
Sorting Algorithm

This is a sorting algorithm.   It may be applied to a set of data in order to sort it.    
For comparing various sorts, see compare sorts.  
For other sorting algorithms,   see sorting algorithms,   or:

O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Quick sort
O(n log2n) sorts
Shell Sort
O(n2) sorts
Bubble sort |
Cocktail sort |
Cocktail sort with shifting bounds |
Comb sort |
Cycle sort |
Gnome sort |
Insertion sort |
Selection sort |
Strand sort
other sorts
Bead sort |
Bogo sort |
Common sorted list |
Composite structures sort |
Custom comparator sort |
Counting sort |
Disjoint sublist sort |
External sort |
Jort sort |
Lexicographical sort |
Natural sorting |
Order by pair comparisons |
Order disjoint list items |
Order two numerical lists |
Object identifier (OID) sort |
Pancake sort |
Quickselect |
Permutation sort |
Radix sort |
Ranking methods |
Remove duplicate elements |
Sleep sort |
Stooge sort |
[Sort letters of a string] |
Three variable sort |
Topological sort |
Tree sort




Task

Sort an integer array with the   radix sort algorithm.

The primary purpose is to complete the characterization of sort algorithms task.




object RadixSort extends App {
  def sort(toBeSort: Array[Int]): Array[Int] = { // Loop for every bit in the integers
    var arr = toBeSort
    for (shift <- Integer.SIZE - 1 until -1 by -1) { // The array to put the partially sorted array into
      val tmp = new Array[Int](arr.length)
      // The number of 0s
      var j = 0
      // Move the 0s to the new array, and the 1s to the old one
      for (i <- arr.indices) // If there is a 1 in the bit we are testing, the number will be negative
        // If this is the last bit, negative numbers are actually lower
        if ((shift == 0) == (arr(i) << shift >= 0)) arr(i - j) = arr(i)
        else {
          tmp(j) = arr(i)
          j += 1
        }
      // Copy over the 1s from the old array
      arr.copyToArray(tmp, j, arr.length - j)
 
      // And now the tmp array gets switched for another round of sorting
      arr = tmp
    }
    arr
  }
 
  println(sort(Array(170, 45, 75, -90, -802, 24, 2, 66)).mkString(", "))
}