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December 20, 2015 22:08
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// Reverses an integer without using Strings | |
def reverse(n: Int): Int = { | |
val len = math.ceil(math.log10(n+1)).toInt | |
Stream.continually(n).take(len).zipWithIndex | |
.map{ case (m,p) => | |
(m % math.pow(10, len-p) / math.pow(10, len-p-1)).toInt * math.pow(10,p) | |
} | |
.sum.toInt | |
} |
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