converting QString to FLOAT behaves unexpectedly

[timmu]

Hi,

When I do this:

QString forty= "40.1";
float frty = forty.toFloat();
printf("%f\n", frty);

QString forty= "40.1";
float frty = forty.toFloat();
printf("%f\n", frty);

To copy to clipboard, switch view to plain text mode 

I get:
40.099998

Why don't I get 40.1? I'm very thankful for any ideas.
Thanks!

[Oleg]

There's nothing wrong with QString::toFloat(), it's result of casting your value to double inside printf. Some more info here.
Try this

qDebug() << frty;

qDebug() << frty;

To copy to clipboard, switch view to plain text mode