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NetBSD 6.1.5 - man page for isinff (netbsd section 3)

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ISINFF(3)			   BSD Library Functions Manual 			ISINFF(3)

NAME
     isinff, isnanf -- test for infinity or not-a-number

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     int
     isinff(float);

     int
     isnanf(float);

DESCRIPTION
     The isinff() function returns 1 if the number is ``infinity'', otherwise 0.

     The isnanf() function returns 1 if the number is ``not-a-number'', otherwise 0.

SEE ALSO
     isinf(3), isnan(3), math(3)

     IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.

BUGS
     Neither the VAX nor the Tahoe floating point have distinguished values for either infinity
     or not-a-number.  These routines always return 0 on those architectures.

BSD					 August 16, 1999				      BSD
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