"1 + QDecDouble" causes an odd result without warnings

[GoogleCodeExporter]

> What steps will reproduce the problem?

I compiled
      QDecDouble num("0.1");
      QDecDouble aux = 1 + num;
      cout << aux << endl;
and the result was
        8.19999E-393
which is very close to zero, which is not adequate. 

However, I compiled 
        double num(0.1);
        double aux = 1 + num;
        cout << aux << endl;
and the result was 
        1.1
which is correct. I obtained the same result using "qreal" instead of "double", 
of course.

> What version of the product are you using? On what operating system?
QDecimal 1.0.1. Kubuntu 13.04.

Thanks for QDecimal! 

Original issue reported on code.google.com by b3811...@uggsrock.com on 10 Aug 2013 at 5:48

[GoogleCodeExporter]

I also executed, with Gcc 4.7.3:

    #include <decimal/decimal>
    // [...]        

    typedef std::decimal::decimal64 dec64; 

    dec64 num(0.1dd);
    dec64 aux = 1 + num;

    dec64 onePointOne(1.1dd);
    if (aux == onePointOne)
        std::cout << "1.1" << std::endl;
    else
        std::cout << "ERROR." << std::endl;

and the result was 
    1.1
which is correct. 

Original comment by b3811...@uggsrock.com on 11 Aug 2013 at 4:49

[GoogleCodeExporter]

If it can be useful to anyone, I created a simple example that I attach. When 
GCC 4.7.3 tries to compile it, instead of generating an unintended code, GCC 
talks about an error ("no match for call to 'operator+’") and it does not 
continue compiling.

Original comment by b3811...@uggsrock.com on 12 Aug 2013 at 10:44

Attachments:

• simple_wrapper.cpp

[GoogleCodeExporter]

If it can be useful to anyone, I created another simple example, that I attach. 
GCC 4.7.3 compiles it, and the intended result is seen:
    1.1
    1.1

Original comment by b3811...@uggsrock.com on 13 Aug 2013 at 12:16

Attachments:

• simple_wrapper.cpp