blocks|key|5541033|text|只需写|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5541034|string+q="C:\\Users\\georg\\Desktop\\XY.txt";|code-block|syntax|javascript|5541035|或使用原始字符串文字|5541036|string+q=R"(C:\Users\georg\Desktop\XY.txt)";|5541037|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>Just write</p>

<pre><code>string q="C:\\Users\\georg\\Desktop\\XY.txt";
</code></pre>

<p>Or use a raw string literal</p>

<pre><code>string q=R"(C:\Users\georg\Desktop\XY.txt)";
</code></pre>


blocks|key|5541086|text|您应该在引号中使用\来添加单个。所以你的第一行就是问题所在。它应该是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5541087|string+q="C:\\Users\\georg\\Desktop\\XY.txt";|code-block|syntax|javascript|5541088|然后剩下的就可以用了。|5541089|编辑|offset|length|style|BOLD|5541090|经过额外的解释，我发现了后续代码的问题。应将其固定为以下值：|5541091|for+(int+i+=+0;+i+<+q.length();+%2B%2Bi)+{
++++if+(q[i]+==+'\\')+{
++++++++q.insert(i,1,x);
++++++++i%2B%2B;
++++}
}|5541092|我来解释一下，首先，你只需要1个额外的\所以insert的第二个参数应该是1。在插入之后，你需要跳过inserted+\，因此i%2B%2B；|5541093|entityMap^0|0|0|0|0|2|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Z|8|@$K|10|L|11|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

<p>You should use \ within quotes to add a single . So your first line is the problem. It should be </p>

<pre><code>string q="C:\\Users\\georg\\Desktop\\XY.txt";
</code></pre>

<p>Then the rest will work.</p>

<p><strong>EDIT</strong> </p>

<p>after additional explanation, I found problems with the follow up code. It should be fixed to the following:</p>

<pre><code>for (int i = 0; i &lt; q.length(); ++i) {
    if (q[i] == '\\') {
        q.insert(i,1,x);
        i++;
    }
}
</code></pre>

<p>Let me explain, first of all, you need only 1 additional \ so second parameter of insert should be 1. After inserting, you need to skip inserted \, hence i++;</p>


blocks|key|4073216|text|问题是第一行要么需要是一个raw+string+literal，要么需要包含\\：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4073217|#include+<string>
#include+<iostream>

using+namespace+std;

int+main()
{
++++string+q++=+R"(C:\Users\georg\Desktop\XY.txt)";+//+Raw+(C%2B%2B11+and+higher)
++++string+q2+=+"C:\\Users\\georg\\Desktop\\XY.txt";+//+Escaped

++++cout+<<+q+<<+"\n"+++//+Outputs:+C:\Users\georg\Desktop\XY.txt
+++++++++<<+q2+<<+"\n";+//+Outpits:+C:\Users\georg\Desktop\XY.txt
}|code-block|syntax|javascript|4073218|正如所写的，它试图使用\U、\g等作为特殊字符。|4073219|4073220|更新:要真正做你所要求的事情，你可能想要这样做：|4073221|#include+<string>
#include+<iostream>

using+namespace+std;

//+From+http://stackoverflow.com/a/15372760/201787
void+replaceAll(+string+&s,+const+string+&search,+const+string+&replace+)+{
++++for(+size_t+pos+=+0;+;+pos+%2B=+replace.length()+)+{
++++++++//+Locate+the+substring+to+replace
++++++++pos+=+s.find(+search,+pos+);
++++++++if(+pos+==+string::npos+)+break;
++++++++//+Replace+by+erasing+and+inserting
++++++++s.erase(+pos,+search.length()+);
++++++++s.insert(+pos,+replace+);
++++}
}

int+main()
{
++++string+q+=+R"(C:\Users\georg\Desktop\XY.txt)";+//+Raw+(C%2B%2B11+and+higher)
++++string+q2+=+"C:\\Users\\georg\\Desktop\\XY.txt";+//+Escaped
++++string+q3;
++++std::cin+>>+q3;+//+Does+not+handle+whitespace

++++replaceAll(+q,+"\\",+"\\\\"+);
++++replaceAll(+q2,+"\\",+"\\\\"+);
++++replaceAll(+q3,+"\\",+"\\\\"+);

