float point exception

NoFloatException.cpp

// see http://www.johndcook.com/IEEE_exceptions_in_cpp.html for details

bool IsNumber(double x) 
{
        // This looks like it should always be true, 
        // but it's false if x is a NaN.
        return (x == x); 
}

#include <float.h>

bool IsFiniteNumber(double x) 
{
        return (x <= DBL_MAX && x >= -DBL_MAX); 
}