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<label class="md-nav__link md-nav__link--active" for="__toc"> <label class="md-nav__link md-nav__link--active" for="__toc">
3.1. &nbsp; 数据与内存 3.1. &nbsp; 数据与内存
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comments: true 3.1.1. &nbsp; 基本数据类型
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3.1. &nbsp; 3.1. &nbsp; 数据与内存
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3.1.1. &nbsp; 3.1.1. &nbsp; 基本数据类型
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3.1.2. &nbsp; 3.1.2. &nbsp; 计算机内存 3.1.2. &nbsp; 计算机内存
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<li class="md-nav__item"> <li class="md-nav__item">
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comments: true 3.1.1. &nbsp; 基本数据类型
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3.1. &nbsp; 3.1. &nbsp; 数据与内存
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3.1.1. &nbsp; 3.1.1. &nbsp; 基本数据类型
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3.1.2. &nbsp; 3.1.2. &nbsp; 计算机内存 3.1.2. &nbsp; 计算机内存
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<h1>3.1. &nbsp; 数据与内存</h1> <h1 id="31">3.1. &nbsp; 数据与内存<a class="headerlink" href="#31" title="Permanent link">&para;</a></h1>
<h2 id="311">3.1.1. &nbsp; 基本数据类型<a class="headerlink" href="#311" title="Permanent link">&para;</a></h2>
<hr />
<h2 id="comments-true">comments: true<a class="headerlink" href="#comments-true" title="Permanent link">&para;</a></h2>
<h1 id="31-31">3.1. &nbsp; 3.1. &nbsp; 数据与内存<a class="headerlink" href="#31-31" title="Permanent link">&para;</a></h1>
<h2 id="311-311">3.1.1. &nbsp; 3.1.1. &nbsp; 基本数据类型<a class="headerlink" href="#311-311" title="Permanent link">&para;</a></h2>
<p>谈到计算机中的数据我们能够想到文本、图片、视频、语音、3D 模型等等,这些数据虽然组织形式不同,但都是由各种基本数据类型构成的。</p> <p>谈到计算机中的数据我们能够想到文本、图片、视频、语音、3D 模型等等,这些数据虽然组织形式不同,但都是由各种基本数据类型构成的。</p>
<p><strong>「基本数据类型」是 CPU 可以直接进行运算的类型,在算法中直接被使用</strong></p> <p><strong>「基本数据类型」是 CPU 可以直接进行运算的类型,在算法中直接被使用</strong></p>
<ul> <ul>
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<p><img alt="IEEE 754 标准下的 float 表示方式" src="../data_and_memory.assets/ieee_754_float.png" /></p> <p><img alt="IEEE 754 标准下的 float 表示方式" src="../data_and_memory.assets/ieee_754_float.png" /></p>
<p align="center"> Fig. IEEE 754 标准下的 float 表示方式 </p> <p align="center"> Fig. IEEE 754 标准下的 float 表示方式 </p>
<p align="center"> Fig. IEEE 754 标准下的 float 表示方式 </p>
<p>以上图为例,<span class="arithmatex">\(\mathrm{S} = 0\)</span> <span class="arithmatex">\(\mathrm{E} = 124\)</span> <span class="arithmatex">\(\mathrm{N} = 2^{-2} + 2^{-3} = 0.375\)</span> ,易得</p> <p>以上图为例,<span class="arithmatex">\(\mathrm{S} = 0\)</span> <span class="arithmatex">\(\mathrm{E} = 124\)</span> <span class="arithmatex">\(\mathrm{N} = 2^{-2} + 2^{-3} = 0.375\)</span> ,易得</p>
<div class="arithmatex">\[ <div class="arithmatex">\[
\text { val } = (-1)^0 \times 2^{124 - 127} \times (1 + 0.375) = 0.171875 \text { val } = (-1)^0 \times 2^{124 - 127} \times (1 + 0.375) = 0.171875
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</div> </div>
</div> </div>
</div> </div>
<h2 id="312-312">3.1.2. &nbsp; 3.1.2. &nbsp; 计算机内存<a class="headerlink" href="#312-312" title="Permanent link">&para;</a></h2> <h2 id="312">3.1.2. &nbsp; 计算机内存<a class="headerlink" href="#312" title="Permanent link">&para;</a></h2>
<p>在计算机中,内存和硬盘是两种主要的存储硬件设备。「硬盘」主要用于长期存储数据,容量较大(通常可达到 TB 级别)、速度较慢。「内存」用于运行程序时暂存数据,速度较快,但容量较小(通常为 GB 级别)。</p> <p>在计算机中,内存和硬盘是两种主要的存储硬件设备。「硬盘」主要用于长期存储数据,容量较大(通常可达到 TB 级别)、速度较慢。「内存」用于运行程序时暂存数据,速度较快,但容量较小(通常为 GB 级别)。</p>
<p><strong>算法运行中,相关数据都被存储在内存中</strong>。下图展示了一个计算机内存条,其中每个黑色方块都包含一块内存空间。我们可以将内存想象成一个巨大的 Excel 表格,其中每个单元格都可以存储 1 byte 的数据,在算法运行时,所有数据都被存储在这些单元格中。</p> <p><strong>算法运行中,相关数据都被存储在内存中</strong>。下图展示了一个计算机内存条,其中每个黑色方块都包含一块内存空间。我们可以将内存想象成一个巨大的 Excel 表格,其中每个单元格都可以存储 1 byte 的数据,在算法运行时,所有数据都被存储在这些单元格中。</p>
<p><strong>系统通过「内存地址 Memory Location」来访问目标内存位置的数据</strong>。计算机根据特定规则给表格中每个单元格编号,保证每块内存空间都有独立的内存地址。自此,程序便通过这些地址,访问内存中的数据。</p> <p><strong>系统通过「内存地址 Memory Location」来访问目标内存位置的数据</strong>。计算机根据特定规则给表格中每个单元格编号,保证每块内存空间都有独立的内存地址。自此,程序便通过这些地址,访问内存中的数据。</p>
<p><img alt="内存条、内存空间、内存地址" src="../data_and_memory.assets/computer_memory_location.png" /></p> <p><img alt="内存条、内存空间、内存地址" src="../data_and_memory.assets/computer_memory_location.png" /></p>
<p align="center"> Fig. 内存条、内存空间、内存地址 </p> <p align="center"> Fig. 内存条、内存空间、内存地址 </p>
<p align="center"> Fig. 内存条、内存空间、内存地址 </p>
<p><strong>内存资源是设计数据结构与算法的重要考虑因素</strong>。内存是所有程序的公共资源,当内存被某程序占用时,不能被其它程序同时使用。我们需要根据剩余内存资源的情况来设计算法。例如,若剩余内存空间有限,则要求算法占用的峰值内存不能超过系统剩余内存;若运行的程序很多、缺少大块连续的内存空间,则要求选取的数据结构必须能够存储在离散的内存空间内。</p> <p><strong>内存资源是设计数据结构与算法的重要考虑因素</strong>。内存是所有程序的公共资源,当内存被某程序占用时,不能被其它程序同时使用。我们需要根据剩余内存资源的情况来设计算法。例如,若剩余内存空间有限,则要求算法占用的峰值内存不能超过系统剩余内存;若运行的程序很多、缺少大块连续的内存空间,则要求选取的数据结构必须能够存储在离散的内存空间内。</p>

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<url> <url>
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<url> <url>
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<url> <url>
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<url> <url>
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<changefreq>daily</changefreq> <changefreq>daily</changefreq>
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<url> <url>
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