NAME

math − math functions and constants

SYNOPSIS

#include <math.h>

DESCRIPTION

This file contains declarations of all the functions in the Math Library (described in Section (3M)), as well as various functions in the C Library (Section (3C)) that return floating-point values. 

It defines the structure and constants used by the matherr(3M) error-handling mechanisms, including the following constant used as an error-return value:

HUGE_VAL The maximum non-infinity value of a double-precision floating-point number. 

The following mathematical constants are defined for user convenience:

M_E The base of natural logarithms (e).

M_LOG2E The base-2 logarithm of e.

M_LOG10E The base-10 logarithm of e.

M_LN2 The natural logarithm of 2. 

M_LN10 The natural logarithm of 10. 

M_PI The ratio of the circumference of a circle to its diameter.  (There are also several fractions of its reciprocal and its square root.) 

M_SQRT2 The positive square root of 2. 

M_SQRT1_2 The positive square root of 1/2. 

For the definitions of various machine-dependent “constants”, see the description of the <values.h> header file. 

FILES

/usr/include/math.h

SEE ALSO

intro(3), matherr(3M), values(5). 

STANDARDS CONFORMANCE

<math.h>: AES, SVID3, XPG2, XPG3, XPG4

Hewlett-Packard Company  —  HP-UX Release 10.20:  July 1996