programming-examples/c-sharp/Sorting/C# Program to Implement Quick Sort.cs

/*
 *  C# Program to Implement Quick Sort
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace sortQuick
{
class quickSort
{

    private int[] array = new int[20];
    private int len;

    public void QuickSort()
    {
        sort(0, len - 1);
    }

    public void sort(int left, int right)
    {
        int pivot, leftend, rightend;
        leftend = left;
        rightend = right;
        pivot = array[left];
        while (left < right)
            {
                while ((array[right] >= pivot) && (left < right))
                    {
                        right--;
                    }
                if (left != right)
                    {
                        array[left] = array[right];
                        left++;
                    }
                while ((array[left] <= pivot) && (left < right))
                    {
                        left++;
                    }
                if (left != right)
                    {
                        array[right] = array[left];
                        right--;
                    }
            }
        array[left] = pivot;
        pivot = left;
        left = leftend;
        right = rightend;
        if (left < pivot)
            {
                sort(left, pivot - 1);
            }
        if (right > pivot)
            {
                sort(pivot + 1, right);
            }
    }

    public static void Main()
    {
        quickSort q_Sort = new quickSort();
        int[] array = { 4, 3, 1, 4, 6, 7, 5, 4, 32, 5, 26, 187, 8 };
        q_Sort.array = array;
        q_Sort.len = q_Sort.array.Length;
        q_Sort.QuickSort();
        for (int j = 0; j < q_Sort.len; j++)
            {
                Console.WriteLine(q_Sort.array[j]);
            }
        Console.ReadKey();
    }
}
}
/*
1
3
4
4
4
5
5
6
7
8
26
32
187