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012-floating-point.md : NaN != NaN はtrue？ #157

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sukeya opened this issue Aug 4, 2021 · 0 comments

sukeya commented Aug 4, 2021

012-floating-point.mdのNaN(Not a Number)の節で、

// false
bool d = NaN != NaN ;

とあります(コードから抜粋)。しかし、このサイトの例でgcc 11.1(C++20)を選び、

std::cout << "NaN != NaN? " << std::boolalpha
<< ( std::numeric_limits::quiet_NaN()
!= std::numeric_limits::quiet_NaN() ) << '\n';

を追記し、実行するとtrueになりました。
NaN != NaN はtrueではないでしょうか？

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