51 lines
1.3 KiB
Kotlin
51 lines
1.3 KiB
Kotlin
// version 1.1.2
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fun multDigitalRoot(n: Int): Pair<Int, Int> = when {
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n < 0 -> throw IllegalArgumentException("Negative numbers not allowed")
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else -> {
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var mdr: Int
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var mp = 0
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var nn = n
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do {
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mdr = if (nn > 0) 1 else 0
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while (nn > 0) {
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mdr *= nn % 10
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nn /= 10
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}
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mp++
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nn = mdr
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}
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while (mdr >= 10)
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Pair(mdr, mp)
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}
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}
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fun main(args: Array<String>) {
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val ia = intArrayOf(123321, 7739, 893, 899998)
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for (i in ia) {
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val (mdr, mp) = multDigitalRoot(i)
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println("${i.toString().padEnd(9)} MDR = $mdr MP = $mp")
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}
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println()
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println("MDR n0 n1 n2 n3 n4")
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println("=== ===========================")
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val ia2 = Array(10) { IntArray(6) } // all zero by default
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var n = 0
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var count = 0
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do {
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val (mdr, _) = multDigitalRoot(n)
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if (ia2[mdr][0] < 5) {
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ia2[mdr][0]++
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ia2[mdr][ia2[mdr][0]] = n
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count++
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}
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n++
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}
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while (count < 50)
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for (i in 0..9) {
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print("$i:")
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for (j in 1..5) print("%6d".format(ia2[i][j]))
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println()
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}
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}
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