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地板和天花板函數(shù) 定義1地板函數(shù)?x?:最大整數(shù)≤x。 示例2?3.99?= 3,?5/2?= 2,?3?= 3 定義3天花板函數(shù)?x?:最小整...
數(shù)據(jù)保密(data confidentiality) 對(duì)傳輸或存儲(chǔ)在系統(tǒng)中的數(shù)據(jù)進(jìn)行加密宰啦,保護(hù)數(shù)據(jù)的機(jī)密性意味著防止未經(jīng)授權(quán)的數(shù)據(jù)讀取 加密與解...