Friday, 14 October 2011

Source code for Quick Sort


/********************************************************\
 * ***************                       ************** *
 * *             *       QUICK SORT      *            * *
 * ***************                       ************** *
/********************************************************/


#include <iostream.h>
#include <conio.h>
#include <malloc.h>


int partition(int a[], int p, int r)
{
    int x, i, j, temp;
    x = a[r];
    i = p-1;
    for(j = p; j <= r-1; j++)
    {
       if(a[j] <= x)
       {
        i = i+1;
temp = a[i];
a[i] = a[j];
                a[j] = temp;
       }
    }
    temp = a[i+1];
    a[i+1] = a[r];
    a[r] = temp;
    return (i+1);
}




void quick_sort(int a[], int p, int r)
{
   int q;
   if(p < r)
   {
       q = partition(a, p, r);
       quick_sort(a, p, q-1);
       quick_sort(a, q+1, r);
   }
}


void main()
{
int i, n, p = 0;
        int* a;
  clrscr();
  cout << "Enter  the no of elements: ";
  cin  >> n;
        a = (int*) malloc(sizeof(int)*n);
  cout << "\nEnter the elements:\n\n";
  for(i = 0; i < n; i++)
  {
    cin >> a[i];
  }
  quick_sort(a, p, n);
  cout << "\nSorted array is: ";
  for(i = 0;i < n; i++)
  {
    cout << a[i] << " ";
  }
   getch();
}


Output : 

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