선택정렬 (Selection Sort) C#

using System;

namespace SelectSort {
    class Program {
        static void Main (string[] args) {
            int[] arr = { 4, 1, 5, 3, 2 };
            int smallest;
            int temp;
            for (int i = 0; i < arr.Length - 1; i++) {
                smallest = i;
                for (int j = i + 1; j < arr.Length; j++) {
                    if (arr[j] < arr[smallest]) {
                        smallest = j;
                    }
                }
                temp = arr[smallest];
                arr[smallest] = arr[i];
                arr[i] = temp;
            }

            foreach (var num in arr) {
                Console.WriteLine (num);
            }
        }
    }
}