class="tags" href="/C.html" title=c>content_views" class="tags" href="/C.html" title=c>class="markdown_views prism-tomorrow-night">

---

class="tags" href="/C.html" title=c>c="https://i-blog.class="tags" href="/C.html" title=c>csdnimg.class="tags" href="/C.html" title=c>cn/direclass="tags" href="/C.html" title=c>ct/class="tags" href="/C.html" title=c>cb7f73class="tags" href="/C.html" title=c>cda1a14130840e356class="tags" href="/C.html" title=c>cb0b6f9e4.png#piclass="tags" href="/C.html" title=c>c_class="tags" href="/C.html" title=c>center" alt="在这里插入图片描述" width="100" />

<class="tags" href="/C.html" title=c>center> 博客主页： [小ᶻ☡꙳ᵃⁱᵍᶜ꙳] class="tags" href="/C.html" title=c>center> <class="tags" href="/C.html" title=c>center> 本文专栏: C++ class="tags" href="/C.html" title=c>center>

---

---

class="tags" href="/C.html" title=c>c="https://img-blog.class="tags" href="/C.html" title=c>csdnimg.class="tags" href="/C.html" title=c>cn/direclass="tags" href="/C.html" title=c>ct/00d4fdeb7b0d4dbb99e88f325ef249d8.gif#piclass="tags" href="/C.html" title=c>c_class="tags" href="/C.html" title=c>center" alt="在这里插入图片描述" width="1000" height="100" />

---

💯前言

• 在编程学习过程中࿰class="tags" href="/C.html" title=c>c;C++ 语言为我们提供了强大的控制能力和灵活的操作方式。在本次学习中࿰class="tags" href="/C.html" title=c>c;我们面对的是一个简单的算术口算题目的处理任务。任务要求通过程序自动处理多个口算算式࿰class="tags" href="/C.html" title=c>c;输出完整的算式、其计算结果࿰class="tags" href="/C.html" title=c>c;并计算算式的总长度。这个问题看似简单࿰class="tags" href="/C.html" title=c>c;但可以通过多种方式解决࿰class="tags" href="/C.html" title=c>c;过程中涉及到字符串拼接、运算符判断和数据存储等基础编程技术。
  在本次讨论中࿰class="tags" href="/C.html" title=c>c;我们将深入分析两种不同的解决方法：我提出的做法与老师的做法。我们将详细对比这两种方法的思路、代码实现࿰class="tags" href="/C.html" title=c>c;并进行优化和拓展࿰class="tags" href="/C.html" title=c>c;以便对 C++ 编程的理解更为深刻。
  C++ 参考手册
  class="tags" href="/C.html" title=c>c="https://i-blog.class="tags" href="/C.html" title=c>csdnimg.class="tags" href="/C.html" title=c>cn/direclass="tags" href="/C.html" title=c>ct/f0db7class="tags" href="/C.html" title=c>c348331440fa266b3class="tags" href="/C.html" title=c>c24f558694.png#piclass="tags" href="/C.html" title=c>c_class="tags" href="/C.html" title=c>center" alt="在这里插入图片描述" />

---

💯题目描述

P1957 口算练习题
class="tags" href="/C.html" title=c>c="https://i-blog.class="tags" href="/C.html" title=c>csdnimg.class="tags" href="/C.html" title=c>cn/direclass="tags" href="/C.html" title=c>ct/053b74199class="tags" href="/C.html" title=c>c3class="tags" href="/C.html" title=c>c447791f307f6835f8ba6.png" alt="在这里插入图片描述" />

