【C++从入门到熟练练习题】002 C++数据类型及C++注释

目录

<a data-token="f91c349bccf475c80bd0b6a0f90d7e59" href="https://blog.csdn.net/shuiyixin/article/details/86653948#%E4%B8%80%E3%80%81%E5%89%8D%E8%A8%80" rel="nofollow">一、前言</a>

<a data-token="16eea65c76968970b6a0f47456f32002" href="https://blog.csdn.net/shuiyixin/article/details/86653948#1.%E4%B8%8A%E8%8A%82%E8%AF%BE%E5%9B%9E%E9%A1%BE" rel="nofollow">1.上节课回顾</a>

<a data-token="6cce8edef3c6d1e2872a88c6fd9308a2" href="https://blog.csdn.net/shuiyixin/article/details/86653948#2.%E4%B8%8A%E8%8A%82%E6%80%9D%E8%80%83%E9%A2%98%E7%AD%94%E6%A1%88" rel="nofollow">2.上节思考题答案</a>

<a data-token="53f8e1c1d26705f4686b93150427cd40" href="https://blog.csdn.net/shuiyixin/article/details/86653948#%E4%BA%8C%E3%80%81%E9%87%8D%E7%82%B9%E7%9F%A5%E8%AF%86%E4%BB%8B%E7%BB%8D" rel="nofollow">二、重点知识介绍</a>

<a data-token="af9ee4a25c12c6767d828ef742bb803c" href="https://blog.csdn.net/shuiyixin/article/details/86653948#2.%E5%85%B3%E4%BA%8E%20iostream%20%E5%92%8C%20iostream.h" rel="nofollow">1.关于变量</a>

<a data-token="4151c62480587bfb7185200f5ec4f13c" href="https://blog.csdn.net/shuiyixin/article/details/86653948#2.%E4%BF%AE%E9%A5%B0%E7%AC%A6" rel="nofollow">2.修饰符</a>

<a data-token="0c9a6642a00fc1120183bc9d9eac9751" href="https://blog.csdn.net/shuiyixin/article/details/86653948#3.typedef%20%E5%A3%B0%E6%98%8E" rel="nofollow">3.typedef 声明</a>

<a data-token="aec6e523a2d0aeb05f9acf1f0b363aac" href="https://blog.csdn.net/shuiyixin/article/details/86653948#%C2%A04.%E6%9E%9A%E4%B8%BE%E7%B1%BB%E5%9E%8B" rel="nofollow">4.枚举类型</a>

<a data-token="88fedbfc6fe8540cddcc99e5578ff84b" href="https://blog.csdn.net/shuiyixin/article/details/86653948#2.%E4%BB%A3%E7%A0%81%E7%9A%84%E6%8D%A2%E8%A1%8C" rel="nofollow">5.注释</a>

<p id="%E4%B8%89%E3%80%81%E4%BE%8B%E9%A2%98%EF%BC%9A%E5%AE%9A%E4%B9%89%E4%B8%A4%E4%B8%AA%E6%95%B4%E5%9E%8B%E5%8F%98%E9%87%8Fa%EF%BC%8Cb%EF%BC%8C%E5%B9%B6%E5%B0%86%E4%BB%96%E4%BB%AC%E8%BE%93%E5%87%BA%E3%80%82-toc" style="margin-left:40px;"><a data-token="dc88e0ab923751da74eb0d93f09002f5" href="https://blog.csdn.net/shuiyixin/article/details/86653948#%E4%B8%89%E3%80%81%E4%BE%8B%E9%A2%98%EF%BC%9A%E5%AE%9A%E4%B9%89%E4%B8%A4%E4%B8%AA%E6%95%B4%E5%9E%8B%E5%8F%98%E9%87%8Fa%EF%BC%8Cb%EF%BC%8C%E5%B9%B6%E5%B0%86%E4%BB%96%E4%BB%AC%E8%BE%93%E5%87%BA%E3%80%82" rel="nofollow">三、例题：</a>

<a data-token="0039f738a6a6cbda4548c4ff781262e7" href="https://blog.csdn.net/shuiyixin/article/details/86653948#1.%E4%BB%A3%E7%A0%81" rel="nofollow">1.代码</a>

<a data-token="4afb9cab7950e4abacf418a0c1b4f149" href="https://blog.csdn.net/shuiyixin/article/details/86653948#2.%E8%BF%90%E8%A1%8C%E7%BB%93%E6%9E%9C" rel="nofollow">2.运行结果</a>

<a data-token="6bbce3a7b896eb1422c44b92470ae0c2" href="https://blog.csdn.net/shuiyixin/article/details/86653948#%E5%9B%9B%E3%80%81%E6%80%9D%E8%80%83%E9%A2%98" rel="nofollow">四、思考题</a>

<hr id="hr-toc"><h2 id="%E4%B8%80%E3%80%81%E5%89%8D%E8%A8%80">一、前言</h2>

<h3 id="1.%E4%B8%8A%E8%8A%82%E8%AF%BE%E5%9B%9E%E9%A1%BE">1.上节课回顾</h3>

上一次给大家讲了C++常用变量的定义，后续的很多操作都需要我们先定义变量，然后对变量进行操作，上节课讲的变量类型是C++中最常用的类型，你也可以自己定义一个新的类型，后面讲到有关于结构体或者类的时候，大家就会有更深的理解。

本节课还是讲解有关于数据类型的知识，上节课讲解的主要是常用变量，当大家对常用变量理解的时候，大家再去学习数据类型就好理解多了，就像我们学数学，当我们理解了：1.2.3.4.5，我们就能更好的理解整数，从而能更好的理解小数，

<h3 id="2.%E4%B8%8A%E8%8A%82%E6%80%9D%E8%80%83%E9%A2%98%E7%AD%94%E6%A1%88">2.上节思考题答案</h3>

题目：定义一个单精度浮点型变量a（初值为 1.1），一个双精度浮点型变量b（初值为 2.2），将 a 和 b 输出。

<pre class="blockcode">
<code class="language-cpp">#include <iostream>
using namespace std;

int main()
{
 float a=1.1;
 double b=2.2;
 cout<<"a="<< a <<endl;
 cout<<"b="<</pre>

在这里要说一点就是，一个“；”占一行，虽