ISINF(3) BSD Programmer's Manual ISINF(3)
isinf - test for infinity
#include <math.h> int isinf(real-floating x);
The isinf() macro determines whether its argument x is an infinity (posi- tive or negative). An argument represented in a format wider than its se- mantic type is converted to its semantic type first. The determination is then based on the type of the argument.
It is determined whether the value of x is an infinity.
Infinities are not supported.
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), math(3), signbit(3) IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.
The isinf() macro conforms to ISO/IEC 9899:1999 ("ISO C99"). MirOS BSD #10-current March 5, 2004 1
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