-1.#IND00
int _finite(double x)を使う.math.hをインクルードすれば使える.
xが(正・負)の無限の時FALSE,それ以外TRUE
http://www.linux.or.jp/JM/html/LDP_man-pages/man3/fpclassify.3.html
http://www.linux.or.jp/JM/html/LDP_man-pages/man3/finite.3.html
http://www.aerith.net/cpp/typical_bug-j.html
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