[Qt-interest] I am facing a problem

[Thomas Dähling]

I hate repeating myself, but take a look at the QValidator
specializations provided by the Trolls, namely QIntValidator and
QDoubleValidator.

/Thomas

2009/8/12 Sujan Dasmahapatra <sujan.dasmahapatra at gmail.com>:
> I am reading an int and a double from file. Can u tell me how could I check
> whether it's an int or double.
>
> something like
>
>
> int intval;
> double doubleval;
>
> file >> intval  >> doubleval;
>
> // Now I want to check whether it's an int or a junk value and whether it's
> a double or a junk value !!!!!
> How can I check that.
>
> It's a C++ question but is there anythin in Qt  to check the data type ???
>
> On Wed, Aug 12, 2009 at 5:35 PM, Srdjan Todorovic
> <todorovic.s at googlemail.com> wrote:
>>
>> Hi,
>>
>> On 12/08/2009, Sujan Dasmahapatra <sujan.dasmahapatra at gmail.com> wrote:
>> >
>> > ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
>> > int numberOfPoints = 201;
>> > QString testNumberOfPoints = QString::number(numberOfPoints);
>> >  for(i=0; i<testNumberOfPoints.length(); i++)
>> >         {
>> >                 qDebug() << testNumberOfPoints.at(i) << "\n";
>> >                 if(testNumberOfPoints.at(i) != '0' ||
>> > testNumberOfPoints.at(i) != '1' || testNumberOfPoints.at(i) != '2' ||
>> > testNumberOfPoints.at(i) != '3' ||
>> >                 testNumberOfPoints.at(i) != '4' ||
>> >  testNumberOfPoints.at(i)
>> > != '5' ||  testNumberOfPoints.at(i) != '6' || testNumberOfPoints.at(i)
>> > !=
>> > '7' ||
>> >                 testNumberOfPoints.at(i) != '8' ||
>> > testNumberOfPoints.at(i)
>> > != '9')
>>
>> You might get better performance if you did something like:
>>
>> if ( testNumberOfPoints.at(i) < 48 || testNumberOfPoints.at(i) >58)
>> {
>>  // display warning
>> }
>>
>> This would require that at() returns an int or a char (i've not
>> checked). But if you can somehow do an ASCII check, it may be faster.
>>
>> Srdjan
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>> Qt-interest at trolltech.com
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>
>
>
> --
> Thanks & Regards
> S. Dasmahapatra
> B.E. (Aeronautics-Aerodynamics)
> Bangalore, India
> Ph:91-9900839788
> Office:91-80-66470248
> mail id : sujan.dasmahapatra at gmail.com
>
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