题目要求我们处理一组口算题目࿰class="tags" href="/C.html" title=c>c;每道题目可能包括加法、减法或乘法操作。每道题的输入由两个或三个数据组成࿰class="tags" href="/C.html" title=c>c;若有三个数据࿰class="tags" href="/C.html" title=c>c;第一个表示运算符（<class="tags" href="/C.html" title=c>code>aclass="tags" href="/C.html" title=c>code> 表示加法࿰class="tags" href="/C.html" title=c>c;<class="tags" href="/C.html" title=c>code>bclass="tags" href="/C.html" title=c>code> 表示减法࿰class="tags" href="/C.html" title=c>c;<class="tags" href="/C.html" title=c>code>class="tags" href="/C.html" title=c>cclass="tags" href="/C.html" title=c>code> 表示乘法）࿰class="tags" href="/C.html" title=c>c;接下来的两个数据为参与运算的数值；若只有两个数据࿰class="tags" href="/C.html" title=c>c;则表示继承上一道题的运算符。

我们需要输出每道题的完整算式࿰class="tags" href="/C.html" title=c>c;并且输出算式的总长度。以下是题目的完整描述：

输入格式：

<class="tags" href="/C.html" title=c>code>4
a 64 46
275 125
class="tags" href="/C.html" title=c>c 11 99
b 46 64
class="tags" href="/C.html" title=c>code>

输出格式：

<class="tags" href="/C.html" title=c>code>64+46=110
9
275+125=400
11
11*99=1089
10
46-64=-18
9
class="tags" href="/C.html" title=c>code>

💯我的做法

我的实现方法着眼于输入的处理与字符串的拼接࿰class="tags" href="/C.html" title=c>c;基本流程如下：

1. 输入读取：首先读取题目数量 <class="tags" href="/C.html" title=c>code>iclass="tags" href="/C.html" title=c>code>࿰class="tags" href="/C.html" title=c>c;然后循环处理每一道算式。每道算式可以是完整的带有运算符的输入࿰class="tags" href="/C.html" title=c>c;也可以是继承上题的运算符。
2. 算式计算：对于每道算式࿰class="tags" href="/C.html" title=c>c;根据运算符 <class="tags" href="/C.html" title=c>code>aclass="tags" href="/C.html" title=c>code>, <class="tags" href="/C.html" title=c>code>bclass="tags" href="/C.html" title=c>code>, 或 <class="tags" href="/C.html" title=c>code>class="tags" href="/C.html" title=c>cclass="tags" href="/C.html" title=c>code> 来决定进行加法、减法或乘法操作。
3. 字符串拼接：利用字符串的拼接（<class="tags" href="/C.html" title=c>code>+=class="tags" href="/C.html" title=c>code>）来构造完整的算式表达式࿰class="tags" href="/C.html" title=c>c;并计算结果。
4. 输出：输出每道算式及其结果࿰class="tags" href="/C.html" title=c>c;最后输出算式的总长度。

代码实现：

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class="tags" href="/C.html" title=c>class="token maclass="tags" href="/C.html" title=c>cro property">class="tags" href="/C.html" title=c>class="token direclass="tags" href="/C.html" title=c>ctive-hash">#class="tags" href="/C.html" title=c>class="token direclass="tags" href="/C.html" title=c>ctive keyword">inclass="tags" href="/C.html" title=c>clude class="tags" href="/C.html" title=c>class="token string"><string>
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title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">elseclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{a class="tags" href="/C.html" title=c>class="token operator">= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">stoiclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(tempclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>cin class="tags" href="/C.html" title=c>class="token operator">>> bclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">ifclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(ysf class="tags" href="/C.html" title=c>class="token operator">== class="tags" href="/C.html" title=c>class="token string">"a"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(aclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token class="tags" href="/C.html" title=c>char">'+'class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(bclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token class="tags" href="/C.html" title=c>char">'='class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(a class="tags" href="/C.html" title=c>class="token operator">+ bclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">else class="tags" href="/C.html" title=c>class="token keyword">ifclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(ysf class="tags" href="/C.html" title=c>class="token operator">== class="tags" href="/C.html" title=c>class="token string">"b"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(aclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token class="tags" href="/C.html" title=c>char">'-'class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(bclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token class="tags" href="/C.html" title=c>char">'='class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(a class="tags" href="/C.html" title=c>class="token operator">- bclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">elseclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(aclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token class="tags" href="/C.html" title=c>char">'*'class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(bclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token class="tags" href="/C.html" title=c>char">'='class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;s class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(a class="tags" href="/C.html" title=c>class="token operator">* bclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>cout class="tags" href="/C.html" title=c>class="token operator"><< s class="tags" href="/C.html" title=c>class="token operator"><< endlclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>cout class="tags" href="/C.html" title=c>class="token operator"><< sclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">.class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">sizeclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">) class="tags" href="/C.html" title=c>class="token operator"><< endlclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">return class="tags" href="/C.html" title=c>class="token number">0class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;
class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}
class="tags" href="/C.html" title=c>code>

