floor

php floor()函数 语法

◇◆丶佛笑我妖孽 提交于 2019-12-04 20:10:43
php floor()函数 语法 floor函数是什么意思? php floor()函数用来向下舍入为最接近的整数。语法是floor(number),表示返回不大于参数number的下一个整数,有小数部分则直接舍去取整。 直线电机参数 作用:向下舍入为最接近的整数。 语法:floor(number) 参数: 参数描述number必须,一个数 说明:返回不大于参数number的下一个整数,有小数部分则直接舍去取整。 php floor()函数 示例 <?php $i = 66.7; $i = floor($i); $j = -66.7; $j = floor($j); echo $i."*****".$j ?>    来源: https://www.cnblogs.com/furuihua/p/11881162.html

javascript 解决默认取整的坑(目前已知的最佳解决方案)

余生长醉 提交于 2019-12-04 18:28:49
javascript 解决默认取整的坑(目前已知的最佳解决方案) 复现该问题 js在数字操作时总会取更高精度的结果,例如 1234/10 结果就是 123.4 ,但是在c或者java中整数除以10的结果还是整数,小数部分被舍去,不仅如此 * , % 等运算符也会出现这种结果,但我们有时候更希望舍去取整 使用Math标准库 Math标准库提供了 Math.floor():向下取整Math.ceil():向上取整Math.round():四舍五入 这三种取整方法,效率也不错,但是在进行一些操作时,总感觉别扭,而且效率会偏低,查看了v8中Math部分的源码后发现需要进行非常多的操作后才能得到结果 //builtins-math-gen.cc文件中声明了math库的所有方法 // ES6 #sec-math.floor TF_BUILTIN(MathFloor, MathBuiltinsAssembler) { TNode<Context> context = CAST(Parameter(Descriptor::kContext)); TNode<Object> x = CAST(Parameter(Descriptor::kX)); MathRoundingOperation(context, x, &CodeStubAssembler::Float64Floor); } //

Taking the floor of a float

删除回忆录丶 提交于 2019-12-03 06:30:27
问题 I have found two ways of taking floors in Python: 3.1415 // 1 and import math math.floor(3.1415) The problem with the first approach is that it return a float (namely 3.0 ). The second approach feels clumsy and too long. Are there alternative solutions for taking floors in Python? 回答1: As long as your numbers are positive, you can simply convert to an int to round down to the next integer: >>> int(3.1415) 3 For negative integers, this will round up, though. 回答2: You can call int() on the

How do I create a new Joda DateTime truncated to the last hour? [duplicate]

这一生的挚爱 提交于 2019-12-03 04:17:16
This question already has answers here : JodaTime equivalent of DateUtils.truncate() (4 answers) I am pulling timestamps from a file that I want to create a new DateTime for, but I want to create the DateTime at the floor of the hour (or any Joda Period will do). How Can I do this? Wohoo, found it. Simple like everything in Joda once I traced down the calls. DateTime dt = new DateTime().hourOfDay().roundFloorCopy(); 来源: https://stackoverflow.com/questions/1207957/how-do-i-create-a-new-joda-datetime-truncated-to-the-last-hour

Avoiding Calls to floor()

我只是一个虾纸丫 提交于 2019-12-03 02:45:54
I am working on a piece of code where I need to deal with uvs (2D texture coordinates) that are not necessarily in the 0 to 1 range. As an example, sometimes I will get a uv with a u component that is 1.2. In order to handle this I am implementing a wrapping which causes tiling by doing the following: u -= floor(u) v -= floor(v) Doing this causes 1.2 to become 0.2 which is the desired result. It also handles negative cases, such as -0.4 becoming 0.6. However, these calls to floor are rather slow. I have profiled my application using Intel VTune and I am spending a huge amount of cycles just

ceil()方法

匿名 (未验证) 提交于 2019-12-02 23:43:01
对一个数进行上舍入。 console.log(Math.floor(0.60)) // 0 console.log(Math.floor(0.40)) // 0 console.log(Math.floor(5)) // 5 console.log(Math.floor(5.1)) // 5 console.log(Math.floor(-5.1)) // -6 console.log(Math.floor(-5.9)) // -6 文章来源: https://blog.csdn.net/qq_33650655/article/details/91991077

tf.math.floor或tf.floor

匿名 (未验证) 提交于 2019-12-02 23:42:01
返回不大于x的元素最大整数。 参数: 返回值: 一个张量。与x类型相同。 https://tensorflow.google.cn/versions/r1.11/api_docs/python/tf/math/floor?hl=en 文章来源: https://blog.csdn.net/weixin_36670529/article/details/91811748

js 做的随机8位验证码

匿名 (未验证) 提交于 2019-12-02 23:40:02
  开发思路:   画出放置验证码的模块、一个写有“看不清…”的小块,以及输入验证码的文本框   获取各个模块   封装一个函数Yan_ma(),设置验证码为8位,里面含有数字,小写字母,小写字母和中文。每种类型出现的可能性为25%。   随机数字在0-9,之间。对Math.ramand()向下取整。   随机大小写字母使用fromCharCode() 方法:将 Unicode 编码转为一个字符,例如:   var n = String.fromCharCode(65);   cosole.log(n);   //输出j结果为A   大写字母(65-91) 小写字母(97-123)   var s = String.fromCharCode(Math.floor(Math.random() * 26 + 65));   var s = String.fromCharCode(Math.floor(Math.random() * 26 + 97));   随机中文,声明变量letter放置中文字符串,使用charAt()随机在letter中获得某个汉字。   var letter = "如若可以亲爱的请许我青灯墨下执一笔素笺今生为你吟尽千回百转念";   var s = letter.charAt(Math.floor(Math.random() * letter.length));

C++学习之floor函数,ceil函数和round函数

非 Y 不嫁゛ 提交于 2019-12-02 23:15:04
做题时经常需要截断小数点,向上取整或者向下取整,以前使用printf("%.2f",n);进行截断操作,但如果数据不需要输出,这种做法就行不通了,此时可以使用floor函数向下取整或者ceil函数向上取整。 头文件:#include<cmath> 一.floor() 函数(向下取整) 1、函数原型: double floor ( double x ); float floor ( float x ); long double floor ( long double x ); 2、功能:返回一个小于传入参数的最大整数 3、参数:x为将来被处理的数 4、返回值:返回不大于x的最大整数 5、注在C语言中只有double一个原型 6、示例程序 #include <cstdio> #include <cmath> int main () { printf ("floor of 2.3 is %.1lf/n", floor (2.3) ); printf ("floor of 2.6 is %.1lf/n", floor (2.6) ); printf ("floor of -2.3 is %.1lf/n", floor (-2.3) ); printf ("floor of -2.6 is %.1lf/n", floor (-2.6) ); return 0; } 输出: floor of