四舍五入 qFloor qCeil qRound

四舍五入 qFloor qCeil qRound

qFloor 向下取整 无条件舍去

qCeil 向上取整 无条件进位

qRound 四舍五入

也可以使用 QString::number() 函数 或 QString::arg() 函数

int qFloor(qreal v)

Return the floor of the value v.

The floor is the largest integer that is not greater than v. For example, if v is 41.2, then the floor is 41.

See also qCeil().

int qCeil(qreal v)

Return the ceiling of the value v.

The ceiling is the smallest integer that is not less than v. For example, if v is 41.2, then the ceiling is 42.

See also qFloor().

qint64 qRound64(qfloat16 value)

Rounds value to the nearest 64-bit integer.

See also qRound64.

int qRound(qfloat16 value)

Rounds value to the nearest integer.

See also qRound.

Macro Documentation

QT_NO_FLOAT16_OPERATORS

Defining this macro disables the arithmetic operators for qfloat16.

This is only necessary on Visual Studio 2017 (and earlier) when including <QFloat16> and <bitset> in the same translation unit, which would otherwise cause a compilation error due to a toolchain bug (see [QTBUG-72073]).

This function was introduced in Qt 5.12.4. 

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