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What is the purpose of the function ?
bool whatIsIt(double n)
{
return n == n;
}
It can be used to check every bit in n ?
I doubt that .
Any comments are appreciated.
It could be used to check if n is NaN (not a number), since NaN does not compare equal to itself.
Probably a finnicky and not entirely reliable way to do it. (see Billy’s various comments) C99 and C++11 have the
isnan()function.