Math library API

Macros
#define	NAN   __builtin_nan("")
#define	INFINITY   __builtin_inf()
#define	isnan(x)   _isnan(x)
#define	isfinite(x)   _isfinite(x)
#define	M_E   2.7182818284590452354
#define	M_PI   3.14159265358979323846
#define	M_PI_2   1.57079632679489661923
#define	M_PI_4   0.78539816339744830962
#define	FP_ILOGBNAN   (-1-(int)(((unsigned)-1)>>1))
#define	FP_ILOGB0   FP_ILOGBNAN

Functions
_const_ double	atan (double x)
	Arc tangent function. More...
_const_ float	atanf (float x)
	Arc tangent function. More...
_const_ double	atan2 (double y, double x)
	Arc tangent function of two variables. More...
_const_ float	atan2f (float y, float x)
	Arc tangent function of two variables. More...
_const_ double	ceil (double x)
	ceiling function: smallest integral value not less than argument More...
_const_ float	ceilf (float x)
	ceiling function: smallest integral value not less than argument More...
_const_ double	pow (double base, double exp)
	Calculate the exponentiation. More...
_const_ float	powf (float base, float exp)
	Calculate the exponentiation. More...
_const_ double	sqrt (double x)
	Calculate the square root of x. More...
_const_ float	sqrtf (float x)
	Calculate the square root of x. More...
_const_ double	fabs (double x)
	Calculate the absolute value of x. More...
_const_ float	fabsf (float x)
	Calculate the absolute value of x. More...
_const_ double	round (double x)
	Calculate the integral value that is the nearest to x. More...
_const_ float	roundf (float x)
	Calculate the integral value that is the nearest to x. More...
_const_ double	sin (double x)
	Calculate the sine of an angle of x radians. More...
_const_ float	sinf (float x)
	Calculate the sine of an angle of x radians. More...
_const_ double	cos (double x)
	Calculate the cosine of an angle of x radians. More...
_const_ float	cosf (float x)
	Calculate the cosine of an angle of x radians. More...
_const_ double	exp (double x)
	base-e exponential function More...
_const_ float	expf (float x)
	base-e exponential function More...
_const_ int	ilogb (double x)
	Calculate integer exponent of a floating-point value. More...
_const_ int	ilogbf (float x)
	Calculate integer exponent of a floating-point value. More...
_const_ int	ilogbl (long double x)
	Calculate integer exponent of a floating-point value. More...
_const_ double	log (double x)
	Calculate the natural logarithm. More...
_const_ float	logf (float x)
	Calculate the natural logarithm. More...
_const_ double	logb (double x)
	Calculate exponent of a floating-point value. More...
_const_ float	logbf (float x)
	Calculate exponent of a floating-point value. More...
_const_ long double	logbl (long double x)
	Calculate exponent of a floating-point value. More...
_const_ double	fmax (double x, double y)
	Determine maximum of two floating-point numbers. More...
_const_ float	fmaxf (float x, float y)
	Determine maximum of two floating-point numbers. More...
_const_ long double	fmaxl (long double x, long double y)
	Determine maximum of two floating-point numbers. More...
_const_ double	fmin (double x, double y)
	Determine minimum of two floating-point numbers. More...
_const_ float	fminf (float x, float y)
	Determine minimum of two floating-point numbers. More...
_const_ double	scalbn (double x, int exp)
	Multiply floating-point number by integral power of radix. More...
_const_ double	scalbnl (long double x, int exp)
	Multiply floating-point number by integral power of radix. More...
_const_ float	scalbnf (float x, int exp)
	Multiply floating-point number by integral power of radix. More...
_const_ double	copysign (double x, double y)
	Copy sign of a number. More...
_const_ float	copysignf (float x, float y)
	Copy sign of a number. More...
_const_ double	floor (double x)
	Get largest integral value not greater than argument. More...
_const_ float	floorf (float x)
	Get largest integral value not greater than argument. More...
_const_ double	hypot (double x, double y)
	Euclidean distance function. More...
_const_ float	hypotf (float x, float y)
	Euclidean distance function. More...
double	modf (double x, double *iptr)
	extract signed integral and fractional values from floating-point number More...
float	modff (float x, float *iptr)
	extract signed integral and fractional values from floating-point number More...

