Add Selection Sort in Kotlin (#5002)

Implemented selection sort

Author: jrg94

archive/k/kotlin/SelectionSort.kt

@@ -0,0 +1,52 @@
+import kotlin.system.exitProcess
+
+fun main(args: Array<String>) {
+    val nums: IntArray = errorChecking(args)
+    selectionSort(nums)
+    outputList(nums)
+}
+
+fun usageError() {
+    println("Usage: please provide a list of at least two integers to sort in the format \"1, 2, 3, 4, 5\"")
+}
+
+fun errorChecking(args: Array<String>): IntArray {
+    val nums: IntArray
+    try {
+        nums = args[0].split(", ").map { it.toInt() }.toIntArray()
+    } catch (e: Exception) {
+        usageError()
+        exitProcess(1)
+    }
+    if (nums.size < 2) {
+       usageError()
+       exitProcess(1)
+    }
+    return nums
+}
+
+fun selectionSort(nums: IntArray) {
+    for (i in 0 until nums.count() - 1) {
+        
+        var smallestIndex: Int = i
+        for (j in i + 1 until nums.count()) {
+            if (nums[j] < nums[smallestIndex]) {
+                smallestIndex = j
+            }
+        }
+
+        var swap: Int = nums[i]
+        nums[i] = nums[smallestIndex]
+        nums[smallestIndex] = swap
+    }
+}
+
+fun outputList(nums: IntArray) {
+    for (i in nums.indices) {
+        if (i == nums.count() - 1) {
+            println("${nums[i]}")
+            return
+        }
+        print("${nums[i]}, ")
+    }
+}