💯老师的做法

老师的做法与我的实现思路相似࿰class="tags" href="/C.html" title=c>c;但有一些不同之处。老师的代码在结构上稍显复杂࿰class="tags" href="/C.html" title=c>c;特别是在输入和字符串拼接部分的处理上࿰class="tags" href="/C.html" title=c>c;且做了更多的优化来处理继承运算符的情况。

代码实现：

<class="tags" href="/C.html" title=c>code class="tags" href="/C.html" title=c>class="prism language-class="tags" href="/C.html" title=c>cpp">class="tags" href="/C.html" title=c>class="token keyword">int class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">mainclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)
class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{class="tags" href="/C.html" title=c>class="token keyword">int n class="tags" href="/C.html" title=c>class="token operator">= class="tags" href="/C.html" title=c>class="token number">0class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>cin class="tags" href="/C.html" title=c>class="token operator">>> nclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;string opclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;string num1class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;string num2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;string lastclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">int ret class="tags" href="/C.html" title=c>class="token operator">= class="tags" href="/C.html" title=c>class="token number">0class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">while class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(nclass="tags" href="/C.html" title=c>class="token operator">--class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{string ansclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>cin class="tags" href="/C.html" title=c>class="token operator">>> opclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">if class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(op class="tags" href="/C.html" title=c>class="token operator">== class="tags" href="/C.html" title=c>class="token string">"a" class="tags" href="/C.html" title=c>class="token operator">|| op class="tags" href="/C.html" title=c>class="token operator">== class="tags" href="/C.html" title=c>class="token string">"b" class="tags" href="/C.html" title=c>class="token operator">|| op class="tags" href="/C.html" title=c>class="token operator">== class="tags" href="/C.html" title=c>class="token string">"class="tags" href="/C.html" title=c>c"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{class="tags" href="/C.html" title=c>cin class="tags" href="/C.html" title=c>class="token operator">>> num1 class="tags" href="/C.html" title=c>class="token operator">>> num2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">int n1 class="tags" href="/C.html" title=c>class="token operator">= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">stoiclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(num1class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">int n2 class="tags" href="/C.html" title=c>class="token operator">= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">stoiclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(num2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;ans class="tags" href="/C.html" title=c>class="token operator">+= num1class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">if class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(op class="tags" href="/C.html" title=c>class="token operator">== class="tags" href="/C.html" title=c>class="token string">"a"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{ret class="tags" href="/C.html" title=c>class="token operator">= n1 class="tags" href="/C.html" title=c>class="token operator">+ n2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;ans class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token string">"+"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">else class="tags" href="/C.html" title=c>class="token keyword">if class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(op class="tags" href="/C.html" title=c>class="token operator">== class="tags" href="/C.html" title=c>class="token string">"b"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{ret class="tags" href="/C.html" title=c>class="token operator">= n1 class="tags" href="/C.html" title=c>class="token operator">- n2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;ans class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token string">"-"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">elseclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{ret class="tags" href="/C.html" title=c>class="token operator">= n1 class="tags" href="/C.html" title=c>class="token operator">* n2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;ans class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token string">"*"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}last class="tags" href="/C.html" title=c>class="token operator">= opclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">elseclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{num1 class="tags" href="/C.html" title=c>class="token operator">= opclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>cin class="tags" href="/C.html" title=c>class="token operator">>> num2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">int n1 class="tags" href="/C.html" title=c>class="token operator">= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">stoiclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(num1class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">int n2 class="tags" href="/C.html" title=c>class="token operator">= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">stoiclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(num2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;ans class="tags" href="/C.html" title=c>class="token operator">+= num1class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token keyword">if class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(last class="tags" href="/C.html" title=c>class="token operator">== class="tags" href="/C.html" title=c>class="token string">"a"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{ret class="tags" href="/C.html" title=c>class="token operator">= n1 class="tags" href="/C.html" title=c>class="token operator">+ n2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;ans class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token string">"+"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">else class="tags" href="/C.html" title=c>class="token keyword">if class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(last class="tags" href="/C.html" title=c>class="token operator">== class="tags" href="/C.html" title=c>class="token string">"b"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{ret class="tags" href="/C.html" title=c>class="token operator">= n1 class="tags" href="/C.html" title=c>class="token operator">- n2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;ans class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token string">"-"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">elseclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">{ret class="tags" href="/C.html" title=c>class="token operator">= n1 class="tags" href="/C.html" title=c>class="token operator">* n2class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;ans class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token string">"*"class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}ans class="tags" href="/C.html" title=c>class="token operator">+= class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(num2 class="tags" href="/C.html" title=c>class="token operator">+ class="tags" href="/C.html" title=c>class="token string">"=" class="tags" href="/C.html" title=c>class="token operator">+ class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">to_stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(retclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>cout class="tags" href="/C.html" title=c>class="token operator"><< ans class="tags" href="/C.html" title=c>class="token operator"><< endlclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>cout class="tags" href="/C.html" title=c>class="token operator"><< ansclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">.class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">sizeclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">) class="tags" href="/C.html" title=c>class="token operator"><< endlclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}class="tags" href="/C.html" title=c>class="token keyword">return class="tags" href="/C.html" title=c>class="token number">0class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">;
class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">}
class="tags" href="/C.html" title=c>code>

