isinf - test for infinity
c99 [ flag... ] file... –lm [ library... ] #include <math.h> int isinf(real-floating x);
The isinf() macro determines whether its argument value is an infinity (positive or negative). First, an argument represented in a format wider than its semantic type is converted to its semantic type. Then determination is based on the type of the argument.
The isinf() macro returns a non-zero value if and only if its argument has an infinite value.
No errors are defined.
See attributes(7) for descriptions of the following attributes:
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math.h(3HEAD), fpclassify(3M), isfinite(3M), isnan(3M), isnormal(3M), signbit(3M), attributes(7), standards(7)