isfinite (original) (raw)
[CX] ![[Option Start]](http://www.opengroup.org/onlinepubs/009695399/images/opt-start.gif)
The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard. ![[Option End]](http://www.opengroup.org/onlinepubs/009695399/images/opt-end.gif)
The isfinite() macro shall determine whether its argument has a finite value (zero, subnormal, or normal, and not infinite or NaN). 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 following sections are informative.
End of informative text.