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scala power function
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| def pow(n: Int, k:Int): Int = k match { | |
| case kk if kk < 0 => 0 // error | |
| case 0 => 1 | |
| case 1 => n | |
| case 2 => n*n | |
| case kk if kk % 2 == 0 => pow(pow(n, k/2), 2) | |
| case _ => pow(n, k/2)*pow(n, (k+1)/2) | |
| } |
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