《c++ primer》读书笔记1

我爱北京天安门

天安门上太阳升

伟大领袖毛主席

指引我们向前进

<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">笔记的范围：第一篇的引言和</span><span lang="EN" style="FONT-SIZE: 15pt">1.1</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">节</span><span lang="EN" style="FONT-SIZE: 15pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN" style="FONT-SIZE: 15pt"><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因为以前的读书习惯，我对这本书的开头抱着一种轻视的态度。自以为是的认为那不过是类似开场白那样的成篇废话。事实证明我错了。在不到四页的内容里。作者就一点不给面子的指出了我在读这本书之前的几个错误观点、</span><span lang="EN" style="FONT-SIZE: 15pt"><o:p></o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第一：对</span><span lang="EN" style="FONT-SIZE: 15pt">oop</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的理解，这里我不得不指出在国内大部分本科教材中把封装性作为</span><span lang="EN" style="FONT-SIZE: 15pt">oop</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的独有的特点之一、以至于让很多人</span><span lang="EN" style="FONT-SIZE: 15pt">(</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">包括我</span><span lang="EN" style="FONT-SIZE: 15pt">)</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">认为写了个</span><span lang="EN" style="FONT-SIZE: 15pt">class</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">就进入了</span><span lang="EN" style="FONT-SIZE: 15pt">oop</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的大门，这本书就明确的指出数据的封装只是对象的特点。是</span><span lang="EN" style="FONT-SIZE: 15pt">ADT</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的结果，设计方法的划分中属于基于对象（</span><span lang="EN" style="FONT-SIZE: 15pt">object based</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">），没有</span><span lang="EN" style="FONT-SIZE: 15pt">inheritance</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">机制和</span><span lang="EN" style="FONT-SIZE: 15pt">dynamic binding</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（动态绑定）的扩展就根本谈不上</span><span lang="EN" style="FONT-SIZE: 15pt">oop</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</span><span lang="EN" style="FONT-SIZE: 15pt"><o:p></o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第二：对</span><span lang="EN" style="FONT-SIZE: 15pt">c++</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的认识。作者明确指出</span><span lang="EN" style="FONT-SIZE: 15pt">c++</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是一种多种设计方法集于一体的语言。而我们更多的是把他作为一种</span><span lang="EN" style="FONT-SIZE: 15pt">oop</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的语言来学习，把</span><span lang="EN" style="FONT-SIZE: 15pt">c++</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">理解为带类的</span><span lang="EN" style="FONT-SIZE: 15pt">c</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，个人认为这种错误的观点导致的一个严重的问题是，我们带着</span><span lang="EN" style="FONT-SIZE: 15pt">c</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的思想来学习</span><span lang="EN" style="FONT-SIZE: 15pt">c++</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，使得我们在应用过程中用的是</span><span lang="EN" style="FONT-SIZE: 15pt">c++</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">东西。比如</span><span lang="EN" style="FONT-SIZE: 15pt">class</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</span><span lang="EN" style="FONT-SIZE: 15pt">I/o</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">流，但是我们思想还是</span><span lang="EN" style="FONT-SIZE: 15pt">c</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的，这使得我们难以接受</span><span lang="EN" style="FONT-SIZE: 15pt">oop</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以及其他设计方法；这使得我对认为学习</span><span lang="EN" style="FONT-SIZE: 15pt">c++</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，未必要学</span><span lang="EN" style="FONT-SIZE: 15pt">c</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的这种观点的真理性更深信不疑、</span><span lang="EN" style="FONT-SIZE: 15pt"><o:p></o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第三：对编程习惯的认识。在</span><span lang="EN" style="FONT-SIZE: 15pt">1.1</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">节中作者提出了一个问题。而不是像很多教材千篇一律的以“</span><span lang="EN" style="FONT-SIZE: 15pt">hello world</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”开头。其实，我一直反对学习一种语言一上来就动手的习惯、正如这本书那样，从思维入手，对于任何问题都以一个工程的态度去面对，在这里作者提出了分而治之和独步求精的思想。对于一个还没养成坏习惯的初学者来说，这好处实在不可估量。</span><span lang="EN" style="FONT-SIZE: 15pt"> <span style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp; </span>.<o:p></o:p></span></p> <p>&nbsp;</p>