%與mod的區別:%出來的數有正有負,符號取決於左運算元。。。而mod只能是正(因為a = b * q + r (q > 0 and 0 <= r < q), then we have a mod q = r 中r要大於等於0小於q)。。。。。所以要用%來計算mod的話就要用這樣的公式:a mod b = (a % b + b) % b括弧裡的目的是把左運算元轉成正數絕大多數模數運算都會滿足 r = a - (a/b) * b。
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