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FPCLASSIFY(3) Library Functions Manual FPCLASSIFY(3) NAME 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 converted 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"). NetBSD 8.0 January 14, 2004 NetBSD 8.0