Golang golang-numbers (snippet)

Go programming example 'golang-numbers'

golang-numbers

Golang beginners example: golang-numbers

package main

import (
    "fmt"
    "os"
    "strconv"
)

func check(e error) {
    if e != nil {
        panic(e)
    }
}

func main() {
    var input string
    var lstc1 string
    var lstc2 int64

    if len(os.Args) >= 2 {
        input = os.Args[1]
    } else {
        fmt.Println("Enter a number")
        _, err1 := fmt.Scanf("%v", &input)
        check(err1)
    }

    intin, err2 := strconv.ParseInt(input, 10, 0)
    check(err2)

    lstc1 = input[len(input)-1:]
    if intin >= 10 {
        lstc2, _ = strconv.ParseInt(input[len(input)-2:], 10, 0)
    } else {
        lstc2 = 0
    }
    lstc1 = input[len(input)-1:]

    switch {
    case lstc2 > 10 && lstc2 < 20:
        fmt.Printf("%vth\n", intin)
        break
    case lstc1 == "1":
        fmt.Printf("%vst\n", intin)
        break
    case lstc1 == "2":
        fmt.Printf("%vnd\n", intin)
        break
    case lstc1 == "3":
        fmt.Printf("%vrd\n", intin)
        break
    default:
        fmt.Printf("%vth\n", intin)
    }
}

Useful links

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