math(M)                         19 June 1992                         math(M)


 Name

    math - math functions and constants

 Syntax

    #include <math.h>

 Description

    This file contains declarations of all the functions in the Development
    System Math Library as well as various functions in the C Library that
    return floating-point values.

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

    HUGE            The maximum value of a single-precision floating-point
                    number.

    The following mathematical constants are defined for user convenience:

    ME             The base of natural logarithms (e).

    MLOG2E         The base-2 logarithm of e.

    MLOG10E        The base-10 logarithm of e.

    MLN2           The natural logarithm of 2.

    MLN10          The natural logarithm of 10.

    MPI            pi, the ratio of the circumference of a circle to its
                    diameter.

    MPI2          pi/2

    MPI4          pi/4

    M1PI          1/pi

    M2PI          2/pi

    M2SQRTPI      2/sqrt(pi)

    MSQRT2         The positive square root of 2.

    MSQRT12       The positive square root of 1/2.

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

 See also

    intro(S), matherr(S), values(M)

 Standards conformance

    math is conformant with:

    X/Open Portability Guide, Issue 3, 1989.