floatingpoint.h(3HEAD)						      Headers						    floatingpoint.h(3HEAD)

NAME

       floatingpoint.h, floatingpoint - IEEE floating point definitions

SYNOPSIS

       #include <floatingpoint.h>

DESCRIPTION

       This  file defines constants, types, and functions used to implement standard floating point according to ANSI/IEEE Std 754-1985. The func-
       tions are implemented in libc. The included header file <sys/ieeefp.h> defines certain types of interest to the kernel.

   IEEE Rounding Modes
       fp_direction_type	       The type of the IEEE rounding direction mode. Note: the order of enumeration varies according to hardware.

       fp_precision_type	       The type of the IEEE rounding precision mode, which only applies on systems that support extended precision
				       such as machines based on the Intel 80387 FPU or the 80486. SIGFPE handling:

       sigfpe_code_type 	       The type of a SIGFPE code.

       sigfpe_handler_type	       The type of a user-definable SIGFPE exception handler called to handle a particular SIGFPE code.

       SIGFPE_DEFAULT		       A  macro  indicating the default SIGFPE exception handling, namely to perform the exception handling speci-
				       fied by the user, if any, and otherwise to dump core using abort(3C).

       SIGFPE_IGNORE		       A macro indicating an alternate SIGFPE exception handling, namely to ignore and continue execution.

       SIGFPE_ABORT		       A macro indicating an alternate SIGFPE exception handling, namely to abort with a core dump.

   IEEE Exception Handling
       N_IEEE_EXCEPTION 	       The number of distinct IEEE floating-point exceptions.

       fp_exception_type	       The type of the N_IEEE_EXCEPTION exceptions.  Each exception is given a bit number.

       fp_exception_field_type	       The type intended to hold at least N_IEEE_EXCEPTION bits corresponding to the IEEE exceptions  numbered	by
				       fp_exception_type.  Thus  fp_inexact  corresponds  to the least significant bit and fp_invalid to the fifth
				       least significant bit. Note: some operations may set more than one exception.

   IEEE Formats and Classification
       single;extended;quadruple       Definitions of IEEE formats.

       fp_class_type		       An enumeration of the various classes of IEEE values and symbols.

   IEEE Base Conversion
       The functions described under floating_to_decimal(3C) and decimal_to_floating(3C) satisfy not only the IEEE Standard, but also the stricter
       requirements of correct rounding for all arguments.

       DECIMAL_STRING_LENGTH	       The length of a decimal_string.

       decimal_string		       The digit buffer in a decimal_record.

       decimal_record		       The canonical form for representing an unpacked decimal floating-point number.

       decimal_form		       The type used to specify fixed or floating binary to decimal conversion.

       decimal_mode		       A struct that contains specifications for conversion between binary and decimal.

       decimal_string_form	       An  enumeration	of  possible  valid  character strings representing floating-point numbers, infinities, or
				       NaNs.

FILES

       /usr/include/sys/ieeefp.h

SEE ALSO

       abort(3C), decimal_to_floating(3C), econvert(3C), floating_to_decimal(3C), sigfpe(3C), string_to_decimal(3C), strtod(3C)

SunOS 5.10							    5 Mar 1993						    floatingpoint.h(3HEAD)