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Uploaded by
Yuya Kaneda
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桁あふれ
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桁あふれ
1.
・1900年1月1日0時0分0秒を0とした時に、32ビットで桁あふれが起きる のは何年後であるか 32ビットで桁あふれを起こすのは、
=4,294,967,296ミリ秒 の時である。 また、1年で、 1000×60×60×24=86,400,000ミリ秒 である為、49.710269年後、つまり、50年後に桁あふれが起きる。 ここで、途中の計算過程を簡単にするには、全国大会に出る 人は、最低でも =1024くらいは覚えているはずであるから、 1024×1024×1024×4=4,294,967,296 と、4回の筆算で を求める事ができるはずである。 さらに、 60×60=3600 は見た目で一瞬で出せる為、 3600×24=86,400ミリ秒 と2回の筆算を行う事で求める事ができ、あとは、割り算をすれば答えを 出す事ができる。
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