# <QtCore/qmath.h> - Math Functions

The <QtCore/qmath.h> header provides various math functions. More...

## Functions

 qreal qAcos(qreal v) qreal qAsin(qreal v) qreal qAtan2(qreal y, qreal x) qreal qAtan(qreal v) int qCeil(qreal v) qreal qCos(qreal v) qreal qExp(qreal v) int qFloor(qreal v) qreal qLn(qreal v) qreal qPow(qreal x, qreal y) qreal qSin(qreal v) qreal qSqrt(qreal v) qreal qTan(qreal v)

## Function Documentation

### qrealqAcos(qreal v)

Returns the arccosine of v as an angle in radians. Arccosine is the inverse operation of cosine.

### qrealqAsin(qreal v)

Returns the arcsine of v as an angle in radians. Arcsine is the inverse operation of sine.

### qrealqAtan2(qreal y, qreal x)

Returns the arctangent of a point specified by the coordinates y and x. This function will return the angle (argument) of that point.

### qrealqAtan(qreal v)

Returns the arctangent of v as an angle in radians. Arctangent is the inverse operation of tangent.

### intqCeil(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.

### qrealqCos(qreal v)

Returns the cosine of an angle v in radians.

### qrealqExp(qreal v)

Returns the exponential function of `e` to the power of v.

### intqFloor(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.

### qrealqLn(qreal v)

Returns the natural logarithm of v. Natural logarithm uses base e.

### qrealqPow(qreal x, qreal y)

Returns the value of x raised to the power of y. That is, x is the base and y is the exponent.

### qrealqSin(qreal v)

Returns the sine of the angle v in radians.

### qrealqSqrt(qreal v)

Returns the square root of v. This function returns a NaN if v is a negative number.