math(5)                                                   math(5)



     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 follow-
          ing constant used as an error-return value.

          HUGE                The maximum 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 cir-
                              cle 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 ``con-
          stants,'' see the description of the <values.h> header file.

     FILES
          /usr/include/math.h

     SEE ALSO
          intro(3), matherr(3M), values(5).






     April, 1990                                                     1