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ieee_sun (3)
  • >> ieee_sun (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         ieee_sun, fp_class, isinf,  isnormal,  issubnormal,  iszero,
         signbit,     nonstandard_arithmetic,    standard_arithmetic,
         ieee_retrospective - miscellaneous functions for IEEE arith-
         metic
    
    SYNOPSIS
         cc [ flag ... ] file ...  -lsunmath -lm [ library ... ]
    
         #include <sunmath.h>
    
         enum fp_class_type fp_class(double x);
    
         int isinf(double x);
    
         int isnormal(double x);
    
         int issubnormal(double x);
    
         int iszero(double x);
    
         int signbit(double x);
    
         void nonstandard_arithmetic(void);
    
         void standard_arithmetic(void);
    
         #include <stdio.h>
    
         void ieee_retrospective(FILE *f);
    
    DESCRIPTION
         Please    see    copysign(3M),     ilogb(3M),     isnan(3M),
         nextafter(3M), remainder(3M), and scalbn(3M), for a descrip-
         tion  of  a  few  more  commonly  used  (and   standardized)
         ANSI/IEEE Std 754-1985 related functions.
    
         Most of the functions provide capabilities suggested in  the
         Appendix of ANSI/IEEE Std 754-1985.
    
         fp_class(x) corresponds to the IEEE's class() and classifies
         x as zero, subnormal, normal, oo, or quiet or signaling NaN;
         <floatingpoint.h> defines enum fp_class_type.
    
         The following functions return 0 if the indicated  condition
         is not satisfied:
              isinf(x)       returns 1 if x is oo
              isnormal(x)    returns 1 if x is normal
              issubnormal(x) returns 1 if x is subnormal
              iszero(x)      returns 1 if x is zero
              signbit(x)     returns 1 if x's sign bit is set
    
         nonstandard_arithmetic() and standard_arithmetic() are mean-
         ingful on systems that provide an alternative faster mode of
         floating-point arithmetic  that  does  not  conform  to  the
         default  IEEE  Standard. Nonstandard modes vary among imple-
         mentations; nonstandard mode may, for  instance,  result  in
         setting  subnormal  results to zero or in treating subnormal
         operands   as   zero,   or   both,   or   something    else.
         standard_arithmetic()  reverts to the default standard mode.
         On systems that provide only one mode, these functions  have
         no effect.
    
         ieee_retrospective(f) prints a message to the FILE *f  list-
         ing  all  non-default  floating-point  modes  and  status in
         effect  when  called,  including  IEEE  accrued   exception-
         occurred  status bits, IEEE rounding direction and precision
         modes, IEEE trap-enable modes,  and  nonstandard  arithmetic
         mode.   ieee_retrospective(f)  is intended to be used at the
         end of a program to indicate exceptional floating-point con-
         ditions that might have affected the result.
    
    SEE ALSO
         copysign(3M), ieee_flags(3M),  ieee_handler(3M),  ilogb(3M),
         isnan(3M),    nextafter(3M),    remainder(3M),   scalbn(3M),
         floatingpoint(5).
    
    
    
    


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