
}
Go
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