Editbox help

Hi, im new to the fun world of C++, learning it gradually as i go...

i have figured how to use the data the user enters in to an editbox like so

Code:

if(CheckBox21->Checked)
{
wac<<"if never() then"<<endl;
wac<<"breathtime ="<<Edit3->Text.c_str()<<endl;
wac<<"endif"<<endl;
wac<<endl;
}

but what i would like to do, is divide the users input by half.

so if they enter 20, it will create

if never() then
breathtime = 10
endif

in the wac file.

any help with this would be appreciated

Edit:

ive added this to the "on key press" of the editbox

Code:

void __fastcall TForm1::Edit2KeyPress(TObject *Sender, char &Key)
{
if ((Key < 48 || Key > 57) && Key != 8) Key = 0;
}

so now only numerical datacan be entered.... just leaves the division

Code:

#include<cstdlib>

//Convert from CString to int, then divide by 2
wac<<"breathtime ="<< atoi(Edit3->Text.c_str()) / 2 <<endl;

http://faq.cprogramming.com/cgi-bin/...&id=1043284385
And maybe http://faq.cprogramming.com/cgi-bin/...&id=1043284385

Thanks alot for your help . il read through the FAQ's before posting again.