The Go language USES the Luhn algorithm to verify whether the credit card number is valid or not

In this paper, an example is given to verify the validity of credit card number in Go via Luhn algorithm. Share with you for your reference. The specific implementation method is as follows:

package main

import (

    "fmt"

    "strings"

)

const input = `49927398716

49927398717

1234567812345678

1234567812345670`

var t = [...]int{0, 2, 4, 6, 8, 1, 3, 5, 7, 9}

func luhn(s string) bool {

    odd := len(s) & 1

    var sum int

    for i, c := range s {

        if c < '0' || c > '9' {

            return false

        }

        if i&1 == odd {

            sum += t[c-'0']

        } else {

            sum += int(c - '0')

        }

    }

    return sum%10 == 0

}

func main() {

    for _, s := range strings.Split(input, "\n") {

        fmt.Println(s, luhn(s))

    }

}

The output

49927398716 true

49927398717 false

1234567812345678 false

1234567812345670 true

I hope this article has been helpful to you in the programming of Go language.