// Package armstrong handler Armstrong numbers.
package armstrong
import (
	"math"
)
// IsNumber returns true if input is an Armstrong number.
func IsNumber(input int) bool {
	digits := []int{}
	func(in int) {
		for in != 0 {
			// order reversed, does not matter this case
			digits = append(digits, in%10)
			in /= 10
		}
	}(input)
	var sum int
	for _, d := range digits {
		sum += int(math.Pow(float64(d), float64(len(digits))))
	}
	if sum == input {
		return true
	}
	return false
}