QString？ QString::number(double？ n，？ Charles? Format? =? g '，？ int？ Accuracy? =? 6)

Return? Answer? String? Equivalence? Yes? That? Number? n，？ Format? According to? Where to? That? Designated? Format? And then what? Precision. ? Do you see it? Arguing? Format? For what? Details.

Don't like? QLocale::toString()，？ This? Function? Is it? Isn't it? Honor? That? User's? The scene? Setting methods of member functions setnum and arg. QString can also set the precision, and the precision parameter is the precision after the decimal point.