/*
public static double abs(double num);获取绝对值
public static double ceil(double num);向上取整
public static double floor(double num);向下取整
public static long round(double num);四舍五入
*/
/*
public static double abs(double num);获取绝对值
public static double ceil(double num);向上取整
public static double floor(double num);向下取整
public static long round(double num);四舍五入
*/
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