💯对比分析

1. 结构差异：

   • 我的做法中࿰class="tags" href="/C.html" title=c>c;我们根据输入的运算符判断是否更新运算符࿰class="tags" href="/C.html" title=c>c;并且用 <class="tags" href="/C.html" title=c>code>last_opclass="tags" href="/C.html" title=c>code> 来记住上一题的运算符࿰class="tags" href="/C.html" title=c>c;保证后续算式的正确计算。
   • 老师的做法稍微复杂一些࿰class="tags" href="/C.html" title=c>c;采用了更显式的变量存储（如 <class="tags" href="/C.html" title=c>code>lastclass="tags" href="/C.html" title=c>code> 变量）。另外࿰class="tags" href="/C.html" title=c>c;老师在每次处理完一个算式后࿰class="tags" href="/C.html" title=c>c;拼接完成的字符串才会输出。

2. 字符串拼接：

   • 我的做法通过直接将 <class="tags" href="/C.html" title=c>code>+class="tags" href="/C.html" title=c>code>、<class="tags" href="/C.html" title=c>code>-class="tags" href="/C.html" title=c>code>、<class="tags" href="/C.html" title=c>code>*class="tags" href="/C.html" title=c>code> 等运算符拼接进 <class="tags" href="/C.html" title=c>code>ansclass="tags" href="/C.html" title=c>code> 字符串。
   • 老师的做法在拼接过程中࿰class="tags" href="/C.html" title=c>c;将运算符的插入和结果的转换更加细化࿰class="tags" href="/C.html" title=c>c;也做了更精确的类型转换处理（使用 <class="tags" href="/C.html" title=c>code>stoiclass="tags" href="/C.html" title=c>code> 将字符串转换为整数）。

3. 处理继承运算符：

   • 我的做法是依赖 <class="tags" href="/C.html" title=c>code>last_opclass="tags" href="/C.html" title=c>code> 来判断是否使用上一题的运算符。
   • 老师的做法在这一点上比较细致࿰class="tags" href="/C.html" title=c>c;利用了 <class="tags" href="/C.html" title=c>code>lastclass="tags" href="/C.html" title=c>code> 变量来确保后续运算使用的是正确的运算符。

