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math.h(3HEAD)			    Headers			 math.h(3HEAD)

NAME
       math.h, math - mathematical declarations

SYNOPSIS
       #include <math.h>

DESCRIPTION
       The <math.h> 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 <math.h> header provides the following constants. The values are of
       type double and are accurate within the precision 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	       , the ratio of the circumference of  a  circle  to  its
		       diameter.

       M_PI_2	       /2.

       M_PI_4	       /4.

       M_1_PI	       1/.

       M_2_PI	       2/.

       M_2_SQRTPI      2 over the square root of .

       M_SQRT2	       The positive square root of 2.

       M_SQRT1_2       The positive square root of 1/2.

       The <math.h> header defines the following symbolic constants:

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

       HUGE_VAL	       A positive double expression,  not  necessarily	repre‐
		       sentable as a float. Used as an error value returned by
		       the mathematics library. HUGE_VAL evaluates to  +infin‐
		       ity on systems supporting 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 representing posi‐
		       tive or unsigned infinity, if available; else  a	 posi‐
		       tive  constant of type float that overflows at transla‐
		       tion time.

       NAN	       A constant expression  of  type	float  representing  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 repre‐
       sent 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 val‐
       ues 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,  respec‐
       tively:

       MATH_ERRNO
       MATH_ERREXCEPT

       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	 unde‐
       fined.

       The <math.h> header defines he following external variable:

       extern int signgam;

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

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

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       └─────────────────────────────┴─────────────────────────────┘

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

SunOS 5.10			  11 Aug 2004			 math.h(3HEAD)
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