IEEE Std 1003.1, 2004 Edition

Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

isfinite - test for finite value

#include <math.h>

int isfinite(real-floatingx);

^{[CX]}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.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

isfinite() macro shall return a non-zero value if and only if its argument has a finite value.

No errors are defined.

None.

None.

None.

None.

fpclassify(),isinf(),isnan(),isnormal(),signbit(), the Base Definitions volume of IEEE Std 1003.1-2001<math.h>

First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.

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