overflow | 易学教程

unsigned overflow with modulus operator in C

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问题 i encountered a bug in some c code i wrote, and while it was relatively easy to fix, i want to be able to understand the issue underlying it better. essentially what happened is i had two unsigned integers (uint32_t, in fact) that, when the modulus operation was applied, yielded the unsigned equivalent of a negative number, a number that had been wrapped and was thus "big". here is an example program to demonstrate: #include <stdio.h> #include <stdint.h> int main(int argc, char* argv[]) {

Overflow-x: hidden also hides vertical content too

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问题 I have a DIV measuring 400px wide, containing two DIVs side-by-side, each with width of 400px and height of 600px. The width of both DIVs is fixed, however the height can vary. I'd like to hide the second DIV and show the first completely, with no scrolling inside the DIV. My solution, I thought, was to hide the overflow-x. This seems to also hide the y overflow too. Here's my code: #schools-sub-nav { } #schools-container { width: 400px; /* Set the width of the visible portion of content here

How do I stop users from being able to scroll horizontally on my site

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问题 Here's the site: http://joshnh.com/ Basically, I have a few elements that are super wide so that they look as though they are coming out from the right hand side of the screen. I'm then using overflow-x: hidden; on the body to hide the overflow, but that doesn't stop the page from horizontally scrolling when users use their trackpad, or click and drag their mouse to the right. The site is fluid, so setting overflow-x: hidden; isn't a problem, but it has to be set on the body / html tags, not

css margin:auto not centering div in webkit browsers (Chrome and Safari) when maximised/full screen

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问题 I have been unable to determine the cause of this problem, so I can not display a test case, instead I have narrowed down my code to a page that still contains the fault without too much extra. Here is the link: http://www.richard-walsh.limewebs.com/Disk-Edits/index.html The problem is that the content div (id=content), is not centering in Chrome and Safari. It is positioned to the right. The content div is surrounded by a div called bottom, whose width:100%; and height:auto;. #bottom{ width

Is this vulnerable to a stack overflow?

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问题 void gctinp (char *inp, int siz) { puts ("Input value: "); fgets (inp, siz, stdin); printf ("buffer3 getinp read %s", inp); } From what I've read, fgets is supposed to be used when you want to limit the size of input. So this code shouldn't be vulnerable right? It is being called like so: int main (int argc, char *argv[]) { char buf[16]; getinp (buf, sizeof (buf)); display (buf); printf ("buffer3 done\n"); } Thanks for your time. 回答1: You won't strike buffer overflow problems if you enter

Most succinct implementation of a floating point constraint function with wrap-around overflow

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问题 I'm looking for the most succinct and general implementation of the following function: float Constrain(float value, float min, float max); Where Constrain() bounds value in the range [min, float) . Ie, the range includes min but excludes max and values greater than max or less than min wrap around in a circle. Ie, in a similar way to integers over/underflow. The function should pass the following tests: Constrain( 0.0, 0.0, 10.0) == 0.0 Constrain( 10.0, 0.0, 10.0) == 0.0 Constrain( 5.0, 0.0,

Is there a function like numpy.clip(a, a_min, a_max) where values outside a_min and a_max are wrapped rather than saturated?

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问题 For a given integer numpy array, I can saturate values in this array to an arbitrary min and max using numpy.clip(a,a_min,a_max). I was wondering if there is a numpy function or trick to doing this so that instead of saturating the values, it wraps them. I know that if I make a numpy array with a certain integer dtype (for example: int8), then I will have this wrapping behaviour for values outside of [-128,128). However, I want to have customisable bounds, i.e., how would I wrap values in an

解决滚动条挤压页面宽度

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转载： https://blog.csdn.net/weixin_34112208/article/details/88731678 解决办法如下： html { overflow-y: scroll; //这是为了兼容ie8，不支持:root, vw } :root { overflow-y: auto; overflow-x: hidden; } :root body { position: absolute; } body { width: 100vw; overflow: hidden; 来源： CSDN 作者：安康全是山链接： https://blog.csdn.net/k912120/article/details/103804960

谷歌下设置滚动条的css样式

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.oLi-lists-scroll::-webkit-scrollbar { width:5px; padding:1px; background:url(../images/repeat-bar.png) repeat-y;} /* Track */ .oLi-lists-scroll::-webkit-scrollbar-track {height:4px;} /* Handle */ .oLi-lists-scroll::-webkit-scrollbar-thumb { background:url(../images/repeat-bar01.png) repeat-y; border-radius:2px; width:4px; border-left:1px solid #bfc8d2} 在设置overflow-y:auto的情况下，实现当内容多的时候加上滚动条，内容少的时候，去掉滚动条： <div class="a b">内容</div> .a{ overflow:hidden} .a.b{overflow-y:auto}; 来源： https://www.cnblogs.com/jiangtuzi/p/3758373.html

手机端禁止页面滑动

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今天在做页面弹层时遇到个问题，在浏览器模拟机中，可以用 1 $("body").css("overflow", "auto"); 2 $("body").css("overflow", "hidden"); 控制背景的是否滑动，但是在真机测试时傻眼了，经过各种百度以及尝试，最终搞定，以下是代码 //定义阻止事件传递 function eventStop (event){ 　　event.preventDefault(); } //隐藏弹层，设置页面可滑动 $("body").css("overflow", "auto");document.body.removeEventListener('touchmove',eventStop,false); //显示弹层，设置页面不可滑动 $("body").css({"height":"100%","overflow":"hidden"}); document.body.addEventListener('touchmove',eventStop,false); 来源： https://www.cnblogs.com/DSH-/p/10282284.html