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C++

C++删除字符串中特定的字符

//处理string类型的方法del_sp(string &str)待测试
//处理C-Style的方法可用,可以考虑将该方法改写为void del_ch(char *src , char ch),使其更加通用化。

#include <iostream>
#include <string>
using namespace std;
void del_sp(char *src);    // 删除C风格字符串中的空格
void del_sp(string &str);  // 重载del_sp,调用C风格的函数
int main()
{
    char hl[] = "删 除 空 格Hello world!   Hello world!   88  ";
    cout << hl << endl;
    del_sp(hl);
    cout << hl << endl;

    string str("删 除 空 格Hello world!   Hello world!   88  ");
    cout << str << "\n长度" << str.size() << endl;
    del_sp(str);  //调用重载的 del_sp
    cout << str << "\n长度" << str.size() << endl;

    return 0;
}

void del_sp(char *src)    // 删除C风格字符串中的空格
{
    char * fp = src;
    while (*src) {
        if (*src != ' ') { // 如果不是空格就复制
            *fp = *src;
            fp++;
        }
        src++;
    }
    *fp = '\0' ; //封闭字符串
}

void del_sp(string &str)   // 删除string字符串中的空格
{
    // 因为str.c_str() 是const的,不能直接修改,
    // 所以要复制一个临时的,然后修改后换回去
    char tmp[str.size()+1];
    memcpy(&tmp, str.c_str(), str.size() + 1);
    del_sp(tmp);    // 重载del_sp,调用C风格的函数
    str = tmp;
}
https://snipt.net/embed/e4e11d8606077fdadea43b39a8464006/
/raw/e4e11d8606077fdadea43b39a8464006/
e4e11d8606077fdadea43b39a8464006
cpp
C++
45
2019-06-20T05:28:07
True
False
False
Jul 10, 2012 at 09:12 AM
/api/public/snipt/43398/
c-6
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a> <a href="#L-28">28</a> <a href="#L-29">29</a> <a href="#L-30">30</a> <a href="#L-31">31</a> <a href="#L-32">32</a> <a href="#L-33">33</a> <a href="#L-34">34</a> <a href="#L-35">35</a> <a href="#L-36">36</a> <a href="#L-37">37</a> <a href="#L-38">38</a> <a href="#L-39">39</a> <a href="#L-40">40</a> <a href="#L-41">41</a> <a href="#L-42">42</a> <a href="#L-43">43</a> <a href="#L-44">44</a> <a href="#L-45">45</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="c1">//处理string类型的方法del_sp(string &amp;str)待测试</span> </span><span id="L-2"><a name="L-2"></a><span class="c1">//处理C-Style的方法可用,可以考虑将该方法改写为void del_ch(char *src , char ch),使其更加通用化。</span> </span><span id="L-3"><a name="L-3"></a> </span><span id="L-4"><a name="L-4"></a><span class="cp">#include</span> <span class="cpf">&lt;iostream&gt;</span><span class="cp"></span> </span><span id="L-5"><a name="L-5"></a><span class="cp">#include</span> <span class="cpf">&lt;string&gt;</span><span class="cp"></span> </span><span id="L-6"><a name="L-6"></a><span class="k">using</span> <span class="k">namespace</span> <span class="n">std</span><span class="p">;</span> </span><span id="L-7"><a name="L-7"></a><span class="kt">void</span> <span class="nf">del_sp</span><span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span> <span class="c1">// 删除C风格字符串中的空格</span> </span><span id="L-8"><a name="L-8"></a><span class="kt">void</span> <span class="nf">del_sp</span><span class="p">(</span><span class="n">string</span> <span class="o">&amp;</span><span class="n">str</span><span class="p">);</span> <span class="c1">// 重载del_sp,调用C风格的函数</span> </span><span id="L-9"><a name="L-9"></a><span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> </span><span id="L-10"><a name="L-10"></a><span class="p">{</span> </span><span id="L-11"><a name="L-11"></a> <span class="kt">char</span> <span class="n">hl</span><span class="p">[]</span> <span class="o">=</span> <span class="s">&quot;删 除 空 格Hello world! Hello world! 88 &quot;</span><span class="p">;</span> </span><span id="L-12"><a name="L-12"></a> <span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">hl</span> <span class="o">&lt;&lt;</span> <span class="n">endl</span><span class="p">;</span> </span><span id="L-13"><a name="L-13"></a> <span class="n">del_sp</span><span class="p">(</span><span class="n">hl</span><span class="p">);</span> </span><span id="L-14"><a name="L-14"></a> <span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">hl</span> <span class="o">&lt;&lt;</span> <span class="n">endl</span><span class="p">;</span> </span><span id="L-15"><a name="L-15"></a> </span><span id="L-16"><a name="L-16"></a> <span class="n">string</span> <span class="n">str</span><span class="p">(</span><span class="s">&quot;删 除 空 格Hello world! Hello world! 88 &quot;</span><span class="p">);</span> </span><span id="L-17"><a name="L-17"></a> <span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">str</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;</span><span class="se">\n</span><span class="s">长度&quot;</span> <span class="o">&lt;&lt;</span> <span class="n">str</span><span class="p">.