++++cout+<<+q+<<+"\n"
+++++++++<<+q2+<<+"\n"
+++++++++<<+q3+<<+"\n";
}|4073222|如果用户输入C:\Users\georg\Desktop\XY.txt，它将输出以下内容：|4073223|C:\\Users\\georg\\Desktop\\XY.txt+
C:\\Users\\georg\\Desktop\\XY.txt
C:\\Users\\georg\\Desktop\\XY.txt|4073224|entityMap|0|LINK|mutability|MUTABLE|url|http://en.cppreference.com/w/cpp/language/string_literal^0|12|2|D|I|0|0|0|B|2|E|2|0|0|0|0|6|T|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|F|3|G|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1G|8|@]|D|@]|E|$]]|$1|P|3|Q|5|H|7|1H|8|@]|D|@]|E|$I|J]]|$1|R|3|S|5|6|7|1I|8|@$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|T|3|U|5|H|7|1L|8|@]|D|@]|E|$I|J]]|$1|V|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]]|W|$X|$5|Y|Z|10|E|$11|12]]]]

<p>The problem is that the first line either needs to be a <a href="http://en.cppreference.com/w/cpp/language/string_literal" rel="nofollow">raw string literal</a> or have <code>\\</code> in it:</p>

<pre><code>#include &lt;string&gt;
#include &lt;iostream&gt;

using namespace std;

int main()
{
    string q  = R"(C:\Users\georg\Desktop\XY.txt)"; // Raw (C++11 and higher)
    string q2 = "C:\\Users\\georg\\Desktop\\XY.txt"; // Escaped

    cout &lt;&lt; q &lt;&lt; "\n"   // Outputs: C:\Users\georg\Desktop\XY.txt
         &lt;&lt; q2 &lt;&lt; "\n"; // Outpits: C:\Users\georg\Desktop\XY.txt
}
</code></pre>

<p>As written, it is trying to use <code>\U</code>, <code>\g</code>, etc. as special characters.</p>

<hr>

<p><em>Update</em>: To actually do what you are asking, you'd want to do something like:</p>

<pre><code>#include &lt;string&gt;
#include &lt;iostream&gt;

using namespace std;

// From http://stackoverflow.com/a/15372760/201787
void replaceAll( string &amp;s, const string &amp;search, const string &amp;replace ) {
    for( size_t pos = 0; ; pos += replace.length() ) {
        // Locate the substring to replace
        pos = s.find( search, pos );
        if( pos == string::npos ) break;
        // Replace by erasing and inserting
        s.erase( pos, search.length() );
        s.insert( pos, replace );
    }
}

int main()
{
    string q = R"(C:\Users\georg\Desktop\XY.txt)"; // Raw (C++11 and higher)
    string q2 = "C:\\Users\\georg\\Desktop\\XY.txt"; // Escaped
    string q3;
    std::cin &gt;&gt; q3; // Does not handle whitespace

    replaceAll( q, "\\", "\\\\" );
    replaceAll( q2, "\\", "\\\\" );
    replaceAll( q3, "\\", "\\\\" );

    cout &lt;&lt; q &lt;&lt; "\n"
         &lt;&lt; q2 &lt;&lt; "\n"
         &lt;&lt; q3 &lt;&lt; "\n";
}
</code></pre>

<p>Which prints the following if the user enters <code>C:\Users\georg\Desktop\XY.txt</code>
:</p>

<pre><code>C:\\Users\\georg\\Desktop\\XY.txt 
C:\\Users\\georg\\Desktop\\XY.txt
C:\\Users\\georg\\Desktop\\XY.txt
</code></pre>


blocks|key|4073281|text|目标|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4073282|在字符串中找到的每个字符串中添加一个额外的反斜杠(用于另一个程序)|4073283|当前问题|4073284|4073285|示例字符串没有正确转义(最简单的是使用原始字符串)|ordered-list-item|4073286|+for循环一次插入4个反斜杠，因此永远不会到达末尾。|offset|length|style|CODE|4073287|4073288|使用C%2B%2B11的解决方案|4073289|这将为每个已经存在的值添加一个反斜杠：|4073290|#include+<iostream>
#include+<string>

int+main()
{
++++std::string+q+=+R"(C:\Users\georg\Desktop\XY.txt)";

++++char+x='\\';


++++for+(int+i+=+0;+i+<+q.length();+%2B%2Bi)+{
++++++++if+(q[i]+==+'\\')+{
++++++++++++q.insert(%2B%2Bi,1,x);
++++++++}

