| math.h | Header File

Header File Index

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.