padding | 易学教程

Is there any way to compute the width of an integer type at compile-time?

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问题 The size of an integer type (or any type) in units of char /bytes is easily computed as sizeof(type) . A common idiom is to multiply by CHAR_BIT to find the number of bits occupied by the type, but on implementations with padding bits, this will not be equal to the width in value bits. Worse yet, code like: x>>CHAR_BIT*sizeof(type)-1 may actually have undefined behavior if CHAR_BIT*sizeof(type) is greater than the actual width of type . For simplicity, let\'s assume our types are unsigned.

web前端项目经验之《产品列表筛选》

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HTML部分  <div class="s2"> <div class="container"> <div class="pro_type"> <div class="wrap"> <h2 class="pro_tit">{$content.pr_tit}</h2> <div class="pro_seabox"> <p>{$content.pr_des}</p> <div class="pro_topline"></div>  <div class="pro_typea clearfix application"> <div class="pro_typea_lf"> <b>{$content.pro_a}</b> </div> <div class="pro_typea_rt appsecond"> {empty name="catalogNames['id']"} <a href="javascript:;" title="" data-id="all-product" id="all" class="active all">All</a> {else/} <a href="javascript:;" title="" data-id="all-product" id="all" class="all"

盒子模型

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首先，任何情况下 margin 都不包含在height和width内。而padding与边框是否包含则有两种情况。在标准盒子模型中如图：325x146便是宽高，即内容框的宽高，并不包含padding和border。这是标准盒模型的情况。非常值得注意的是：padding + margin + border + 内容 = 整个屏幕的高/宽平常出现滚动条就是因为设置了border，padding，margin。以后一定要注意这个问题。通过css样式，可以让我们更容易掌控div的高度和宽度 box-sizing:border-box; // width = 左右padding + 左右border + 内容的宽 box-sizing:content-box; // width = 内容的宽来源： https://www.cnblogs.com/CatcherLJ/p/11314975.html

How to zero pad a sequence of integers in bash so that all have the same width?

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问题 I need to loop some values, for i in $(seq $first $last) do does something here done For $first and $last , i need it to be of fixed length 5. So if the input is 1 , i need to add zeros in front such that it becomes 00001 . It loops till 99999 for example, but the length has to be 5. E.g.: 00002 , 00042 , 00212 , 012312 and so forth. Any idea on how i can do that? 回答1: In your specific case though it's probably easiest to use the -f flag to seq to get it to format the numbers as it outputs

Left padding a String with Zeros [duplicate]

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问题 This question already has answers here : How can I pad a String in Java? (29 answers) Closed 2 years ago . I\'ve seen similar questions here and here. But am not getting how to left pad a String with Zero. input: \"129018\" output: \"0000129018\" The total output length should be TEN. 回答1: If your string contains numbers only, you can make it an integer and then do padding: String.format("%010d", Integer.parseInt(mystring)); If not I would like to know how it can be done. 回答2: String

Encrypt & Decrypt using PyCrypto AES 256

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问题 I\'m trying to build two functions using PyCrypto that accept two parameters: the message and the key, and then encrypt/decrypt the message. I found several links on the web to help me out, but each one of them has flaws: This one at codekoala uses os.urandom, which is discouraged by PyCrypto. Moreover, the key I give to the function is not guaranteed to have the exact length expected. What can I do to make that happen ? Also, there are several modes, which one is recommended? I don\'t know

CSS盒子模型（框模型）

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一、如何理解盒子模型盒子模型（框模型）是css部分非常重要的一部分知识，CSS在处理网页的时候，认为每个元素都处在一个不可见的盒子中。盒子模型的构想，把所有的元素都想象成盒子，那么对网页进行布局的时候就可以理解为对盒子进行排列。至于要将相应的盒子摆放到网页相应的位置中即可完成页面布局。 CSS 盒子模型 ( Box Model ) 规定了元素框处理元素内容、内边距、边框和外边距的方式盒子模型包括 width宽度，height高度，border边框，padding内边距，margin外边距，content内容这几个部分。二、 CSS 盒子模型概述位置关系盒子模型最里面的部分是内容区域（content）；直接包裹着内容的是内边距（padding）；内边距的边缘是边框（border）；边框之外是外边框（margin），外边框默认值默认值是透明的，因此不会遮挡其后内容。三、盒子模型的组成一个盒子的实际高度、宽度：content + padding + border + margin 盒子模型中可以设置的属性有： 1、width / height : 设置的是内容区的高度和宽度（只是内容区的大小，而不是整个盒子的大小。） 2、border边框: 详细内容点击链接转到有关border属性的博客 3、padding内边距：

Difference between a View's Padding and Margin

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问题 What is the difference between a View\'s Margin and Padding? 回答1: To help me remember the meaning of padding , I think of a big coat with lots of thick cotton padding . I'm inside my coat, but me and my padded coat are together. We're a unit. But to remember margin , I think of, " Hey, give me some margin! " It's the empty space between me and you. Don't come inside my comfort zone -- my margin. To make it more clear, here is a picture of padding and margin in a TextView : xml layout for the

How can I pad a String in Java?

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问题 Is there some easy way to pad Strings in Java? Seems like something that should be in some StringUtil-like API, but I can\'t find anything that does this. 回答1: Apache StringUtils has several methods: leftPad, rightPad, center and repeat. But please note that — as others have mentioned and demonstrated in this answer — String.format() and the Formatter classes in the JDK are better options. Use them over the commons code. 回答2: Since Java 1.5, String.format() can be used to left/right pad a

When to use margin vs padding in CSS [closed]

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问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed last year . When writing CSS, is there a particular rule or guideline that should be used in deciding when to use margin and when to use padding ? 回答1: TL;DR: By default I use margin everywhere, except when I have a border or background and want to increase the space inside that visible