Detailed Description

Macro Definition Documentation

#define FP_ILOGB0   FP_ILOGBNAN

#include <math.h>

ilogb return value if x is zero

#define FP_ILOGBNAN   (-1-(int)(((unsigned)-1)>>1))

#include <math.h>

ilogb return value if x is NAN

#define INFINITY   __builtin_inf()

#include <math.h>

Infinity number

#define isfinite

(

x

)

_isfinite(x)

#include <math.h>

Parameters

[in]

x

- value to check for finite

Returns

!0 - is number, 0 - NaN or infinite

#define isnan

(

x

)

_isnan(x)

#include <math.h>

Parameters

[in]

x

- value to check for NaN

Returns

0 - is number, !0 - NaN

#define M_E   2.7182818284590452354

#include <math.h>

e - base of the natural logarithm

#define M_PI   3.14159265358979323846

#include <math.h>

pi - the ratio of a circle's circumference to its diameter

#define M_PI_2   1.57079632679489661923

#include <math.h>

pi/2

#define M_PI_4   0.78539816339744830962

#include <math.h>

pi/4

#define NAN   __builtin_nan("")

#include <math.h>

Not A Number

Function Documentation

_const_ double atan

(

double

x

)

#include <math.h>

Arc tangent function.

Parameters

[in]

x

function argument

Returns

arc tangent of function argument

_const_ double atan2	(	double	y,
		double	x
	)

#include <math.h>

Arc tangent function of two variables.

Parameters

[in]	y	function argument
[in]	x	function argument

Returns

principal value of the arc tangent of y/x in radians

_const_ float atan2f	(	float	y,
		float	x
	)

#include <math.h>

Arc tangent function of two variables.

Parameters

[in]	y	function argument
[in]	x	function argument

Returns

principal value of the arc tangent of y/x in radians

_const_ float atanf

(

float

x

)

#include <math.h>

Arc tangent function.

Parameters

[in]

x

function argument

Returns

arc tangent of function argument

_const_ double ceil

(

double

x

)

#include <math.h>

ceiling function: smallest integral value not less than argument

Parameters

[in]

x

function argument

Returns

ceiling of x

_const_ float ceilf

(

float

x

)

#include <math.h>

ceiling function: smallest integral value not less than argument

Parameters

[in]

x

function argument

Returns

ceiling of x

_const_ double copysign	(	double	x,
		double	y
	)

#include <math.h>

Copy sign of a number.

Parameters

[in]	x	function argument
[in]	y	sign source

Returns

value whose absolute value matches that of x, but whose sign bit matches that of y

_const_ float copysignf	(	float	x,
		float	y
	)

#include <math.h>

Copy sign of a number.

Parameters

[in]	x	function argument
[in]	y	sign source

Returns

value whose absolute value matches that of x, but whose sign bit matches that of y

_const_ double cos

(

double

x

)

#include <math.h>

Calculate the cosine of an angle of x radians.

Parameters

[in]

x

function argument in radians

Returns

the result of calculation

_const_ float cosf

(

float

x

)

#include <math.h>

Calculate the cosine of an angle of x radians.

Parameters

[in]

x

function argument in radians

Returns

the result of calculation

_const_ double exp

(

double

x

)

#include <math.h>

base-e exponential function

Parameters

[in]

x

function argument in radians

Returns

value of e raised to the power of x

_const_ float expf

(

float

x

)

#include <math.h>

base-e exponential function

Parameters

[in]

x

function argument in radians

Returns

value of e raised to the power of x

_const_ double fabs

(

double

x

)

#include <math.h>

Calculate the absolute value of x.

Parameters

[in]

x

function argument

Returns

the result of calculation

_const_ float fabsf

(

float

x

)

#include <math.h>

Calculate the absolute value of x.

Parameters

[in]

x

function argument

Returns

the result of calculation

_const_ double floor

(

double

x

)

#include <math.h>

Get largest integral value not greater than argument.

Parameters

[in]

x

function argument

Returns

the floor of x

_const_ float floorf

(

float

x

)

#include <math.h>

Get largest integral value not greater than argument.

Parameters

[in]

x

function argument

Returns

the floor of x

_const_ double fmax	(	double	x,
		double	y
	)

#include <math.h>

Determine maximum of two floating-point numbers.

Parameters

[in]	x	function argument
[in]	y	function argument

Returns

maximal value of x or y

_const_ float fmaxf	(	float	x,
		float	y
	)

#include <math.h>

Determine maximum of two floating-point numbers.

Parameters

[in]	x	function argument
[in]	y	function argument

Returns

maximal value of x or y

_const_ long double fmaxl	(	long double	x,
		long double	y
	)

#include <math.h>

Determine maximum of two floating-point numbers.

Parameters

[in]	x	function argument
[in]	y	function argument

Returns

maximal value of x or y

_const_ double fmin	(	double	x,
		double	y
	)

#include <math.h>

Determine minimum of two floating-point numbers.

Parameters

[in]	x	function argument
[in]	y	function argument

Returns

minimal value of x or y

_const_ float fminf	(	float	x,
		float	y
	)

#include <math.h>

Determine minimum of two floating-point numbers.

Parameters

[in]	x	function argument
[in]	y	function argument

Returns

minimal value of x or y

_const_ double hypot	(	double	x,
		double	y
	)

#include <math.h>

Euclidean distance function.

Parameters

[in]	x	function argument
[in]	y	function argument

Returns

length of a right-angled triangle with sides of length x and y

_const_ float hypotf	(	float	x,
		float	y
	)

#include <math.h>

Euclidean distance function.

Parameters

[in]	x	function argument
[in]	y	function argument

Returns

length of a right-angled triangle with sides of length x and y

_const_ int ilogb

(

double

x

)

#include <math.h>

Calculate integer exponent of a floating-point value.

Parameters

[in]

x

function argument

Returns

exponent of x, as a signed integer

_const_ int ilogbf

(

float

x

)

#include <math.h>

Calculate integer exponent of a floating-point value.

Parameters

[in]

x

function argument

Returns

exponent of x, as a signed integer

_const_ int ilogbl

(

long double

x

)

#include <math.h>

Calculate integer exponent of a floating-point value.

Parameters

[in]

x

function argument

Returns

exponent of x, as a signed integer

_const_ double log

(

double

x

)

#include <math.h>

Calculate the natural logarithm.

Parameters

[in]

x

function argument

Returns

the result of calculation

_const_ double logb

(

double

x

)

#include <math.h>

Calculate exponent of a floating-point value.

Parameters

[in]

x

function argument

Returns

the result of calculation

_const_ float logbf

(

float

x

)

#include <math.h>

Calculate exponent of a floating-point value.

Parameters

[in]

x

function argument

Returns

the result of calculation

_const_ long double logbl

(

long double

x

)

#include <math.h>

Calculate exponent of a floating-point value.

Parameters

[in]

x

function argument

Returns

the result of calculation

_const_ float logf

(

float

x

)

#include <math.h>

Calculate the natural logarithm.

Parameters

[in]

x

function argument

Returns

the result of calculation

double modf	(	double	x,
		double *	iptr
	)

#include <math.h>

extract signed integral and fractional values from floating-point number

Parameters

[in]	x	function argument
[in,out]	iptr	integral part is stored in the location pointed to by iptr

Returns

return the fractional part of x

float modff	(	float	x,
		float *	iptr
	)

#include <math.h>

extract signed integral and fractional values from floating-point number

Parameters

[in]	x	function argument
[in,out]	iptr	integral part is stored in the location pointed to by iptr

Returns

return the fractional part of x

_const_ double pow	(	double	base,
		double	exp
	)

#include <math.h>

Calculate the exponentiation.

Parameters

[in]	base	base value
[in]	exp	exponent value

Returns

base raised to the power exponent

_const_ float powf	(	float	base,
		float	exp
	)

#include <math.h>

Calculate the exponentiation.

Parameters

[in]	base	base value
[in]	exp	exponent value

Returns

base raised to the power exponent

_const_ double round

(

double

x

)

#include <math.h>

Calculate the integral value that is the nearest to x.

Parameters

[in]

x

function argument

Returns

the result of calculation

_const_ float roundf

(

float

x

)

#include <math.h>

Calculate the integral value that is the nearest to x.

Parameters

[in]

x

function argument

Returns

the result of calculation

_const_ double scalbn	(	double	x,
		int	exp
	)

#include <math.h>

Multiply floating-point number by integral power of radix.

Parameters

[in]	x	function argument
[in]	exp	exponent

Returns

result of calculation

_const_ float scalbnf	(	float	x,
		int	exp
	)

#include <math.h>

Multiply floating-point number by integral power of radix.

Parameters

[in]	x	function argument
[in]	exp	exponent

Returns

result of calculation

_const_ double scalbnl	(	long double	x,
		int	exp
	)

#include <math.h>

Multiply floating-point number by integral power of radix.

Parameters

[in]	x	function argument
[in]	exp	exponent

Returns

result of calculation

_const_ double sin

(

double

x

)

#include <math.h>

Calculate the sine of an angle of x radians.

Parameters

[in]

x

function argument in radians

Returns

the result of calculation

_const_ float sinf

(

float

x

)

#include <math.h>

Calculate the sine of an angle of x radians.

Parameters

[in]

x

function argument in radians

Returns

the result of calculation

_const_ double sqrt

(

double

x

)

#include <math.h>

Calculate the square root of x.

Parameters

[in]

x

function argument

Returns

the result of calculation

_const_ float sqrtf

(

float

x

)

#include <math.h>

Calculate the square root of x.

Parameters

[in]

x

function argument

Returns

the result of calculation