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ISINF(3) NetBSD Library Functions Manual ISINF(3)
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isinf -- test for infinity
Standard C Library (libc, -lc)
The isinf() macro determines whether its argument x is an infinity (posi-
tive or negative). 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.
The isinf() macro returns a non-zero value if the value of x is an infin-
ity. Otherwise 0 is returned.
fpclassify(3), isfinite(3), isinff(3), isnan(3), isnanf(3), isnormal(3),
IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.
The isinf() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').
On VAX the isinf() function always returns 0, as the architecture doesn't
have a representation for infinity.
NetBSD 10.99 September 27, 2017 NetBSD 10.99