clear | 易学教程

How do I clear an array in C?

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问题 char x [1000]; x = 'hello'; What would I use to clear the contents of x ? I'm not able to re-initialise it, use strcpy(x, '/0') or free() . 回答1: You cannot assign anything to an array, which your variable x is. So therefore anything that starts with x = is wrong. Secondly 'hello' is not a string, it is a multicharacter literal which is of type int , so this doesn’t make sense either. A string literal is enclosed by " while character (or multicharacter) literals are enclosed by ' . So if you

Clear form fields after validation errors in Spring 3

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问题 Is there (there must be?) a way to clear a form field that has validation errors in Spring 3? I know that clearing the "command" object properties works ... but only if there are no errors. Somehow the fields gets repopulated by Spring when there are validation errors (FieldErrors or GlobalErrors). 回答1: So I have found a solution to the problem. It works very well but It seems a bit overkill for something as simple as clearing a field. Maybe a javascript snippet is a cleaner solution? Well

15 .css-浮动

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浮动浮动是css里面布局最多的一个属性，也是很重要的一个属性。 float：表示浮动的意思。它有四个值。 none: 表示不浮动，默认 left: 表示左浮动 right：表示右浮动看一个例子 html结构： <div class="box1"></div> <div class="box2"></div> <span>路飞学城</span> css样式： .box1{ width: 300px; height: 300px; background-color: red; float:left; } .box2{ width: 400px; height: 400px; background-color: green; float:right; } span{ float: left; width: 100px; height: 200px; background-color: yellow; } 我们会发现，三个元素并排显示，.box1和span因为是左浮动，紧挨在一起，这种现象贴边。.box2盒子因为右浮动，所以紧靠着右边。那么浮动如果大家想学好，一定要知道它的四大特性 1.浮动的元素脱标 2.浮动的元素互相贴靠 3.浮动的元素由"子围"效果 4.收缩的效果浮动元素脱标脱标：就是脱离了标准文档流看例子 <div class="box1">小红</div> <div

使div的高度随其内容而扩大

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我有这些嵌套的div，我需要主容器扩展（高度）以容纳内部的DIV  ...  <body class="main"> <div id="container"> <div id="header">  </div> <div id="main_content">  <div id="items_list" class="items_list ui-sortable"> <div id="item_35" class="item_details"> </div> <div id="item_36" class="item_details"> </div> <div id="item_37" class="item_details"> </div>  </div> </div> <br class=

【css】清除浮动（clearfix 和 clear）的用法

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本文主要是讲解如何在 html 中使用 clearfix 和 clear，针对那些刚开始了解 css 的童鞋。关于 clearfix 和 clear 的样式在这里我就不写了，具体样式点击此处。下面就谈谈对于这两个 class 的用法，首先我们先看个例子： <!DOCTYPE HTML> <html lang="en-US"> <head> <meta charset="UTF-8"/> <title>如何在html中使用clearfix和clear</title> <link rel="stylesheet" type="text/css" href="/css/base.css" media="all"/> <style type="text/css"> .fl{float:left;} .demo{background:#ccc;} .item1{background:#f90;height:100px;width:100px;} .item2{background:#fc0;height:200px;width:100px;} </style> </head> <body> <div class="demo"> <div class="fl item1"></div> <div class="fl item2"></div> </div> </body> </html>

Is there a way to clear your printed text in python?

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问题 I have wanted for a long time to find out how to clear something like print("example") in python, but I cant seem to find anyway or figure anything out. print("Hey") >Hey Now I need to clear it, and write some new text. print("How is your day?") It would print. Hey >How is your day? But I want to clear the "Hey" so the user shouldnt look at both at same time, and it looks kinda messy. 回答1: import os os.system('cls') Or os.system('clear') on unix (mac and linux). If you don't want the scroll

Clearing JTextfields to write multiple data to txt file

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问题 excuse the probably simple question (and the terrible layout methods). The code I have successfully writes inputted data to a txt file and on clicking "submit" closes the input window, leaving the "menu" open, with options to add a user (this code) or search properties (unrelated). I can enter one set of details to the txt file with no problem, but when reopening the AddUser window, no matter what is typed in to the boxes the same data is inputted into the file as the previous time, unless

Is it possible to override or clear the debug path in a dll build with new csproj project file?

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问题 When using dumpbin to view details on my library: dumpbin /headers Test.dll I see that {{FullFolder to Test.pdb}} is the full folder to the pdb. Debug Directories Time Type Size RVA Pointer -------- ------- -------- -------- -------- 95BA9373 cv A1 000199D4 17BD4 Format: RSDS, {4AF64893-BAF4-4FF3-9343-E8D5A55E94FF}, 1, {{FullFolder to Test.pdb}} 00000000 repro 0 00000000 0 Is there a way to exclude this in the csproj file ? My .csproj looks like: <DebugType>full</DebugType> <IncludeSource

利用CSS使footer固定在页面底部

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1.HTML基本结构 <!DOCTYPEhtml> <htmlxmlns="http://www.w3.org/1999/xhtml"> <headrunat="server"> <title>layout</title> </head> <body> <divclass="header"> <h1>head of your website.</h1> </div> <divclass="wrapper"> <divclass="content"> <h2>Your website content here.</h2> <scripttype="text/javascript"> for(var i = 0; i<100;i++){ document.write(i + "<br />"); } </script> </div> <divclass="clear"></div> </div> <divclass="footer"> <div><h1> Copyright (c) 2012</h1></div> </div> </body> </html> 2.CSS样式 <styletype="text/css"> *{ margin: 0;/* 把默认值都设为0 */ } html, body { height: 100%; width:85%;

how to define a reset button to clear all text field at one click? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . <ScrollView android:id="@+id/ScrollView1" android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true" > <LinearLayout android:id="@+id/MainParent" android:layout_width="wrap_content" android:layout_height="match_parent" > <LinearLayout android:layout_width="match_parent"