</span><span class="n">size</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">endl</span><span class="p">;</span> </span><span id="L-18"><a name="L-18"></a> <span class="n">del_sp</span><span class="p">(</span><span class="n">str</span><span class="p">);</span> <span class="c1">//调用重载的 del_sp</span> </span><span id="L-19"><a name="L-19"></a> <span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">str</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;</span><span class="se">\n</span><span class="s">长度&quot;</span> <span class="o">&lt;&lt;</span> <span class="n">str</span><span class="p">.</span><span class="n">size</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">endl</span><span class="p">;</span> </span><span id="L-20"><a name="L-20"></a> </span><span id="L-21"><a name="L-21"></a> <span class="k">return</span> <span class="mi">0</span><span class="p">;</span> </span><span id="L-22"><a name="L-22"></a><span class="p">}</span> </span><span id="L-23"><a name="L-23"></a> </span><span id="L-24"><a name="L-24"></a><span class="kt">void</span> <span class="nf">del_sp</span><span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="c1">// 删除C风格字符串中的空格</span> </span><span id="L-25"><a name="L-25"></a><span class="p">{</span> </span><span id="L-26"><a name="L-26"></a> <span class="kt">char</span> <span class="o">*</span> <span class="n">fp</span> <span class="o">=</span> <span class="n">src</span><span class="p">;</span> </span><span id="L-27"><a name="L-27"></a> <span class="k">while</span> <span class="p">(</span><span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-28"><a name="L-28"></a> <span class="k">if</span> <span class="p">(</span><span class="o">*</span><span class="n">src</span> <span class="o">!=</span> <span class="sc">&#39; &#39;</span><span class="p">)</span> <span class="p">{</span> <span class="c1">// 如果不是空格就复制</span> </span><span id="L-29"><a name="L-29"></a> <span class="o">*</span><span class="n">fp</span> <span class="o">=</span> <span class="o">*</span><span class="n">src</span><span class="p">;</span> </span><span id="L-30"><a name="L-30"></a> <span class="n">fp</span><span class="o">++</span><span class="p">;</span> </span><span id="L-31"><a name="L-31"></a> <span class="p">}</span> </span><span id="L-32"><a name="L-32"></a> <span class="n">src</span><span class="o">++</span><span class="p">;</span> </span><span id="L-33"><a name="L-33"></a> <span class="p">}</span> </span><span id="L-34"><a name="L-34"></a> <span class="o">*</span><span class="n">fp</span> <span class="o">=</span> <span class="sc">&#39;\0&#39;</span> <span class="p">;</span> <span class="c1">//封闭字符串</span> </span><span id="L-35"><a name="L-35"></a><span class="p">}</span> </span><span id="L-36"><a name="L-36"></a> </span><span id="L-37"><a name="L-37"></a><span class="kt">void</span> <span class="nf">del_sp</span><span class="p">(</span><span class="n">string</span> <span class="o">&amp;</span><span class="n">str</span><span class="p">)</span> <span class="c1">// 删除string字符串中的空格</span> </span><span id="L-38"><a name="L-38"></a><span class="p">{</span> </span><span id="L-39"><a name="L-39"></a> <span class="c1">// 因为str.c_str() 是const的,不能直接修改,</span> </span><span id="L-40"><a name="L-40"></a> <span class="c1">// 所以要复制一个临时的,然后修改后换回去</span> </span><span id="L-41"><a name="L-41"></a> <span class="kt">char</span> <span class="n">tmp</span><span class="p">[</span><span class="n">str</span><span class="p">.</span><span class="n">size</span><span class="p">()</span><span class="o">+</span><span class="mi">1</span><span class="p">];</span> </span><span id="L-42"><a name="L-42"></a> <span class="n">memcpy</span><span class="p">(</span><span class="o">&amp;</span><span class="n">tmp</span><span class="p">,</span> <span class="n">str</span><span class="p">.</span><span class="n">c_str</span><span class="p">(),</span> <span class="n">str</span><span class="p">.</span><span class="n">size</span><span class="p">()</span> <span class="o">+</span> <span class="mi">1</span><span class="p">);</span> </span><span id="L-43"><a name="L-43"></a> <span class="n">del_sp</span><span class="p">(</span><span class="n">tmp</span><span class="p">);</span> <span class="c1">// 重载del_sp,调用C风格的函数</span> </span><span id="L-44"><a name="L-44"></a> <span class="n">str</span> <span class="o">=</span> <span class="n">tmp</span><span class="p">;</span> </span><span id="L-45"><a name="L-45"></a><span class="p">}</span> </span></pre></div> </td></tr></table>
C++, String