++++}
++++return+0;
}|code-block|syntax|javascript|4073291|不带原始字符串的解决方案|4073292|#include+<iostream>
#include+<string>

int+main()
{
++++//std::string+q+=+R"(C:\Users\georg\Desktop\XY.txt)";
++++std::string+q+=+"C:\\Users\\georg\\Desktop\\XY.txt";

++++char+x='\\';


++++for+(unsigned+i+=+0;+i+<+q.length();+%2B%2Bi)+{
++++++++if+(q[i]+==+'\\')+{
++++++++++++q.insert(%2B%2Bi,1,x);
++++++++}
++++}

++++std::cout+<<+q;

++++return+0;
}|4073293|Result|4073294|C:\\Users\\georg\\Desktop\\XY.txt|4073295|entityMap|0|LINK|mutability|MUTABLE|url|http://coliru.stacked-crooked.com/a/2712fced837d2583^0|0|0|0|0|0|1|3|0|0|0|0|0|0|0|0|6|0|0|0^^$0|@$1|2|3|4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1G|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1H|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|1J|8|@]|9|@]|A|$]]|$1|J|3|K|5|I|7|1K|8|@$L|1L|M|1M|N|O]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1O|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1P|8|@]|9|@]|A|$]]|$1|U|3|V|5|W|7|1Q|8|@]|9|@]|A|$X|Y]]|$1|Z|3|10|5|6|7|1R|8|@]|9|@]|A|$]]|$1|11|3|12|5|W|7|1S|8|@]|9|@]|A|$X|Y]]|$1|13|3|14|5|6|7|1T|8|@]|9|@$L|1U|M|1V|1|1W]]|A|$]]|$1|15|3|16|5|W|7|1X|8|@]|9|@]|A|$X|Y]]|$1|17|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]]|18|$19|$5|1A|1B|1C|A|$1D|1E]]]]

<h2>Objective</h2>

<p>Add an extra backslash to each one found in the string (for use in another program)</p>

<h2>Current issues</h2>

<ol>
<li>Example string is not escaped properly (easiest is to use a raw string)</li>
<li>The <code>for</code> loop inserts 4 backslashes at a time and so will never reach the end.</li>
</ol>

<h2>Solution with C++11</h2>

<p>This will add a backslash to each one that is already there:</p>

<pre><code>#include &lt;iostream&gt;
#include &lt;string&gt;

int main()
{
    std::string q = R"(C:\Users\georg\Desktop\XY.txt)";

    char x='\\';


    for (int i = 0; i &lt; q.length(); ++i) {
        if (q[i] == '\\') {
            q.insert(++i,1,x);
        }

    }
    return 0;
}
</code></pre>

<h2>Solution without raw strings</h2>

<pre><code>#include &lt;iostream&gt;
#include &lt;string&gt;

int main()
{
    //std::string q = R"(C:\Users\georg\Desktop\XY.txt)";
    std::string q = "C:\\Users\\georg\\Desktop\\XY.txt";

    char x='\\';


    for (unsigned i = 0; i &lt; q.length(); ++i) {
        if (q[i] == '\\') {
            q.insert(++i,1,x);
        }
    }

    std::cout &lt;&lt; q;

    return 0;
}
</code></pre>

<h2><a href="http://coliru.stacked-crooked.com/a/2712fced837d2583" rel="nofollow">Result</a></h2>

<pre><code>C:\\Users\\georg\\Desktop\\XY.txt
</code></pre>


<p>I am tryin to insert a \ charcter into a string so I would get</p>

<p>C:\\Users\\dave\\Desktop\\XY.txt
instead of 
C:\Users\georg\Desktop\XY.txt</p>

<p>here is code but for some reason it does not work</p>

<pre><code>string q="C:\Users\georg\Desktop\XY.txt";
char x='\\';


for (int i = 0; i &lt; q.length(); ++i) {
if (q[i] == '\\')
 q.insert(i,4,x);
 }
</code></pre>


inserting the \ character into a string

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我尝试在字符串中插入一个\字符，这样我就可以得到用C:\Users\dave\Desktop\XY.txt代替C:\Users\georg\Desktop\XY.txt以下是代码，但由于某些原因，它不能工作string q="C:\Users\georg\Desktop\XY.txt";char x='\\';for ...

问在字符串中插入\字符
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问在字符串中插入\字符EN