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Groups > comp.lang.pascal.delphi.misc > #624

Re: display array values in a label

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Sandeepan Kashyap schrieb:
> Thanks DoDi,
> 
> I am actually an experienced Mumps/Cache developer and have to learn
> Delphi for a new project. I am actually trying to print a series of
> number in ascending order, e.g. 1,2,3,4,5,6,7,8,9 but in every number
> should print in new followed line. like
> 1
> 2
> 3
> ..

Let's look into this later, it depends on what you mean by "printing".
When you want to show multiple lines on a form, use a TListBox or TMemo, 
not an TLabel.

> I tried the below code. But the below code printing '0' always inside Label3, don't know why? what's is wrong with the code. Please enlighten me.
> 
> type
>   TIntegerArray = Array[1..9] of Integer;
> var
>    x,y : integer;
>   txt: string;
>   i: integer;
>   arrayOfIntegers : TIntegerArray;
> begin
>     Form1.Color := clGreen;
>     x := StrToInt(Edit1.Text);
>     y := StrToInt(Edit2.Text);
> 
>     i := 1 ;
>     begin
>       while (i = 9) do
>       arrayOfIntegers[i] :=  i;
>       Inc(i);
>     end;

Can you answer these questions:
What's the value of i here?
What's the value of arrayOfIntegers[i]?

>       Label3.Caption :=      IntToStr(arrayOfIntegers[i]);

Please try to learn how to use the Delphi debugging features. When you 
put an breakpoint somewhere in this procedure, e.g. on "i := 1;", you 
can step through the following code and inspect all variables by moving 
the mouse pointer over the name of a variable. It even will show you the 
content of arrayOfIntegers[i], depending on the current value of i.

Then you'll find that the array is not initialized, because the condition in
   while (i = 9) do ...
is never True.

Okay, this may be a typo, should read (i <= 9) instead?
Please fix this and try again.


Finally I assume that you expect too much from IntToStr(), in case you 
want to display *all* array elements at once. That doesn't work, for two 
reasons:
- IntToStr only converts an single value
- arrayOfInteger[i] is a single value, not the entire array

You need another loop over the array, adding the values to an result 
string or to a ListBox control.

DoDi

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display array values in a label Sandeepan Kashyap <sandeepan1982@gmail.com> - 2014-09-11 04:02 -0700
  Re: display array values in a label Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2014-09-11 15:44 +0200
    Re: display array values in a label Sandeepan Kashyap <sandeepan1982@gmail.com> - 2014-09-11 23:24 -0700
      Re: display array values in a label Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2014-09-12 18:01 +0200
        Re: display array values in a label Sandeepan Kashyap <sandeepan1982@gmail.com> - 2014-09-15 02:34 -0700
          Re: display array values in a label Sandeepan Kashyap <sandeepan1982@gmail.com> - 2014-09-15 02:36 -0700
          Re: display array values in a label Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2014-09-15 14:14 +0200
  Re: display array values in a label "Alan Lloyd" <alanglloyd@NotThisBitbtinternet.com> - 2014-09-25 11:51 +0100
    Re: display array values in a label Sandeepan Kashyap <sandeepan1982@gmail.com> - 2014-09-26 05:58 -0700
      Re: display array values in a label "Alan Lloyd" <alanglloyd@NotThisBitbtinternet.com> - 2014-09-26 19:53 +0100

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