Swift 向下向上取整 By Ryukie Published 2019-08-04 Contents 1. Swift 向下向上取整 Swift 向下向上取整ceil(x)返回不小于x的最小整数值(然后转换为double型)。 floor(x)返回不大于x的最大整数值。 round(x)返回x的四舍五入整数值。