NAME

isnan: isnand, isnanf − test for floating point NaN (Not-A-Number)

SYNOPSIS

#include <ieeefp.h>

int isnand (dsrc)
double dsrc;

int isnanf (fsrc)
float fsrc;

DESCRIPTION

isnand and isnanf return true (1) if the argument dsrc or fsrc is a NaN; otherwise they return false (0). 

Neither routine generates any exception, even for signaling NaNs. 

isnanf() is implemented as a macro included in <ieeefp.h>.

SEE ALSO

fpgetround(3C)

September 02, 1992