fp_class(3) — mips UMIPS RISC/os 5.01



FPCLASS(3)         RISC/os Reference Manual          FPCLASS(3)



NAME
     fp_class - classes of IEEE floating-point values

SYNOPSIS
     #include <fpclass.h>

     int fpclassd(double x);

     int fpclassf(float x);

DESCRIPTION
     These routines are used to determine the class of IEEE
     floating-point values.  They return one of the constants in
     the file <fp_class.h> and never cause an exception even for
     signaling NaN's.  These routines are to implement the recom-
     mended function class(x) in the appendix of the IEEE
     754-1985 standard for binary floating-point arithmetic.

     The constants in <fp_class.h> refer to the following classes
     of values:

     Constant       Class
     FP_SNAN        Signaling NaN (Not-a-Number)
     FP_QNAN        Quiet NaN (Not-a-Number)
     FP_POS_INF     +oo (positive infinity)
     FP_NEG_INF     -oo (negative infinity)
     FP_POS_NORM    positive normalized non-zero
     FP_NEG_NORM    negative normalized non-zero
     FP_POS_DENORM  positive denormalized
     FP_NEG_DENORM  negative denormalized
     FP_POS_ZERO    +0.0 (positive zero)
     FP_NEG_ZERO    -0.0 (negative zero)

ALSO SEE
     ANSI/IEEE Std 754-1985, IEEE Standard for Binary Floating-
     Point Arithmetic



















                        Printed 11/19/92                   Page 1
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