Floating-point special values
The numeric conversion functions accept the following special values at all times:
- ±inf or ±INF
- ±nanq or ±nanq(n-char-sequence), and ±NANQ or ±NANQ(n-char-sequence)
- ±nans or ±nans(n-char-sequence), and ±NANS or ±NANS(n-char-sequence)
- ±nan or ±nan(n-char-sequence), and ±NAN or ±NAN(n-char-sequence)
Note: Neither the z/OS® XL C/C++ compiler nor the Language Environment® C/C++
runtime library includes _Imaginary or formal support of
the IEC 60559 floating point as described in Annex F and Annex G of
the C99 standard.