Conversion from string to double and precision

[Klenje]

Hi, I need to read a string from an xml file and then convert it to double. My problem is that I can't find a way to specify precision, so I lose some decimals. Example:

QLocale c(QLocale::C);
qDebug() << c.toDouble("44.48666300");

QLocale c(QLocale::C);
qDebug() << c.toDouble("44.48666300");

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this prints 44.4867. I need to set the locale since the file uses always the dot as a decimal separator.
It seems that I can specify precision only if I convert a double into a string, not the opposite; do you have any advice? I guess I'll have to use directly some C++ standard function
Thanks in advance