# <QtMath> - Generic Math Functions¶

File provides various math functions

The <QtMath> header file provides various math functions.

These functions are partly convenience definitions for basic math operations not available in the C or Standard Template Libraries.

The header also ensures some constants specified in POSIX, but not present in C++ standards (so absent from <math.h> on some platforms), are defined:

M_E

The base of the natural logarithms, e = exp(1)

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()`

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()`

Returns the absolute value of

`v`

as a qreal.Returns the sine of the angle

`v`

in radians.See also

`qCos()`

`qTan()`

Returns the cosine of an angle

`v`

in radians.See also

`qSin()`

`qTan()`

Returns the tangent of an angle

`v`

in radians.See also

`qSin()`

`qCos()`

Returns the arccosine of

`v`

as an angle in radians. Arccosine is the inverse operation of cosine.See also

`qAtan()`

`qAsin()`

`qCos()`

Returns the arcsine of

`v`

as an angle in radians. Arcsine is the inverse operation of sine.See also

`qSin()`

`qAtan()`

`qAcos()`

Returns the arctangent of

`v`

as an angle in radians. Arctangent is the inverse operation of tangent.See also

`qTan()`

`qAcos()`

`qAsin()`

Returns the arctangent of a point specified by the coordinates

`y`

and`x`

. This function will return the angle (argument) of that point.See also

`qAtan()`

Returns the square root of

`v`

. This function returns a NaN if`v`

is a negative number.See also

`qPow()`

Returns the natural logarithm of

`v`

. Natural logarithm uses base e.See also

`qExp()`

Returns the exponential function of

`e`

to the power of`v`

.See also

`qLn()`

Returns the value of

`x`

raised to the power of`y`

. That is,`x`

is the base and`y`

is the exponent.See also

`qSqrt()`

This function converts the

`degrees`

in float to radians.Example:

float degrees = 180.0f float radians = qDegreesToRadians(degrees)See also

`qRadiansToDegrees()`

This function converts the

`degrees`

in double to radians.Example:

double degrees = 180.0 double radians = qDegreesToRadians(degrees)See also

`qRadiansToDegrees()`

This function converts the

`radians`

in float to degrees.Example:

float radians = float(M_PI) float degrees = qRadiansToDegrees(radians)See also

`qDegreesToRadians()`

This function converts the

`radians`

in double to degrees.Example:

double radians = M_PI double degrees = qRadiansToDegrees(radians)See also

`qDegreesToRadians()`

This function returns the nearest power of two greater than

`value`

. For 0 it returns 1, and for values larger than or equal to 2^31 it returns 0.This is an overloaded function.

This function returns the nearest power of two greater than

`value`

. For negative values it returns 0.This function returns the nearest power of two greater than

`value`

. For 0 it returns 1, and for values larger than or equal to 2^63 it returns 0.This is an overloaded function.

This function returns the nearest power of two greater than

`value`

. For negative values it returns 0.

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