(atof "97.1") 97.1 (atof "3") 3.0 (atof "-3.9") -3.9 (atof "0.0") 0.0 (atof "2x2") 2.0 (atof "100a200") 100.0 (atof "100a200") 0.0 (atof "あ?") 0.0
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