Discussion on: Challenge: find 'Kaprekar numbers'

[Rocky de Vries]

Because I haven't done Groovy for a while. I miss it!

(0..999).each { 
    def square = String.valueOf(it*it)
    def len = square.length()
    square = len % 2 != 0 ? "0$square" : square
    square = square.replaceAll(/.*0+$/,'')
    len = square.length()
    def half = Integer.valueOf((len / 2).toString())
    def side1 = square.substring(0, half)
    def side2 = square.substring(half)
    if (side1 && side2 && Integer.valueOf(side1) + Integer.valueOf(side2) == it) {
        println it
    }
}