💯拓展与优化

1. 代码优化：

   • 对于运算符和结果拼接部分࿰class="tags" href="/C.html" title=c>c;使用了 <class="tags" href="/C.html" title=c>code>+=class="tags" href="/C.html" title=c>code> 拼接字符串࿰class="tags" href="/C.html" title=c>c;但如果问题较为复杂或涉及到更多操作࿰class="tags" href="/C.html" title=c>c;可能会导致拼接效率不高。可以考虑使用 <class="tags" href="/C.html" title=c>code>ostringstreamclass="tags" href="/C.html" title=c>code> 来拼接字符串࿰class="tags" href="/C.html" title=c>c;这样可以提高性能。

2. 用户输入优化：

   • 可以增加输入校验࿰class="tags" href="/C.html" title=c>c;避免用户输入错误的数据类型（如非数字输入等）。

3. 更广泛的应用：

   • 这类算术问题不仅限于加法、减法和乘法。如果要处理更多运算符（如除法、取余等）࿰class="tags" href="/C.html" title=c>c;可以通过扩展运算符判断来完成。

4. 函数化：

   • 该问题的不同部分（如运算符判断、算式拼接、输出结果等）可以通过函数化进行封装࿰class="tags" href="/C.html" title=c>c;提高代码的模块化和复用性。

💯总结

本次学习和讨论了如何用 C++ 语言处理简单的口算算式࿰class="tags" href="/C.html" title=c>c;通过两种不同的实现方法（我的做法与老师的做法）࿰class="tags" href="/C.html" title=c>c;我们掌握了如何判断运算符、处理继承运算符的情况࿰class="tags" href="/C.html" title=c>c;并输出结果与算式的总长度。通过对比分析࿰class="tags" href="/C.html" title=c>c;我们看到了两种做法的异同与各自的优缺点。

在优化方面࿰class="tags" href="/C.html" title=c>c;我们提出了改进的思路࿰class="tags" href="/C.html" title=c>c;如何提高代码性能、增强可扩展性࿰class="tags" href="/C.html" title=c>c;以及如何处理更多复杂的运算符类型。总体来说࿰class="tags" href="/C.html" title=c>c;这道题目的解决方案为我们提供了一个很好的编程练习机会࿰class="tags" href="/C.html" title=c>c;帮助我们更好地理解字符串操作、控制流程和输入输出的细节。

一开始的错误做法

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title=c>class="token keyword">elsea class="tags" href="/C.html" title=c>class="token operator">= class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">stoiclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(class="tags" href="/C.html" title=c>class="token funclass="tags" href="/C.html" title=c>ction">stringclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">(class="tags" href="/C.html" title=c>class="token number">1class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">, sclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">[iclass="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">]class="tags" href="/C.html" title=c>class="token punclass="tags" href="/C.html" title=c>ctuation">)class="tags" href="/C.html" title=c>class="token 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还有࿰class="tags" href="/C.html" title=c>c;要注意变量的作用域

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学习C++的建议

C++ 是一门强大且广泛应用的编程语言࿰class="tags" href="/C.html" title=c>c;无论是系统开发、游戏开发还是高性能计算࿰class="tags" href="/C.html" title=c>c;它都有不可替代的地位。然而࿰class="tags" href="/C.html" title=c>c;学习C++的道路可能是陡峭的࿰class="tags" href="/C.html" title=c>c;为了帮助你更高效地掌握这门语言࿰class="tags" href="/C.html" title=c>c;我总结了一些学习建议和经验。

