decompose_number.go

package main

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

func main() {
	input, _ := strconv.Atoi(os.Args[1])
	output := []int{}
	numDigits := len(strconv.Itoa(input))
	for i := numDigits - 1; i > 0; i-- {
		power := int(math.Pow10(i))
		part := (input / power) * power
		output = append(output, part)
		input -= part
	}
	output = append(output, input)
	fmt.Println(output)
}