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October 2, 2021 15:00
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| package ru.fbear.arithmetic | |
| import kotlin.math.abs | |
| fun main(args: Array<String>) { | |
| println("Hello World!") | |
| // Try adding program arguments at Run/Debug configuration | |
| println("Program arguments: ${args.joinToString()}") | |
| } | |
| class Arithmetic { | |
| /** | |
| * Subtracting [b] from [a] | |
| * @return Subtraction result. | |
| */ | |
| fun subtraction(a: Int, b: Int): Int = a + negatate(b) | |
| /** | |
| * Multiply [a] by [b] | |
| * @return Result of multiplication. | |
| */ | |
| fun multiply(a: Int, b: Int): Int { | |
| var sum = 0 | |
| for (i in 1..abs(b)) | |
| sum += a | |
| if (b < 0) | |
| sum = negatate(sum) | |
| return sum | |
| } | |
| /** | |
| * Dividing [a] by [b] | |
| * @return Division Result. | |
| */ | |
| fun division(a: Int, b: Int): Int { | |
| if (b == 0) throw IllegalArgumentException("b cannot be 0") | |
| var dividend = abs(a) | |
| val divider = abs(b) | |
| var result = 0 | |
| while (dividend >= divider) { | |
| dividend -= divider | |
| result++ | |
| } | |
| return if ((a < 0 && b < 0) || (a > 0 && b > 0)) result | |
| else negatate(result) | |
| } | |
| private fun negatate(a: Int): Int { | |
| var num = a | |
| var negative = 0 | |
| val x = if (a < 0) 1 else -1 | |
| while (num != 0) { | |
| negative += x | |
| num += x | |
| } | |
| return negative | |
| } | |
| } |
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