.TH isnand 3m RISC.SH Nameisnand, isnanf \- test for floating point NaN (Not-A-Number).SH Syntax.B\#include <ieeefp.h>.PP.B int isnand (dsrc).br.B double dsrc;.PP.B int isnanf (fsrc).br.B float fsrc;.SH DescriptionThe.PN isnand and .PN isnanfroutines return the value 1 for true if the argument dsrc or fsrc is a NaN; otherwise they return the value 0 for false.  .PPNeither routine generates any exception, even for signaling NaNs..PPThe.PN isnanfunction is implemented as a macro included in <ieeefp.h>.