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JavaScript Integer math incorrect results

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I am just trying to implement a simple RNG in JS. What's happening is javascript evaluates 119106029 * 1103515245 to be 131435318772912110 rather than 131435318772912105 . We know it's wrong since two odd numbers multiplied does not give an even number. Anyone know what's up? I just want a reliable repeatable RNG, and because of these incorrect values I can't get results to match up with my C implementation of the same thing. Per the ECMAScript standard, all numbers in JavaScript are (64-bit IEEE 754) floating-point numbers. However all 32-bit integers can be exactly represented as floating

C integer overflow behaviour when assigning to larger-width integers

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问题 If I execute the following code in C: #include <stdint.h> uint16_t a = 4000; uint16_t b = 8000; int32_t c = a - b; printf("%d", c); It correctly prints '-4000' as the result. However, I'm a little confused: shouldn't there be an arithmetic overflow when subtracting a larger unsigned integer from the other? What casting rules are at play here? This question seems a bit noobish, so any references would be greatly appreciated. 回答1: The issue is actually somewhat complicated. Operands of

JQuery / JS : Detect user's scroll attempt without any window overflow to scroll to

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问题 I'm working on a transitioning website, and while I want to use the user's scroll attempt as the transition initiator, I don't want there to be a window scroll bar. Right now, I'm simply detecting that the user scrolls (I've made my window size 1px taller that the user's screen for a scrollbar, although this is what I'm trying to avoid) with jquery's .scroll(function) method, and using that to transition my page, but I'd like to detect the user's scroll attempt without having to make my page

Webview iframe overflow

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I'm currently building a web app in android. My app runs in a webview, and loads third-party contents through iframes. The iframe size is fixed and supposed not to be changed by the content loaded. In desktop Chrome browser, it works fine and the overflow part of loaded content can be scrolled via scrollbars. However, in android webview, the iframe tends to resize itself based on the contents loaded, which leads to a mess of the page layout. Has anyone else encountered the same problem? Tony. In my opinion, the key point of this trick is that you have to fix the height of the iframe. Then you

overflow: hidden; doesn't work on Chrome with IFRAMEs?

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I have an IFRAME with overflows hidden in the css and html. It works in Firefox, but not Chrome/Safari Why is this? Right, how about: <iframe scrolling="no" src="http://www.google.com" width="400px" height="300"></iframe> as in the scrolling="no" http://jsfiddle.net/neSBS/ After a pretty big research I've done on this subject I would like to post my answer, which I suggest, could be an addition to Joonas's answer: <style> iframe { overflow:hidden; } </style> (...) <iframe scrolling="no" src="http://www.google.com" width="400px" height="300"></iframe> I think, both scrolling and overflow:hidden

前端学习（十四）：CSS布局

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进击のpython 前端学习——CSS布局每个模块的相关央视就算是进本上都完成了，但是，这些模块想放在不同的位置横着放，竖着放，斜着放... ... 想怎么放怎么放那就用到了今天要说的CSS布局了浮动浮动介绍浮动是网页布局中非常重要的一个属性。那么浮动这个属性一开始设计的初衷是为了网页的文字环绕效果，如图所示: 如果我们用之前讲解的内容，来实现上述显示的效果，这是很难实现的！！！另外之前咱们学习了标签的分类，每类标签都是有它自己的特点，比如块级标签独占一行，哎呀，突然有个idea 如果让两个div在一排内显示，那怎么办，可能有的同学又说了，display属性啊，把他们设置成inline-block 好吧，同如果你能想到这里，证明对咱们的知识点理解的还算透彻，但是呢你又会发现，如果用你刚刚那种效果展示，如图所示：仅仅的这点间隙，到底是多大呢，如果我们在一行内计算整个盒模型的宽度的话，是否又计算的精准呢？所以，你意淫出来的想法是不对的！！！！！！浮动属性浮动：css样式表中用float来表示：属性值描述 none 表示不浮动，所有之前讲解的HTML标签默认不浮动 left 左浮动 right 右浮动 inherit 继承父元素的浮动属性 DOCTYPE html> <html lang="en"> <head> <meta charset="UTF

ie6、ie7、ie8中overflow:hidden无效解决办法

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产生原因：当父元素的直接子元素或者下级子元素的样式拥有position:relative属性时，父元素的overflow:hidden属性就会失效。解决办法：我们在IE 6内发现子元素会超出父元素设定的高度，即使父元素设置了overflow:hidden。解决这个bug很简单，在父元素中使用position:relative;即可解决该bug 实例：在太湖站中body背景图超出隐藏使用overflow-x:hidden，IE7不生效！在body中加position:relative,完美解决！转载请注明：前端录 »ie6、ie7、ie8中overflow:hidden无效解决办法 <script src="http://www.wozhuye.com/index.php?m=digg&c=index&a=init&id=3-288-2"></script> 来源： https://blog.csdn.net/lumot/article/details/100996643

Issue with scrolling in iOS 5 using -webkit-overflow-scrolling

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I have an HTML page with a fixed-height div which should be scrollable (only vertically). In iOS 5 this can be achieved using: overflow-y: auto; -webkit-overflow-scrolling: touch; The div contains an unordered list with about 10 items. The scrolling works, but sometimes it scrolls only if I swipe my finger diagonally or even horizontally and not vertically as it should be. I'm wondering if anyone has encountered this issue. I don't want to think that it is a bug in iOS5, but I can't figure out what I'm doing wrong because most of the time it works fine. I had exactly the same issue. The

Warning : overflow in implicit constant conversion

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问题 In the following program, the line 5 does give overflow warning as expected, but surprisingly the line 4 doesn't give any warning in GCC: http://www.ideone.com/U0BXn int main() { int i = 256; char c1 = i; //line 4 char c2 = 256; //line 5 return 0; } I was thinking both lines should give overflow warning. Or is there something I'm missing? The topic which led me to do this experiment is this: typedef type checking? There I said the following(which I deleted from my answer, because when I run

DIV CSS浏览器的兼容性

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1. 文字本身的大小不兼容。同样是font-size:14px的宋体文字，在不同浏览器下占的空间是不一样的，ie下实际占高16px，下留白3px，ff 下实际占高17px，上留白1px，下留白3px，opera下就更不一样了。解决方案：给文字设定 line-height 。确保所有文字都有默认的 line-height 值。这点很重要，在高度上我们不能容忍1px 的差异。 2.ff下容器高度限定，即容器定义了height之后，容器边框的外形就确定了，不会被内容撑大，而ie下是会被内容撑大，高度限定失效。所以不要轻易给容器定义height。 3.横向上的撑破容器问题，。如果float 容器未定义宽度，ff下内容会尽可能撑开容器宽度，ie下则会优先考虑内容折行。故，内容可能撑破的浮动容器需要定义width。小实验：有兴趣大家可以看看这段实验。在不同浏览器下分别测试以下各项代码。 a.<div style=”border:1px solid red;height:10px”></div> b. <div style=”border:1px solid red;width:10px”></div> c. <div style=”border:1px solid red;float:left”></div> d. <div style=”border:1px solid red

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