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1. 理解C++的基础
学习重点：

1. 掌握基本语法：
   • 学会声明变量、条件语句、循环、函数等核心语法。
   • 掌握数组、指针、引用等基础知识。
2. 熟悉标准输入输出：
   • 掌握 <class="tags" href="/C.html" title=c>code>class="tags" href="/C.html" title=c>cinclass="tags" href="/C.html" title=c>code> 和 <class="tags" href="/C.html" title=c>code>class="tags" href="/C.html" title=c>coutclass="tags" href="/C.html" title=c>code> 的用法。
   • 理解格式化输出࿰class="tags" href="/C.html" title=c>c;例如 <class="tags" href="/C.html" title=c>code>std::setwclass="tags" href="/C.html" title=c>code> 和 <class="tags" href="/C.html" title=c>code>std::fixedclass="tags" href="/C.html" title=c>code>。
3. 记住编译器的角色：
   • 理解源代码如何通过编译器转换为可执行程序࿰class="tags" href="/C.html" title=c>c;选择一款好的IDE（如Visual Studio、Clion、VSCode）。

class="tags" href="/C.html" title=c>ckquote>

建议：用大量小程序练习这些基础语法࿰class="tags" href="/C.html" title=c>c;比如写一个计算器、模拟猜数字游戏等。

class="tags" href="/C.html" title=c>ckquote>

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2. 深入学习C++的特性
学习重点：

1. 面向对象编程（OOP）：
   • 理解类和对象࿰class="tags" href="/C.html" title=c>c;熟悉如何定义类、成员变量和成员函数。
   • 掌握封装、继承、多态三大核心特性。
2. 内存管理：
   • 理解指针的用法࿰class="tags" href="/C.html" title=c>c;掌握动态内存分配（<class="tags" href="/C.html" title=c>code>newclass="tags" href="/C.html" title=c>code> 和 <class="tags" href="/C.html" title=c>code>deleteclass="tags" href="/C.html" title=c>code>）。
   • 学习如何避免内存泄漏࿰class="tags" href="/C.html" title=c>c;熟悉智能指针（如<class="tags" href="/C.html" title=c>code>std::unique_ptrclass="tags" href="/C.html" title=c>code> 和 <class="tags" href="/C.html" title=c>code>std::shared_ptrclass="tags" href="/C.html" title=c>code>）。
3. 标准模板库（STL）：
   • 熟悉常用的容器（如<class="tags" href="/C.html" title=c>code>veclass="tags" href="/C.html" title=c>ctorclass="tags" href="/C.html" title=c>code>、<class="tags" href="/C.html" title=c>code>mapclass="tags" href="/C.html" title=c>code>、<class="tags" href="/C.html" title=c>code>setclass="tags" href="/C.html" title=c>code>）和算法（如<class="tags" href="/C.html" title=c>code>sortclass="tags" href="/C.html" title=c>code>、<class="tags" href="/C.html" title=c>code>findclass="tags" href="/C.html" title=c>code>）。
   • 掌握迭代器的用法。
4. 异常处理：
   • 学习使用<class="tags" href="/C.html" title=c>code>try-class="tags" href="/C.html" title=c>catclass="tags" href="/C.html" title=c>chclass="tags" href="/C.html" title=c>code>块处理异常。
   • 理解异常的用途以及如何设计健壮的代码。

class="tags" href="/C.html" title=c>ckquote>

建议：尝试开发一个小型项目࿰class="tags" href="/C.html" title=c>c;比如一个学生管理系统࿰class="tags" href="/C.html" title=c>c;综合应用类、STL、指针和动态内存分配。

class="tags" href="/C.html" title=c>ckquote>

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3. 掌握进阶内容
学习重点：

1. 模板：
   • 理解函数模板和类模板࿰class="tags" href="/C.html" title=c>c;掌握泛型编程思想。
   • 学习模板特化和模板元编程的基本概念。
2. 多线程与并发：
   • 学习 C++11 提供的多线程支持（如<class="tags" href="/C.html" title=c>code>std::threadclass="tags" href="/C.html" title=c>code>）。
   • 熟悉互斥锁（<class="tags" href="/C.html" title=c>code>std::mutexclass="tags" href="/C.html" title=c>code>）和条件变量（<class="tags" href="/C.html" title=c>code>std::class="tags" href="/C.html" title=c>condition_variableclass="tags" href="/C.html" title=c>code>）。
3. C++与C的兼容性：
   • 学习如何在C++中使用C语言代码࿰class="tags" href="/C.html" title=c>c;理解C和C++的区别。
   • 掌握C风格字符串（<class="tags" href="/C.html" title=c>code>class="tags" href="/C.html" title=c>char[]class="tags" href="/C.html" title=c>code>）和C++字符串（<class="tags" href="/C.html" title=c>code>std::stringclass="tags" href="/C.html" title=c>code>）的转换。

