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ISNORMAL(3) Library Functions Manual ISNORMAL(3) NAME isnormal - test for normal value LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <math.h> int isnormal(real-floating x); DESCRIPTION The isnormal() macro determines whether its argument x has a normal value. An argument represented in a format wider than its semantic type is converted to its semantic type first. The determination is then based on the type of the argument. IEEE 754 It is determined whether the value of x is normal, and neither zero, subnormal, infinite nor NaN. VAX It is determined whether the value of x is finite, and neither true zero, dirty zero nor ROP. RETURN VALUES The isnormal() macro returns a non-zero value if the value of x is finite. Otherwise 0 is returned. ERRORS No errors are defined. SEE ALSO fpclassify(3), isfinite(3), math(3), signbit(3) STANDARDS The isnormal() macro conforms to ISO/IEC 9899:1999 ("ISO C99"). NetBSD 8.0 October 29, 2003 NetBSD 8.0