Objective-C拓展了C,自然很多用法是和C一致的.比如浮点数转化成整数,就有以下四种情况. 1.简单粗暴,直接转化 float f = 1.5; int a; a = (int)f; NSLog("a = %d",a); 输出结果是1.(int)是强制类型转化,丢弃浮点数的小数部分. 2.高斯函数,向下取整 float f = 1.6; int a; a = floor(f); NSLog("a = %d",a); 输出结果是1.floor()方法是向下取整
SELECT round(52.45, 0) AS round4, round(52.54, 0) AS round5, round(52.45, 1) AS round41, round(52.54, 1) AS round51, floor(52.4) AS floor4, floor(52.5) AS floor5, ceiling(52.4) AS ceiling4, ceiling(52.5) AS ceiling5 round是四舍五入 floor是向下取整 ceiling 是向上取
向上取整 ceil() 函数返回数字的向上取整整数,就是返回大于等于变量的最近的整数. ceil()是不能直接访问的,需要导入 math 模块. import math math.ceil( x ) 向下取整 floor(x) 返回数字的下舍整数,小于或等于 x. floor()是不能直接访问的,需要导入 math 模块. import math math.floor( x )
在erlang的API中,erlang:trunc/1 是就近取整,erlang:round/1是四舍五入的, 整理下:对于正数的向上和向下取整, %% 向上取整 ceil(N) -> T = trunc(N), case N == T of true -> T; false -> 1 + T end. %% 向下取整 floor(X) -> T = trunc(X), case (X < T) of true -> T - 1; _ -> T end. 而对于负