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fpclassify(3) [netbsd man page]

FPCLASSIFY(3)						   BSD Library Functions Manual 					     FPCLASSIFY(3)

fpclassify -- classify real floating type LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <math.h> int fpclassify(real-floating x); DESCRIPTION
The fpclassify() macro performs classification of its argument x. An argument represented in a format wider than its semantic type is con- verted to its semantic type first. The classification is then based on the type of the argument. IEEE 754 FP_INFINITE infinity, either positive or negative FP_NAN not-a-number (``NaN'') FP_NORMAL normal FP_SUBNORMAL subnormal FP_ZERO zero VAX FP_ROP reserved operand (``ROP'') FP_DIRTYZERO dirty zero FP_NORMAL finite FP_ZERO true zero RETURN VALUES
The fpclassify() macro returns the value of the number classification macro appropriate to its argument x as described above. ERRORS
No errors are defined. SEE ALSO
isfinite(3), isnormal(3), math(3), signbit(3) STANDARDS
The fpclassify() macro conforms to ISO/IEC 9899:1999 (``ISO C99''). BSD
January 14, 2004 BSD

Check Out this Related Man Page

FPCLASSIFY(3)						   BSD Library Functions Manual 					     FPCLASSIFY(3)

fpclassify, isfinite, isinf, isnan, isnormal -- classify a floating-point number LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> int fpclassify(real-floating x); int isfinite(real-floating x); int isinf(real-floating x); int isnan(real-floating x); int isnormal(real-floating x); DESCRIPTION
The fpclassify() macro takes an argument of x and returns one of the following manifest constants. FP_INFINITE Indicates that x is an infinite number. FP_NAN Indicates that x is not a number (NaN). FP_NORMAL Indicates that x is a normalized number. FP_SUBNORMAL Indicates that x is a denormalized number. FP_ZERO Indicates that x is zero (0 or -0). The isfinite() macro returns a non-zero value if and only if its argument has a finite (zero, subnormal, or normal) value. The isinf(), isnan(), and isnormal() macros return non-zero if and only if x is an infinity, NaN, or a non-zero normalized number, respectively. SEE ALSO
isgreater(3), math(3), signbit(3) STANDARDS
The fpclassify(), isfinite(), isinf(), isnan(), and isnormal() macros conform to ISO/IEC 9899:1999 (``ISO C99''). HISTORY
3BSD introduced isinf() and isnan() functions, which accepted double arguments; these have been superseded by the macros described above. BSD
December 11, 2006 BSD
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