Qt 取整函數 Ceil Floor Round

qCeil 向上取整

qFloor 向下取整

qRound 四舍五入

 

    double a = 11.2; 2     double b = 11.5; 3     double c = -11.2; 4     double d = -11.5; 5  
    qDebug() << " " << ceil(a)  << " " << ceil(b)  << " " << ceil(c)  << " " << ceil(d); 7     qDebug() << " " << floor(a) << " " << floor(b) << " " << floor(c) << " " << floor(d);

輸出為： 12  12  -11  -11

  11  11  -12  -12