Solved

Urgent! Adding 2 numbers

Posted on 2006-10-19
2
212 Views
Last Modified: 2010-04-05
Hello expert.  Still an idiot with delphi and programming.
I need to read 2 numbers (num1 and num2) from the 2 TEdit box, add 700 to the  subtotal and display them in the text label.  
So far, I cannot read num2 in the 2nd tEdit box.
Please help
Thanks

Part of my code:
procedure TForm3.Button1Click(Sender: TObject);
var
num1, num2, total: double;
errcode : integer;
begin
Val(Edit1.Text, num1, Edit2.Text,  errcode );
if errcode <> 0 then
ShowMessage('You must enter a number!')
else
begin
total := num1 + num2 + 700;
Caption := 'Total = $' + FloatToStr(total);
Label1.Caption := 'The result is:  $'+ FloatToStr(Total);
end;
0
Comment
Question by:lidiii
2 Comments
 
LVL 21

Accepted Solution

by:
ziolko earned 500 total points
ID: 17764415
procedure TForm3.Button1Click(Sender: TObject);
var
num1, num2, total: double;
errcode : integer;
begin
Val(Edit1.Text, num1, errcode );
if errcode = 0 then then begin
  Val(Edit2.Text, num2, errcode );  
  if errcode = 0 then begin
    Label1.CAption := Format('The result is: $%n', [num1 + num2 + 700]);
  end else begin
    ShowMessage('You must enter a number into Edit2!')
  end
end else
  ShowMessage('You must enter a number into Edit1!');

ziolko.
0
 
LVL 19

Expert Comment

by:MerijnB
ID: 17764513
why use val if you have TryStrToFloat?

uses SysUtils;

...

procedure TForm3.Button1Click(Sender: TObject);
var num1, num2, total: double;
begin
 if (TryStrToFloat(Edit1.Text, num1) and (TryStrToFloat(Edit2.Text, num2) then
  Label1.CAption := Format('The result is: $%n', [num1 + num2 + 700])
 else
  ShowMessage('not a valid number');
end;
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now