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# isinf

From cppreference.com
< c‎ | numeric‎ | math

Defined in header `<math.h>` |  |
#define isinf(arg) /* implementation defined */ |  | (since C99)

Determines if the given floating point number `arg` is positive or negative infinity. The macro returns an integral value.

### [edit] Parameters

arg | - | floating point value

### [edit] Return value

Nonzero integral value if `arg` is infinite, ​0​ otherwise.

### [edit] See also

fpclassify (C99) | categorizes the given floating point value (function) [edit]
isfinite (C99) | checks if the given number has finite value (function) [edit]
isnan (C99) | checks if the given number is NaN (function) [edit]
isnormal (C99) | checks if the given number is normal (function) [edit]
C++ documentation for isinf

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