Math.h

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C Standard Library headers
C++ Standard Library headers
assert.h
complex.h
ctype.h
errno.h
fenv.h
float.h
inttypes.h
iso646.h
limits.h
locale.h
math.h
setjmp.h
signal.h
stdarg.h
stdbool.h
stddef.h
stdint.h
stdio.h
stdlib.h
string.h
tgmath.h
time.h
wchar.h
wctype.h

The correct title of this article is math.h. The initial letter is shown capitalized due to technical restrictions.

math.h is a header file in the standard library of C programming language designed for basic mathematical operations. Most of the functions involve the use of floating point numbers. C++ also implements these functions for compatibility reasons and declares them in the header cmath.

All functions that take or return an angle work in radians.

[edit] Pre-C99 member functions

Name	Description
`acos`	arccosine
`asin`	arcsine
`atan`	arctangent
`atan2`	two-parameter arctangent
`ceil`	smallest integer not less than parameter
`cos`	cosine
`cosh`	hyperbolic cosine
`exp(double x)`	exponential function, computes e^x
`fabs`	absolute value
`floor`	largest integer not greater than parameter
`fmod`	floating point remainder
`frexp`	fraction and power of 2.
`ldexp`	scale exponent of floating-point value
`log`	natural logarithm
`log10`	base-10 logarithm
`modf`	obtain integral and fractional parts of floating-point number
`pow(x,y)`	compute a value taken to an exponent, x^y
`sin`	sine
`sinh`	hyperbolic sine
`sqrt`	square root
`tan`	tangent
`tanh`	hyperbolic tangent