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Linux下printf函数不加换行符就不能输出相关的内容.html
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q-show="isShow"></div></nav><div id="wrapper" class="body-wrap"><div class="menu-l"><div class="canvas-wrap"><canvas data-colors="#eaeaea" data-sectionheight="100" data-contentid="js-content" id="myCanvas1" class="anm-canvas"></canvas></div><div id="js-content" class="content-ll"><article id="post-Linux下printf函数不加换行符就不能输出相关的内容" class="article article-type-post" itemscope itemprop="blogPost"><div class="article-inner"><header class="article-header"><h1 class="article-title" itemprop="name">Linux下printf函数不加\n就不能输出相关的内容</h1><span id="busuanzi_container_page_pv" style="display:none" class="archive-article-date"><i class="icon-smile icon"></i> 阅读数：<span id="busuanzi_value_page_pv"></span>次 </span><a href="/Linux%E4%B8%8Bprintf%E5%87%BD%E6%95%B0%E4%B8%8D%E5%8A%A0%E6%8D%A2%E8%A1%8C%E7%AC%A6%E5%B0%B1%E4%B8%8D%E8%83%BD%E8%BE%93%E5%87%BA%E7%9B%B8%E5%85%B3%E7%9A%84%E5%86%85%E5%AE%B9.html" class="archive-article-date"><time datetime="2021-01-11T06:30:09.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2021-01-11</time></a><div style="margin-top:10px"><span class="post-time"><span class="post-meta-item-icon"><i class="icon-statistics"></i> <span class="post-meta-item-text">字数统计:</span> <span class="post-count">474字</span> </span></span><span class="post-time"> | <span class="post-meta-item-icon"><i class="icon-book icon"></i> <span class="post-meta-item-text">阅读时长≈</span> <span class="post-count">2分</span></span></span></div></header><div class="article-entry" itemprop="articleBody"><p><strong>转载自：</strong><a href="https://blog.csdn.net/qq_26093511/article/details/53255970" target="_blank" rel="noopener">CSDN博主Alen.Wang</a> 地址：<a href="https://blog.csdn.net/qq_26093511/article/details/53255970" target="_blank" rel="noopener">https://blog.csdn.net/qq_26093511/article/details/53255970</a></p><p><strong>原因： 输出缓冲区的问题。</strong></p><p><code>unix</code>上标准输入输出都是带有缓存的，一般是行缓存。</p><p>对于标准输出，需要输出的数据并不是直接输出到终端上，而是首先缓存到某个地方，当遇到行刷新标志或者该缓存已满的情况下，才会把缓存的数据显示到终端设备上。</p><p><code>ANSI C</code>中定义换行符<code>\n</code>可以认为是行刷新标志。所以，<code>printf</code>函数没有带<code>\n</code>是不会自动刷新输出流，直至缓存被填满。</p><a id="more"></a><p>解决方案：</p><p>方案1、在<code>printf</code>里加<code>\n</code></p><p>方案2、在<code>printf</code>后面调用<code>fflush(stdout)</code>函数来刷新标准输出缓冲区，把输出缓冲区里的东西打印到标准输出设备上 。</p><p>方案3、使用<code>setvbuf(stdout,NULL,_IONBF,0);</code>函数来禁止缓冲区，这样就会直接进行输出。</p><p>这两个函数都是有关流缓冲区的. 具体使用和说明网上有很多. 我只说一下什么是流缓冲区, 是做什么用的。</p><p>操作系统为减少IO操作所以设置了缓冲区。等缓冲区满了再去操作IO，这样是为了提高效率。</p><p>下面是测试代码：</p><p>方案一、</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string"><stdio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string"><unistd.h></span></span></span><br><span class="line"> </span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> i;</span><br><span class="line"> <span class="keyword">for</span>(i=<span class="number">0</span>;i<<span class="number">10</span>;i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"\r %d%% is complete.\n"</span>,i);</span><br><span class="line"> sleep(<span class="number">1</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"\n"</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>方案二、</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string"><stdio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string"><unistd.h></span></span></span><br><span class="line"> </span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> i;</span><br><span class="line"> <span class="keyword">for</span>(i=<span class="number">0</span>;i<<span class="number">10</span>;i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"\r %d%% is complete."</span>,i);</span><br><span class="line"> fflush(<span class="built_in">stdout</span>);</span><br><span class="line"> sleep(<span class="number">1</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"\n"</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>方案三、</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string"><stdio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string"><unistd.h></span></span></span><br><span class="line"> </span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> i;</span><br><span class="line"> setvbuf(<span class="built_in">stdout</span>,<span class="literal">NULL</span>,_IONBF,<span class="number">0</span>); <span class="comment">//直接将缓冲区禁止了. 它就直接输出了</span></span><br><span class="line"> <span class="keyword">for</span>(i=<span class="number">0</span>;i<<span class="number">10</span>;i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"\r %d%% is complete."