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Bubble Sort - Accending and Deccending Order ?

Posted on 2000-04-13
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Last Modified: 2008-01-09
Hello,

I need some help on figuring out how to use a bubble sort method, to arrange all the numbers that a user enters in for (Number[x]) , in accending and deccending order.

Any help would be greatly appreciated.




-----------------------------

Program AccArray;


Uses CRT, dos;

Var   Number: array [1..5] of integer;
      Arr: array [1..100] of integer;
      numbers,numtotal,x,prevnumber,max,i,j:integer;
      ans,Yes,No:char;



Begin

  Repeat

        clrscr;

        numtotal:= 0 ;

        Repeat
               write('How many numbers (maximum = 100)? ') ;
               readln(numbers);
               writeln;

                 Begin
                   If numbers > 100 then
                      Begin
                        writeln('ERROR - Please enter a number between 1 and 100') ;
                        writeln;
                      End
                 End;

                 Begin
                   If numbers < 1 then
                     Begin
                       writeln('ERROR - Please enter a number between 1 and 100' );
                       writeln;
                     End
                 End;

                 Begin
                   If numbers < 101 then
                     If numbers > 0  then
                      numtotal:= 5;
                 End;



             Until numtotal = 5  ;



       For x:= 1 to numbers do
       Begin

         write('Enter  # ' , x  ,  ' : '  ) ;
         readln(Number[x]) ;

       End;

       writeln;


{

I need some kind of bubble sort code in here, to arrange the numbers I entered for Number[x] in accending and deccending order.

}

       





                writeln;
                Write ('Would you like to enter more numbers (Y/N)? ') ;
                readln (ans);
                writeln;


  Until ans = 'N' ;





End.
0
Comment
Question by:R_K
5 Comments
 

Expert Comment

by:psychorakz
Comment Utility
http://www.cs.adfa.oz.au/teaching/studinfo/ada/Searching/bubble_sort.html
all you'll need, info/algorithem/source
enjoy
   -kay
0
 
LVL 6

Accepted Solution

by:
My name is Mud earned 200 total points
Comment Utility
Program BubbleSort;
Uses
  Crt;
Type
  PointerToList = ^List;
  List = Record
    Value: Integer;
    PrevItem: PointerToList;
    NextItem: PointerToList;
  End;
Var
  Start,Previous,Current,Finish: PointerToList;
  mValue: Integer;

{ Function to count the number of items in the list.}
Function Count_Items: Integer;
Var
  I: Integer;
Begin
  Current:=Start;
  I:=0;
  While Current <> Nil Do
    Begin
      I:=I+1;
      Current:=Current^.NextItem;
    End;
  Count_Items:=I;
End;

{ Procedure to add items into the list }
Procedure AddItem (Newvalue: Integer);
Begin
  {Check If this is the first time the structure is going to be created}
  If Current = NIL Then
    Begin
      New(Current); {Get memory for the data}
      With Current^ do  {Fill in the data}
        Begin
          Value:=NewValue;
          NextItem:=NIL; {Since there are any more Up this points NIL}
          PrevItem:=NIL  {Since there are any more Down this points NIL}
        End;
      Start:=Current;
      Finish:=Current
    End
  Else  {Now this is not the first time}
    Begin
      New(Finish);
      Finish^.PrevItem:=Current; {Current <- Finish}
      Finish^.NextItem:=NIL;     {Finish -> Nil}
      Current^.NextItem:=Finish; {Current -> Finish}
      Current:=Finish;       {Current:=Finish}
      With Current^ do  {Fill in the data}
        Begin
          Value:=NewValue;
        End
    End
End;

{ Procedure to sort the list using the bubble sort method }
Procedure Sort_List;
Var
  Index1,Index2: Integer;
  MaxNum: Integer;

  Procedure ChangePlaces(Var Prev,Curr: PointerToList);
  Var
    Temp: Integer;
  Begin
    Temp:=Prev^.Value;
    Prev^.Value:=Curr^.Value;
    Curr^.Value:=Temp;
  End;

Begin
  MaxNum:=Count_Items;
  Previous:=Start;
  Current:=Finish;
  For Index1:=1 To MaxNum-1 Do
    Begin
      For Index2:=MaxNum DownTo Index1+1 Do
        Begin
          If Previous^.Value > Current^.Value Then
            ChangePlaces(Previous,Current);
          Current:=Current^.PrevItem;
        End;
      Previous:=Previous^.NextItem;
      Current:=Finish;
    End
End;

{ Procedure to print the list }
Procedure Print_List;
Begin
  Current:=Start;
  While Current <> Nil Do
    Begin
      Write(Current^.Value,'  ');
      Current:=Current^.NextItem;
    End
End;

Procedure Dispose_All;
Begin
  Current:=Start;
  While Current^.NextItem <> Nil Do
    Begin
      Previous:=Current;
      Current:=Current^.NextItem;
      If Previous <> Nil Then
        Dispose(Previous);
    End;
  Dispose(Current);
End;

{ The main program }
Begin
  ClrScr;
  Start := Nil;
  { Adding items to the list }
  Repeat
    Write (' Enter a Number : ');
    Readln (mValue);
    If mValue <> 0 Then
      AddItem (mValue);
  Until mValue = 0;
  { Sorting the list }
  Sort_List;
  { Printing the list }
  Print_List;
  Dispose_All;
End.
0
 

Expert Comment

by:DU
Comment Utility
Thanks a lot guys, that really helped me out.

Also whatboy, thanks for taking the time to give me an example, I really appreciate it!

0
 

Author Comment

by:R_K
Comment Utility
opps, wrong user name :)

Thanks again!
0
 

Author Comment

by:R_K
Comment Utility
The finished version of my program.

Thanks to psychorakz, whatboy, and my good friend Benjamin!

--------------------------
Program AccArray;


Uses CRT, dos;

Var   Number: array [1..5] of integer;
      numbers,numtotal,x,prevnumber,max,i,j:integer;
      ans,Yes,No:char;



Begin

  Repeat

        clrscr;

        numtotal:= 0 ;

        Repeat
               write('How many numbers (maximum = 100)? ') ;
               readln(numbers);
               writeln;

                 Begin
                   If numbers > 100 then
                      Begin
                        writeln('ERROR - Please enter a number between 1 and 100') ;
                        writeln;
                      End
                 End;

                 Begin
                   If numbers < 1 then
                     Begin
                       writeln('ERROR - Please enter a number between 1 and 100' );
                       writeln;
                     End
                 End;

                 Begin
                   If numbers < 101 then
                     If numbers > 0  then
                      numtotal:= 5;
                 End;



             Until numtotal = 5  ;



       For x:= 1 to numbers do
       Begin

         write('Enter  # ' , x  ,  ' : '  ) ;
         readln(Number[x]) ;

       End;

       writeln;

             Begin
               for i:= 1 to 100 do
                   for x:= 1 to numbers do
                       if number[x] = i then
                           writeln('Ascending Order - Array  ' , x , ' equals ' , i );
             End;

             writeln;

             Begin
                for i:= 100 downto 1 do
                   for x:= 1 to numbers do
                       if number[x] = i then
                           writeln('Descending Order - Array  ' , x , ' equals ' , i );
             End;




                writeln;
                Write ('Would you like to enter more numbers (Y/N)? ') ;
                readln (ans);
                writeln;


  Until ans = 'N' ;





End.


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