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ISFINITE(3) Library Functions Manual ISFINITE(3) NAME isfinite -- test for finite value LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <math.h> int isfinite(real-floating x); DESCRIPTION The isfinite() 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. IEEE 754 It is determined whether the value of x is zero, subnormal, or normal, and neither infinite nor NaN. VAX It is determined whether the value of x is true zero or finite, and neither dirty zero nor ROP. RETURN VALUES The isfinite() macro returns a non-zero value if the value of x is finite. Otherwise 0 is returned. ERRORS No errors are defined. SEE ALSO finite(3), fpclassify(3), isnormal(3), math(3), signbit(3) STANDARDS The isfinite() macro conforms to ISO/IEC 9899:1999 (``ISO C99''). NetBSD 7.1.2 August 6, 2011 NetBSD 7.1.2