Updated: 2021/Apr/14

ISNORMAL(3) Library Functions Manual ISNORMAL(3)NAMEisnormal- test for normal valueLIBRARYStandard C Library (libc, -lc)SYNOPSIS#include<math.h>intisnormal(real-floating x);DESCRIPTIONTheisnormal() 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.IEEE754It is determined whether the value of x is normal, and neither zero, subnormal, infinite nor NaN.VAXIt is determined whether the value of x is finite, and neither true zero, dirty zero nor ROP.RETURNVALUESTheisnormal() macro returns a non-zero value if the value of x is finite. Otherwise 0 is returned.ERRORSNo errors are defined.SEEALSOfpclassify(3), isfinite(3), math(3), signbit(3)STANDARDSTheisnormal() macro conforms to ISO/IEC 9899:1999 ("ISO C99"). NetBSD 9.99 October 29, 2003 NetBSD 9.99