class="tags" href="/C.html" title=c>ckquote>

建议：在这一阶段࿰class="tags" href="/C.html" title=c>c;可以挑战更复杂的项目࿰class="tags" href="/C.html" title=c>c;比如开发一个小型的HTTP服务器࿰class="tags" href="/C.html" title=c>c;学习网络编程并结合多线程。

class="tags" href="/C.html" title=c>ckquote>

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4. 学习资源与实践方法
学习资源：

1. 书籍：
   • 《C++ Primer》：非常适合初学者的经典书籍。
   • 《Effeclass="tags" href="/C.html" title=c>ctive C++》：进阶学习C++最佳实践的指南。
   • 《The C++ Programming Language》：Bjarne Stroustrup（C++之父）的权威著作。
2. 在线课程：
   • Coursera 上的 C++ 编程课程。
   • YouTube 上免费的 C++ 系列教程。
3. 社区与文档：
   • 参与C++相关的论坛（如CSDN、Staclass="tags" href="/C.html" title=c>ck Overflow）。
   • 阅读官方文档（https://en.class="tags" href="/C.html" title=c>cppreferenclass="tags" href="/C.html" title=c>ce.class="tags" href="/C.html" title=c>com）。

实践方法：

1. 多写代码࿰class="tags" href="/C.html" title=c>c;多调试：
   • 每学一个概念后࿰class="tags" href="/C.html" title=c>c;写至少两个示例代码并进行调试。
2. 做小项目：
   • 从简单的控制台程序开始࿰class="tags" href="/C.html" title=c>c;比如文件读写、计算器、小游戏等。
   • 慢慢过渡到图形界面或网络程序开发。
3. 阅读他人代码：
   • 阅读开源项目的代码࿰class="tags" href="/C.html" title=c>c;理解优秀代码的设计思路。
4. 参加编程比赛：
   • 比如 LeetCode 或 Codeforclass="tags" href="/C.html" title=c>ces࿰class="tags" href="/C.html" title=c>c;可以帮助你提升算法能力和C++的熟练度。

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5. 保持耐心与兴趣
学习C++可能会面临以下困难：

1. 复杂的语法：如模板、智能指针、多线程等。
2. 调试困难：指针错误、内存泄漏、未定义行为可能让人头疼。

如何应对：

• 将大问题拆解成小问题࿰class="tags" href="/C.html" title=c>c;逐步解决。
• 不断重复基础知识࿰class="tags" href="/C.html" title=c>c;以加深理解。
• 保持兴趣࿰class="tags" href="/C.html" title=c>c;尝试一些有趣的项目࿰class="tags" href="/C.html" title=c>c;比如写一个游戏、制作一个简单的图形程序。

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小结
学习C++需要一个循序渐进的过程࿰class="tags" href="/C.html" title=c>c;从基础语法到面向对象编程࿰class="tags" href="/C.html" title=c>c;再到进阶的模板和并发编程࿰class="tags" href="/C.html" title=c>c;每一步都需要耐心和实践。通过充分利用学习资源、进行大量编码练习࿰class="tags" href="/C.html" title=c>c;以及挑战实际项目࿰class="tags" href="/C.html" title=c>c;你一定可以成为C++的高手。记住࿰class="tags" href="/C.html" title=c>c;学习的核心在于理解࿰class="tags" href="/C.html" title=c>c;而非死记硬背。

祝你学有所成࿰class="tags" href="/C.html" title=c>c;享受C++编程的乐趣！

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