Manual Pages for UNIX Operating System command usage for man math

Headers                                             math.h(3HEAD)



NAME
     math.h, math - mathematical declarations

SYNOPSIS
     #include 


DESCRIPTION
     The  header includes definitions for  the  following
     types:

     float_t     A real-floating type at least as wide as float.


     double_t    A real-floating type at least as wide as double,
                 and at least as wide as float_t.



     If FLT_EVAL_METHOD equals 0, float_t and double_t are  float
     and  double, respectively. If FLT_EVAL_METHOD equals 1, they
     are both double. If FLT_EVAL_METHOD equals 2, they are  both
     be   long   double.  Other  values  of  FLT_EVAL_METHOD  are
     implementation-defined.


     The  header provides the  following  constants.  The
     values are of type double and are accurate within the preci-
     sion of the double type.

     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.





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Headers                                             math.h(3HEAD)



     M_PI_4        pi/4.


     M_1_PI        1/pi


     M_2_PI        2/pi


     M_2_SQRTPI    2 over the square root of pi


     M_SQRT2       The positive square root of 2.


     M_SQRT1_2     The positive square root of 1/2.



     The  header  defines  the  following  symbolic  con-
     stants:

     MAXFLOAT     The maximum value  of  a  non-infinite  single-
                  precision floating point number.


     HUGE_VAL     A positive double expression,  not  necessarily
                  representable  as  a  float.  Used  as an error
                  value  returned  by  the  mathematics  library.
                  HUGE_VAL evaluates to +infinity on systems sup-
                  porting IEEE Std 754-1985.


     HUGE_VALF    A positive float constant expression.  Used  as
                  an  error  value  returned  by  the mathematics
                  library. HUGE_VALF evaluates  to  +infinity  on
                  systems supporting IEEE Std 754-1985.


     HUGE_VALL    A positive  long  double  constant  expression.
                  Used   as   an  error  value  returned  by  the
                  mathematics  library.  HUGE_VALL  evaluates  to
                  +infinity  on  systems supporting IEEE Std 754-
                  1985.


     INFINITY     A constant expression of type float  represent-
                  ing  positive  or  unsigned infinity, if avail-
                  able; else a positive constant  of  type  float
                  that overflows at translation time.





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Headers                                             math.h(3HEAD)



     NAN          A constant expression of type float  represent-
                  ing a quiet NaN. This symbolic constant is only
                  defined if the  implementation  supports  quiet
                  NaNs for the float type.



     The following macros are defined for number  classification.
     They  represent  the  mutually-exclusive  kinds of floating-
     point values. They expand to  integer  constant  expressions
     with distinct values

       FP_INFINITE
       FP_NAN
       FP_NORMAL
       FP_SUBNORMAL
       FP_ZERO



     The following optional macros  indicate  whether  the  fma()
     family of functions are fast compared with direct code:

       FP_FAST_FMA
       FP_FAST_FMAF
       FP_FAST_FMAL



     The FP_FAST_FMA macro is defined to indicate that the  fma()
     function  generally  executes  about  as  fast as, or faster
     than, a multiply and an add of double  operands.  The  other
     macros  have  the  equivalent meaning for the float and long
     double versions.


     The following macros expand to integer constant  expressions
     whose  values  are returned by ilogb(x) if x is zero or NaN,
     respectively. The value of FP_ILOGB0 is either {INT_MIN}  or
     -{INT_MAX}.  The value of FP_ILOGBNAN is either {INT_MAX} or
     {INT_MIN}.

       FP_ILOGB0
       FP_ILOGBNAN



     The following macros expand to the integer constants  1  and
     2, respectively:

       MATH_ERRNO
       MATH_ERREXCEPT



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Headers                                             math.h(3HEAD)



     The following macro expands to an expression that  has  type
     int and the value MATH_ERREXCEPT:

       math_errhandling



     The value of the macro math_errhandling is constant for  the
     duration of the program. If a macro definition is suppressed
     or  a  program  defines  an   identifier   with   the   name
     math_errhandling, the behavior is undefined.


     The  header defines he following external variable:

       extern int signgam;



     The  header defines the structure and constants used
     by the matherr(3M) error-handling mechanisms.

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | Standard                    | See standards(5).           |
    |_____________________________|_____________________________|


SEE ALSO
     Intro(3),   fenv.h(3HEAD),   libm(3LIB),    limits.h(3HEAD),
     matherr(3M), attributes(5), standards(5)















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