Golang golang-iota (snippet)

Go programming example 'golang-iota'

golang-iota

Golang beginners example: golang-iota

package main

import (
    "fmt"
)

type Day int

const (
    SUNDAY Day = iota
    MONDAY
    TUESDAY
    WEDNESDAY
    THURSDAY
    FRIDAY
    SATURDAY
)

func day() {
    fmt.Printf("Monday has the value %d\n", MONDAY)
    fmt.Printf("Friday has the value %d\n", FRIDAY)
}

type Days int

const (
    SUNDAYS Days = 1 << iota
    MONDAYS
    TUESDAYS
    WEDNESDAYS
    THURSDAYS
    FRIDAYS
    SATURDAYS
)

func days(d Days) {
    fmt.Print("\nYou selected these days:\n")

    if d&SUNDAYS != 0 {
        fmt.Print("* SUNDAY\n")
    }
    if d&MONDAYS != 0 {
        fmt.Print("* MONDAY\n")
    }
    if d&TUESDAYS != 0 {
        fmt.Print("* TUESDAY\n")
    }
    if d&WEDNESDAYS != 0 {
        fmt.Print("* WEDNESDAY\n")
    }
    if d&THURSDAYS != 0 {
        fmt.Print("* THURSDAY\n")
    }
    if d&FRIDAYS != 0 {
        fmt.Print("* FRIDAY\n")
    }
    if d&SATURDAYS != 0 {
        fmt.Print("* SATURDAY\n")
    }
}

func main() {
    day()

    days(34)

    days(MONDAYS | FRIDAYS)

    days(5)

    days(127)
}

Useful links

• Learn Go: https://golangr.com
• Download Go: https://golang.org