Mathematical constants and functions. More...

Macros
#define	abs(a) (((a) < 0) ? -(a) : (a))
	The absolute value.

#define	max(a, b) (((a) > (b)) ? (a) : (b))
	The max of the two values.

#define	min(a, b) (((a) < (b)) ? (a) : (b))
	The min of the two values.

#define	sign(x) ((x < 0) ? -1 : ((x > 0) ? 1 : 0))
	The sign the the passed value.

#define	round_up(number, base) (((number) + (base)-1) & ~((base)-1))
	Returns a rounded up, away from zero, to the nearest multiple of b.

#define	M_E 2.7182818284590452354
	e

#define	M_LOG2E 1.4426950408889634074
	log_2 e

#define	M_LOG10E 0.43429448190325182765
	log_10 e

#define	M_LN2 0.69314718055994530942
	log_e 2

#define	M_LN10 2.30258509299404568402
	log_e 10

#define	M_PI 3.14159265358979323846
	pi

#define	M_PI_2 1.57079632679489661923
	pi / 2

#define	M_PI_4 0.78539816339744830962
	pi / 4

#define	M_1_PI 0.31830988618379067154
	1 / pi

#define	M_2_PI 0.63661977236758134308
	2 / pi

#define	M_2_SQRTPI 1.12837916709551257390
	2 / sqrt(pi)

#define	M_SQRT2 1.41421356237309504880
	sqrt(2)

#define	M_SQRT1_2 0.70710678118654752440
	1 / sqrt(2)

Functions
double	round (double x)
	Returns the integral value that is nearest to x, with halfway cases rounded away from zero. More...

double	ceil (double x)
	Rounds x upward, returning the smallest integral value that is not less than x. More...

double	floor (double x)
	Rounds x downward, returning the largest integral value that is not greater than x. More...

double	pow (double base, double exponent)
	Returns base raised to the power exponent: More...

double	exp (double x)
	Returns the base-e exponential function of x, which is e raised to the power x: e^x. More...

double	fabs (double x)
	Returns the absolute value of x: \|x\|. More...

float	fabsf (float x)
	Returns the absolute value of x: \|x\|. More...

double	sqrt (double x)
	Returns the square root of x. More...

float	sqrtf (float x)
	Returns the square root of x. More...

int	isinf (double x)
	Checks if the input value is Infinite (INF). More...

int	isnan (double x)
	Checks if the input value is Not A Number (NAN). More...

double	log10 (double x)
	Logarithm function in base 10. More...

double	ln (double x)
	Natural logarithm function. More...

double	logx (double x, double y)
	Logarithm function in base x. More...

double	modf (double x, double *intpart)
	Breaks x into an integral and a fractional part, both parts have the same sign as x. More...

Detailed Description

Mathematical constants and functions.

Copyright: (c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Function Documentation

◆ ceil()

double ceil ( double x )

Rounds x upward, returning the smallest integral value that is not less than x.

Parameters

x	Value to round up.

Returns: The smallest integral value that is not less than x (as a floating-point value).

◆ exp()

double exp ( double x )

Returns the base-e exponential function of x, which is e raised to the power x: e^x.

Parameters

x	Value of the exponent.

Returns: Exponential value of x.

If the magnitude of the result is too large to be represented by a value of the return type, the function returns HUGE_VAL (or HUGE_VALF or HUGE_VALL) with the proper sign, and an overflow range error occurs and the global variable errno is set to ERANGE.

◆ fabs()

double fabs ( double x )

Returns the absolute value of x: |x|.

Parameters

x	Value whose absolute value is returned.

Returns: The absolute value of x.

◆ fabsf()

float fabsf ( float x )

Returns the absolute value of x: |x|.

Parameters

x	Value whose absolute value is returned.

Returns: The absolute value of x.

◆ floor()

double floor ( double x )

Rounds x downward, returning the largest integral value that is not greater than x.

Parameters

x	Value to round down.

Returns: The value of x rounded downward (as a floating-point value).

◆ isinf()

int isinf ( double x )

Checks if the input value is Infinite (INF).

Parameters

x	The value to check.

Returns: 1 if INF, 0 otherwise.

◆ isnan()

int isnan ( double x )

Checks if the input value is Not A Number (NAN).

Parameters

x	The value to check.

Returns: 1 if NAN, 0 otherwise.

◆ ln()

double ln ( double x )

Natural logarithm function.

Parameters

x	Topic of the logarithm function.

Returns: Return the result.

◆ log10()

double log10 ( double x )

Logarithm function in base 10.

Parameters

x	Topic of the logarithm function.

Returns: Return the result.

◆ logx()

double logx	(	double	x,
		double	y
	)

Logarithm function in base x.

Parameters

x	Base of the logarithm.
y	Topic of the logarithm function.

Returns: Return the result.

◆ modf()

double modf	(	double	x,
		double *	intpart
	)

Breaks x into an integral and a fractional part, both parts have the same sign as x.

Parameters

x	The value we want to break.
intpart	Where we store the integer part.

Returns: the fractional part.

◆ pow()

double pow	(	double	base,
		double	exponent
	)

Returns base raised to the power exponent:

Parameters

base	Base value.
exponent	Exponent value.

Returns: The result of raising base to the power exponent.

If the base is finite negative and the exponent is finite but not an integer value, it causes a domain error. If both base and exponent are zero, it may also cause a domain error on certain implementations. If base is zero and exponent is negative, it may cause a domain error or a pole error (or none, depending on the library implementation). The function may also cause a range error if the result is too great or too small to be represented by a value of the return type.

◆ round()

double round ( double x )

Returns the integral value that is nearest to x, with halfway cases rounded away from zero.

Parameters

x	Value to round.

Returns: The value of x rounded to the nearest integral (as a floating-point value).

◆ sqrt()

double sqrt ( double x )

Returns the square root of x.

Parameters

x	Value whose square root is computed.

Returns: Square root of x. If x is negative, the global variable errno is set to EDOM.

◆ sqrtf()

float sqrtf ( float x )

Returns the square root of x.

Parameters

x	Value whose square root is computed.

Returns: Square root of x. If x is negative, the global variable errno is set to EDOM.

Macros

Functions

Detailed Description

Function Documentation

◆ ceil()

◆ exp()

◆ fabs()

◆ fabsf()

◆ floor()

◆ isinf()

◆ isnan()

◆ ln()

◆ log10()

◆ logx()

◆ modf()

◆ pow()

◆ round()

◆ sqrt()

◆ sqrtf()