Updated: 2021/Apr/14

ISFINITE(3) Library Functions Manual ISFINITE(3)NAMEisfinite- test for finite valueLIBRARYStandard C Library (libc, -lc)SYNOPSIS#include<math.h>intisfinite(real-floating x);DESCRIPTIONTheisfinite() determines whether its argument x has a finite 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 zero, subnormal, or normal, and neither infinite nor NaN.VAXIt is determined whether the value of x is true zero or finite, and neither dirty zero nor ROP.RETURNVALUESTheisfinite() macro returns a non-zero value if the value of x is finite. Otherwise 0 is returned.ERRORSNo errors are defined.SEEALSOfinite(3), fpclassify(3), isnormal(3), math(3), signbit(3)STANDARDSTheisfinite() macro conforms to ISO/IEC 9899:1999 ("ISO C99"). NetBSD 9.99 August 6, 2011 NetBSD 9.99