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ISNAN(3) Library Functions Manual ISNAN(3)NAMEisnan-- test for not-a-numberLIBRARYStandard C Library (libc, -lc)SYNOPSIS#include<math.h>intisnan(real-floating x);DESCRIPTIONTheisnan() macro determines whether its argument x is not-a-number (``NaN''). An argument represented in a format wider than its semantic type is converted to its semantic type first. The determination is then based on the type of the argument.IEEE754It is determined whether the value of x is a NaN.VAXNaNs are not supported.RETURNVALUESTheisnan() macro returns a non-zero value if the value of x is a NaN. Otherwise 0 is returned.SEEALSOfpclassify(3), isfinite(3), isinf(3), isinff(3), isnanf(3), isnormal(3), math(3), signbit(3) IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.STANDARDSTheisnan() macro conforms to ISO/IEC 9899:1999 (``ISO C99''). NetBSD 7.1.2 March 5, 2004 NetBSD 7.1.2