MATH(M)                                    UNIX System V



     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:

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

          M_PI_2
                              pi/2.

          M_PI_4
                              pi/4.

          M_1_PI
                              1/pi.

          M_2_PI
                              2/pi.

          M_2_SQRTPI
                              2/ square root of pi.

          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.


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


     Standards Conformance
          math is conformant with:

          The X/Open Portability Guide II of January 1987.



     (printed 8/23/89)                                  MATH(M)