MATH(5)                  DOMAIN/IX SYS5                   MATH(5)



NAME
     math - math functions and constants

USAGE
     #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 con-
     stants used by the 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:

     M_E            The base of natural logarithms (e).

     M_LOG2E        The base-2 logarithm of BIR 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 frac-
                    tions 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

RELATED INFORMATION
     intro(3), values(5)








Printed 12/4/86                                            MATH-1