<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.

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.

qCeil()

Returns the absolute value of v as a qreal.

Returns the sine of the angle v in radians.

qCos() qTan()

Returns the cosine of an angle v in radians.

qSin() qTan()

Returns the tangent of an angle v in radians.

qSin() qCos()

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

qAtan() qAsin() qCos()

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

qSin() qAtan() qAcos()

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

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.

qAtan()

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

qPow()

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

qExp()

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

qLn()

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

qSqrt()

This function converts the degrees in float to radians.

Example:

float degrees = 180.0f

This function converts the degrees in double to radians.

Example:

double degrees = 180.0

This function converts the radians in float to degrees.

Example:

This function converts the radians in double to degrees.

Example: