ANSI-compatible routines for floating point arithmetic

Functions

abs

Absolute value of a number.

acos

Floating point arc cosine.

acosh

Floating point hyperbolic area cosine.

asin

Floating point arc sine.

asinh

Floating point hyperbolic area sine.

atan2

Four-quadrant arc tangent of y/x (or argument of the complex number).

atan

Floating point arc tangent.

atanh

Floating point hyperbolic area tangent.

atof

Converts a string to a floating point.

cacos

Complex arc cosine.

cacosh

Complex hyperbolic area cosine.

casin

Complex arc sine.

casinh

Complex hyperbolic area sine.

catan

Complex arc tangent.

catanh

Complex hyperbolic area tangent.

ccos

Complex cosine.

ccosh

Complex hyperbolic cosine.

ceil

Rounds up the floating point number.

cexp

Complex exponential function.

cln

Complex natural logarithm (base e).

clog10

Complex logarithm, base 10.

cos

Floating point cosine.

cosh

Floating point hyperbolic cosine.

csin

Complex sine.

csinh

Complex hyperbolic sine.

csqrt

Complex square root.

ctan

Complex tangent.

ctanh

Complex hyperbolic tangent.

exp

Floating point exponential function.

fabs

Absolute value of a floating point number.

floor

Rounds down the floating point number.

fmod

Calculates x modulo y, i.e. the remainder of x/y.

frexp10

Splits floating point number into mantissa and exponent.

hypot

Calculates hypotenuse of right triangle.

is_inf

Checks whether the argument is an infinite number.

is_nan

Checks whether the argument is Not_a_Number.

is_nzero

Checks whether the argument is negative zero.

is_pzero

Checks whether the argument is positive zero.

is_sinf

Checks whether the argument is signed infinity.

is_transfinite

Checks whether the argument is a transfinite number.

is_uinf_or_nan

Checks whether the argument is unsigned infinity or Not_a_Number.

is_uzero

Checks whether the argument is unsigned zero.

labs

Absolute value of a long integer number.

ldexp10

Calculates x times 10 raised to exponent.

log

Floating point natural logarithm (base e).

log10

Floating point logarithm, base 10.

modf

Splits floating point value into integer and fraction part.

pow

Floating point power function.

sin

Floating point sine.

sinh

Floating point hyperbolic sine.

sqrt

Floating point square root.

tan

Floating point tangent.

tanh

Floating point hyperbolic tangent.

Constants

HALF_PI

A constant with value PI/2.

NAN

A constant defining an undefined value.

NEGATIVE_INF

Represents an infinitely large negative quantity.

NEGATIVE_ZERO

Represents an infinitely small quantity which is known to be always non-positive.

PI

An approximated value of pi.

POSITIVE_INF

Represents an infinitely large positive quantity.

POSITIVE_ZERO

Represents an infinitely small quantity which is known to be always non-negative.

UNSIGNED_INF

Represents an infinite quantity.

UNSIGNED_ZERO

Represents an infinitely small quantity with indeterminate sign.

ZERO

A deprecated constant.

Predefined Types

bcd

Represents the internal organization of floating point numbers in the format recognized by the TIOS.

Bool

An enumeration to describe true or false values.

Note: All functions which return a result of type float are implemented as macros, although many of them exist as TIOS entries. This is done because the GCC convention for returning floating point values as function results differs from the convention expected by the TIOS. This note is mainly unimportant from the user's point of view. Also note that the timath.h header file contains all functions from math.h, but in addition to this, it also contains some TIOS-specific low-level floating point functions.

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