import java.io.*;
import java.util.*; 

public class qsort
{

        /*
         * My print out data to screen
         *
         */
        public static void PrintData(int array[], int elements)
        {
                int Counter,Line,SkipLine,i;
                Counter=0;
                Line=1;
                SkipLine=10;
                System.out.print("Line #");
                System.out.print(Line);
                System.out.print(".: ");

                for (i=0; i<elements; i++)
                {
                   if(Counter<SkipLine)
                   {
                        Counter++;
                   }
                   else
                   {
                        Counter=1;
                        Line++;
                        System.out.println();
                        System.out.print("Line #");
                        System.out.print(Line);
                        System.out.print(".: ");
                   }
                   System.out.print(array[i]+" ");
                }
                System.out.println();
        }
        /*
         * Ein einfaches, zweiteiliges QuickSort
         */
        public void Quick(int array[], int elements)
        {
                q_sort(array, 0, elements-1);
        }
        private void q_sort(int array[], int links, int rechts)
        {
                int tmp, i, j, x;
                x = array[(links+rechts)/2];
                i = links;
                j = rechts;

                do
                {
                        while (array[i]<x) i++;
                        while (array[j]>x) j--;

                        if (i<j)
                        { // SWAP
                                tmp = array[i];
                                array[i] = array[j];
                                array[j] = tmp;
                        }

                        if (i<=j)
                        {
                                i++;
                                j--;
                        }
                }
                while (i<=j);

                if (links<j)  q_sort(array, links, j);
                if (i<rechts) q_sort(array, i, rechts);
        }

        /*
         * nochmal QuickSort in leicht angeaenderter Form
         */
        public void Quick2(int array[], int left, int right)
        {
                int i, j, tmp;
                if (right>left)
                {
                        i = left-1;
                        j = right;
                        do
                        {
                                do i++; while (array[i]<array[right]);
                                do j--; while (array[j]>array[right] && j>0);

                                { // SWAP
                                        tmp = array[i];
                                        array[i] = array[j];
                                        array[j] = tmp;
                                }
                        }
                        while (j>i);

                        array[j] = array[i];
                        array[i] = array[right];
                        array[right] = tmp;
                        Quick2(array, left, i-1);
                        Quick2(array, i+1, right);
                }
        }

        /*
         * Ein iteratives QuickSort
         *
         * TODO: habe ich die obere Schranke fuer die Groesse des Stack
         * richtig bestimmt?
         */
        public void iQuick(int array[], int elements)
        {
                int left=0, right=elements-1, top=0;
                int sSize = (int)Math.ceil(Math.log(elements)/Math.log(2));
                int lStack[] = new int[sSize];
                int rStack[] = new int[sSize];
                int tmp;
                int i, j, x;

                lStack[top] = left; rStack[top] = right;

                while (top >= 0)
                {
                        left = lStack[top];
                        right = rStack[top];
                        top--;

                        while (left < right)
                        {
                                i = left;
                                j = right;
                                x = array[(left+right)/2];

                                while (i <= j)
                                {
                                        while (array[i] < x) i++;
                                        while (array[j] > x) j--;

                                        if (i<=j)
                                        {
                                                { // SWAP
                                                        tmp = array[i];
                                                        array[i] = array[j];
                                                        array[j] = tmp;
                                                }
                                                i++;
                                                j--;
                                        }
                                }

                                if (j-left < right-i)
                                {
                                        if (i < right)
                                        {
                                                top++;
                                                lStack[top] = i;
                                                rStack[top] = right;
                                        }
                                        right = j;
                                }
                                else
                                {
                                        if (left < j)
                                        {
                                                top++;
                                                lStack[top] = left;
                                                rStack[top] = j;
                                        }
                                        left = i;
                                }
                        }
                }
        }


    /*
     * Main Program
     * By : Mr.Somkieat Sontiwattrakul
     * Create Date : 02/09/2002
     * Update Date : 04/09/2002
     */
        public static void main(String[] Args)
        {

    //
    // Input value [1-1000] from keyboard
    //
    int i,MaxValue=0; 
    char c; 
    InputStreamReader is = new InputStreamReader( System.in ); 

    // Wrap input with a BufferReader to get 
    // the readln() method to read a whole line at once. 
    BufferedReader br = new BufferedReader( is ); 

    // String Tokenizer will split string using white space 
    // as the tokens. 
    StringTokenizer st; 

    System.out.println( "<-------------------------------------------->"); 
    System.out.println( "< Project#1 : Quick Sort in Java Programming >");
    System.out.println( "<-------------------------------------------->"); 
    System.out.print( "Input value [1-1000] : "); 
    try { 
      String s = br.readLine(); // Read the whole line 
      st = new StringTokenizer(s); 
      // With tokenizer nextToken() method we can ignore 
      // any beginning and trailing white space. 
      //System.out.println("Read Line:["+s+"]");
      int len=s.length();
      //System.out.println(len);
      if(len>0)
      {
      //System.out.println("Transger :["+st+"]");
      MaxValue=Integer.parseInt(st.nextToken());//Convert string to int 
      //System.out.println( "got value: " + MaxValue );
      }

    } catch (IOException ioe) { 
               System.out.println( "IO error:" + ioe ); 
    }
    //
    // Check range of Number to be 1 - 1000
    //
        String msg;
        if(MaxValue==0)
         {
         msg="Good bye.";
         System.out.println(msg);
         }
        else if(MaxValue<1)
         {
         msg="Number is less than 1. Try again";
         System.out.println(msg);
         }
        else if(MaxValue>1000)
         {
         msg="Number is more than 1000. Try again";
         System.out.println(msg);
         }
        else
         {
         msg="Number is correct.";        
    //
    //
    //
                int SortierFeld[] = new int[MaxValue];
                int sel=0;
                qsort S = new qsort();
                Random rand = new Random(System.currentTimeMillis());

                System.out.println("---> Before : Sort");

                for (i=0; i<SortierFeld.length; i++)
                        SortierFeld[i] = Math.abs(rand.nextInt()) % 256;
    //
    // Print all data before Sort.
    //
                PrintData(SortierFeld,SortierFeld.length);
                System.out.print("---> Press [Enter] to contiunous: ");
   //
   // Wait for press Enter key to continous
   //
                try {
                  sel=System.in.read();
                } catch(Exception e)
                {System.out.println("Error");}

                System.out.println("---> Sorting !!! Option #1");
   //
   // Begin Sorting -> Select option of QuickSort
   //
                S.Quick(SortierFeld,SortierFeld.length);
                //S.Quick2(SortierFeld,0,SortierFeld.length-1);
                //S.iQuick(SortierFeld,SortierFeld.length);
    //
    // Print all data after Sort.
    //
                System.out.println("---> After  : Sort");
                PrintData(SortierFeld,SortierFeld.length);
    //
    // Finish.
    //
                System.out.println("---> Finish.");
        }
        }
}
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