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Array Analysis?????

Posted on 1998-06-15
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Last Modified: 2010-04-04
I have an array with up to 200 numbers in it and need to find out how to go about getting the frequencies of each number in the array. IE.

In the array I have - 1 2 2 3 2 4 3
 i need to write the program that will tell me there are 3 number two's, 1 number one, 2 threes, and one four.

I have used one of those memo thing to collect the numbers and then i convert them into numbers for the array.  

I desperatly need this help before an exam tommorow!!

CAN ANYBODY HELP????????????
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Question by:Dave091277
3 Comments
 
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Expert Comment

by:ronit051397
ID: 1352861
Is there a range to these numbers, I mean, say from 1 to 50?
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Expert Comment

by:pjdb
ID: 1352862
Which version of Delphi?
Do you know the number of value before the start of the process?
Is 200 the absolute maximum of values, or is it only an example?
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Pegasus100397 earned 200 total points
ID: 1352863
Dave, try this:

procedure TForm1.Button1Click(Sender: TObject);
var iIntArray: array[1..7] of integer;
    iCounter: Integer;
    iArrayValue: Integer;
begin
{populate the array}
iIntArray[1] := 1;
iIntArray[2] := 2;
iIntArray[3] := 2;
iIntArray[4] := 3;
iIntArray[5] := 2;
iIntArray[6] := 4;
iIntArray[7] := 3;
{Here we'll use a listbox to display the counts (frequency) of
 each number, we start with a zero count to initialize}
for iCounter := 1 to High(iIntArray)  do
    Begin
    ListBox1.Items.Add('0');
    end;

{Now we scan the array to get the frequency of the numbers}
{Code broken down for simplicity and understanding}
For iCounter := 1 to High(iIntArray) do
   Begin
   iArrayValue := iIntArray[iCounter];
   ListBox1.Items[iArrayValue-1] :=
        IntToStr(StrToInt(ListBox1.Items[iArrayValue-1]) + 1);
   end;

{Done counting, now let's pretty up the results}
For iCounter := 1 to High(iIntArray) do
   Begin
   ListBox1.Items[iCounter-1] :=
            IntToStr(iCounter) + '''s count is ' +
                ListBox1.Items[iCounter-1];

   end;

end;



Good luck with your project!
Pegasus
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