size | 易学教程

Fit website background image to screen size

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问题 I'm just starting on a website and I already encounter a small problem where I can't find a specific solution to. I wanted to make my website background fit any screen size in width, height does not matter. This is the link to my image: ../IMAGES/background.jpg EDIT I have no idea what's wrong, but for some reason the body doesn't even want to get the background image. It just displays a plain white background. body {background-image:url(../IMAGES/background.jpg);} 回答1: you can do this with

Maximum table size for a MySQL database

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问题 What is the maximum size for a MySQL table? Is it 2 million at 50GB? 5 million at 80GB? At the higher end of the size scale, do I need to think about compressing the data? Or perhaps splitting the table if it grew too big? 回答1: I once worked with a very large (Terabyte+) MySQL database. The largest table we had was literally over a billion rows. It worked. MySQL processed the data correctly most of the time. It was extremely unwieldy though. Just backing up and storing the data was a

What is the underlying type of a c++ enum?

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This may have been answered elsewhere but I could not find a suitable response. I have this code: enum enumWizardPage { WP_NONE = 0x00, WP_CMDID = 0x01, WP_LEAGUES = 0x02, WP_TEAMS = 0x04, WP_COMP = 0x08, WP_DIVISIONS = 0x10, WP_FORMULAS = 0x20, WP_FINISHED = 0x40, }; Which is legacy and I have to modify it by adding a few new values. The issue is each value must be a unique bit so they may be OR combined to a bitmap. The values are set using the #x## hex format, but I'm wondering if this is the max it can store? What will be the effect, if any, if I change my code to enum enumWizardPage { WP

jquery填充表格

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<table class="commonTable" id="softTable"> <thead> <tr> <th>软件名称</th> <th width="100px" class="textRight">大小(KB)</th> <th width="80px" class="textRight">发布时间</th> <th width="40px"></th> </tr> </thead> <tbody> <tr class="template" id="templateRow"> <td name="softName"></td> <td class="textRight" name="size"></td> <td class="textRight" name="publicDate"></td> <td name="download"></td> </tr> // 临时列表数据 var softJson = [ { "softName" : "", "size" : "203,151.12", "publicDate" : "2012-12-25", "download" : 1 }, { "softName" : "", "size" : "1,203,151.12", "publicDate" : "2013-12-25", "download" : 1 }, {

Why class size depend only on data members and not on member functions?

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问题 I want to know the detail description on the size of a class. I want to know if there is only data members & member function without any virtual keyword then why the class size depends only on data members. For an eg: class A { int a; public: int display() { cout << "A=" << a << endl; } }; When I check the sizeof(A) i found that it is 4 byte. Why it is so? Why member function has no effect on the size of class A? Thanks 回答1: Because the class's functions are not saved inside the object itself

滑动窗口的最大值

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题目描述给定一个数组和滑动窗口的大小，找出所有滑动窗口里数值的最大值。例如，如果输入数组{2,3,4,2,6,2,5,1}及滑动窗口的大小3，那么一共存在6个滑动窗口，他们的最大值分别为{4,4,6,6,6,5}；针对数组{2,3,4,2,6,2,5,1}的滑动窗口有以下6个： {[2,3,4],2,6,2,5,1}， {2,[3,4,2],6,2,5,1}， {2,3,[4,2,6],2,5,1}， {2,3,4,[2,6,2],5,1}， {2,3,4,2,[6,2,5],1}， {2,3,4,2,6,[2,5,1]}。无脑法： def maxInWindows(self, num, size): # write code here l = [] if size <= 0: return l n = len(num) - size + 1 for i in range(n): temp = max(num[i:i+size]) l.append(temp) return l 维护一个队列，从后面依次弹出队列中比当前num值小的元素，同时也能保证队列首元素为当前窗口最大值下标；当当前窗口移出队首元素所在的位置，即队首元素坐标对应的num不在窗口中，需要弹出；把每次滑动的num下标加入队列。当滑动窗口首地址i大于等于size时才开始写入窗口最大值到最终输出res。 def

Why is the size of a function in C always 1 byte?

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When we check the size of a function using sizeof() , we always get 1 byte . What does this 1 byte signify? Kerrek SB It's a constraint violation, and your compiler should diagnose it. If it compiles it in spite of that, your program has undefined behaviour [thanks to @Steve Jessop for the clarification of the failure mode, and see @Michael Burr's answer for why some compilers allow this]: From C11, 6.5.3.4./1: The sizeof operator shall not be applied to an expression that has function type This is not undefined behavior - the C language standard requires a diagnostic when using the sizeof

Maximum Thread Stack Size .NET?

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问题 What is the maximum stack size allowed for a thread in C#.NET 2.0? Also, does this value depend on the version of the CLR and/or the bitness (32 or 64) of the underlying OS? I have looked at the following resources msdn1 and msdn2 public Thread( ThreadStart start, int maxStackSize ) The only information I can see is that the default size is 1 megabytes and in the above method, if maxStackSize is '0' the default maximum stack size specified in the header for the executable will be used, what's

How heavy is QObject really? [duplicate]

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问题 This question already has answers here : Getting the size of a Qt Object (4 answers) How big is QObject? [duplicate] Closed 6 years ago . I recently posted a question about the overhead of QObject in typical usage scenarios, but unfortunately the question got closed as a duplicate of another question that didn't technically answer the question. What is worse, the hasty "Samaritans" who politely rushed to close my question interrupted the answer I was just finishing typing after running a few

std::string length() and size() member functions

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I was reading the answers for this question and found that there is actually a method called length() for std::string (I always used size() ). Is there any specific reason for having this method in std::string class? I read both MSDN and CppRefernce, and they seem to indicate that there is no difference between size() and length() . If that is so, isn't it making more confusing for the user of the class? As per the documentation , these are just synonyms. size() is there to be consistent with other STL containers (like vector , map , etc. ) and length() is to be consistent with most peoples'