


      MATH(5)                     (UNIX 5.2)                    MATH(5)



      NAME
           math - math functions and constants

      SYNTAX
           #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                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                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).





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