</span>,i);</span><br><span class="line"> sleep(<span class="number">1</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"\n"</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure><div class="declare"><ul class="post-copyright"><li><strong>本文作者：</strong> 路痴的兔子</li><li><strong>本文链接：</strong> <a href="https:/proudrabbit.gitee.io/Linux下printf函数不加换行符就不能输出相关的内容.html" title="Linux下printf函数不加\n就不能输出相关的内容" target="_blank">https:/proudrabbit.gitee.io/Linux下printf函数不加换行符就不能输出相关的内容.html</a></li><li><strong>版权声明： </strong>本博客所有文章除特别声明外，均采用 <a href="https://github.com/JoeyBling/hexo-theme-yilia-plus/blob/master/LICENSE" rel="external nofollow" target="_blank">MIT</a> 许可协议。转载请注明出处！</li></ul></div></div><div class="article-info article-info-index"><div class="article-tag tagcloud"><i class="icon-price-tags icon"></i><ul class="article-tag-list"><li class="article-tag-list-item"><a href="javascript:void(0)" class="js-tag article-tag-list-link color3">随笔</a></li><li class="article-tag-list-item"><a href="javascript:void(0)" class="js-tag article-tag-list-link color1">Linux</a></li></ul></div><div class="share-btn 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n)return t.insertAdjacentHTML("afterend",n);var r=t.nextSibling;return r?t.parentNode.insertBefore(n,r):t.parentNode.appendChild(n)}}])</script><script src="/./main.b8fa34.js"></script><script>!function(){var e=document.createElement("script");document.getElementsByTagName("body")[0].appendChild(e),e.setAttribute("src","/slider.b6a41a.js")}()</script><div class="tools-col" q-class="show:isShow,hide:isShow|isFalse" q-on="click:stop(e)"><div class="tools-nav header-menu"><ul style="width:70%"><li style="width:33.333333333333336%" q-on="click: openSlider(e, 'innerArchive')"><a href="javascript:void(0)" q-class="active:innerArchive">所有文章</a></li><li style="width:33.333333333333336%" q-on="click: openSlider(e, 'friends')"><a href="javascript:void(0)" q-class="active:friends">友情链接</a></li><li style="width:33.333333333333336%" q-on="click: openSlider(e, 'aboutme')"><a href="javascript:void(0)" q-class="active:aboutme">关于我</a></li></ul></div><div class="tools-wrap"><section 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jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre></p><li class="search-li" q-repeat="items" q-show="isShow"><a q-attr="href:path|urlformat" class="search-title"><i class="icon-quo-left icon"></i><span q-text="title"></span></a><p class="search-time"><i class="icon-calendar icon"></i> <span q-text="date|dateformat"></span></p><p class="search-tag"><i class="icon-price-tags icon"></i> <span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span></p></li></ul></section><section class="tools-section tools-section-friends" q-show="friends"><ul class="search-ul"><li class="search-li"><a href="https://blog.csdn.net/qq_37000789" target="_blank" class="search-title" title="个人博客"><i class="icon-link icon"></i> 正月点灯笼的博客</a></li><li class="search-li"><a href="https://blog.csdn.net/ld1461575230?spm=1001.2101.3001.5343&type=blog" target="_blank" class="search-title" title="个人博客"><i class="icon-link icon"></i> 哈哈哈的嘎嘎嘎的博客</a></li><li class="search-li"><a href="https://gujiakai.gitee.io/" target="_blank" class="search-title" title="个人博客"><i class="icon-link icon"></i> 摸鱼的小灰栗的博客</a></li></ul></section><section class="tools-section tools-section-me" q-show="aboutme"><div class="aboutme-wrap" id="aboutme">熟悉的技术：<br>C/C++、Python、嵌入式、ROS。<br>开源爱好者、Linux爱好者。<br>欢迎访问我的博客。hi✿(。◕ᴗ◕。)✿</div></section></div></div><div class="pswp" tabindex="-1" role="dialog" aria-hidden="true"><div class="pswp__bg"></div><div class="pswp__scroll-wrap"><div class="pswp__container"><div class="pswp__item"></div><div class="pswp__item"></div><div class="pswp__item"></div></div><div class="pswp__ui pswp__ui--hidden"><div class="pswp__top-bar"><div class="pswp__counter"></div><button class="pswp__button pswp__button--close" title="Close (Esc)"></button> <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button> <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button> <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button><div class="pswp__preloader"><div class="pswp__preloader__icn"><div class="pswp__preloader__cut"><div class="pswp__preloader__donut"></div></div></div></div></div><div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap"><div class="pswp__share-tooltip"></div></div><button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)"></button> <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)"></button><div class="pswp__caption"><div class="pswp__caption__center"></div></div></div></div></div></div><script type="text/javascript" src="/plugins/TweenMax/TweenMax.min.js"></script><script type="text/javascript" src="/plugins/TweenMax/HoverImg.js"></script><script>var hoverEffect = {
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