43 lines
1.1 KiB
Text
43 lines
1.1 KiB
Text
// version 1.0.6
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infix fun Int.ipow(exp: Int): Int =
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when {
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this == 1 -> 1
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this == -1 -> if (exp and 1 == 0) 1 else -1
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exp < 0 -> throw IllegalArgumentException("invalid exponent")
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exp == 0 -> 1
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else -> {
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var ans = 1
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var base = this
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var e = exp
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while (e > 1) {
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if (e and 1 == 1) ans *= base
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e = e shr 1
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base *= base
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}
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ans * base
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}
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}
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infix fun Double.dpow(exp: Int): Double {
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var ans = 1.0
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var e = exp
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var base = if (e < 0) 1.0 / this else this
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if (e < 0) e = -e
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while (e > 0) {
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if (e and 1 == 1) ans *= base
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e = e shr 1
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base *= base
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}
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return ans
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}
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fun main(args: Array<String>) {
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println("2 ^ 3 = ${2 ipow 3}")
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println("1 ^ -10 = ${1 ipow -10}")
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println("-1 ^ -3 = ${-1 ipow -3}")
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println()
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println("2.0 ^ -3 = ${2.0 dpow -3}")
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println("1.5 ^ 0 = ${1.5 dpow 0}")
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println("4.5 ^ 2 = ${4.5 dpow 2}")
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}
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