blocks|key|426347|text|const+char*+str+=+"abcde";
int+len+=+strlen(str);
for+(int+i+=+0;+i+<+len;+i%2B%2B)
{
++++char+chr+=+str[i];
++++//do+something....
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|426348|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>const char* str = "abcde";
int len = strlen(str);
for (int i = 0; i &lt; len; i++)
{
 char chr = str[i];
 //do something....
}
</code></pre>

blocks|key|640818|text|可以像这样实现for循环：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|640819|string+str("HELLO");
for+(int+i+=+0;+i+<+str.size();+i%2B%2B){
++++cout+<<+str[i];
}|code-block|syntax|javascript|640820|这将逐个字符地打印字符串。str[i]返回索引i处的字符。|offset|length|style|CODE|640821|如果是字符数组：|640822|char+str[6]+=+"hello";
for+(int+i+=+0;+str[i]+!=+'\0';+i%2B%2B){
++++cout+<<+str[i];
}|640823|基本上以上两种是c%2B%2B支持的两种类型的字符串。第二个被称为c字符串，第一个被称为std字符串或(+c%2B%2B字符串).I建议使用c%2B%2B字符串，非常容易处理。|640824|entityMap^0|0|0|D|6|N|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]|$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

A for loop can be implemented like this:

<pre><code>string str("HELLO");
for (int i = 0; i &lt; str.size(); i++){
 cout &lt;&lt; str[i];
}
</code></pre>

This will print the string character by character. <code>str[i]</code> returns character at index <code>i</code>.

If it is a character array:

<pre><code>char str[6] = "hello";
for (int i = 0; str[i] != '\0'; i++){
 cout &lt;&lt; str[i];
}
</code></pre>

Basically above two are two type of strings supported by c++.
The second is called c string and the first is called std string or(c++ string).I would suggest use c++ string,much Easy to handle.

blocks|key|640864|text|在现代C%2B%2B中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|640865|std::string+s("Hello+world");

for+(char+&+c+:+s)
{
++++std::cout+<<+"One+character:+"+<<+c+<<+"\n";
++++c+=+'*';
}|code-block|syntax|javascript|640866|在C%2B%2B98/03中：|640867|for+(std::string::iterator+it+=+s.begin(),+end+=+s.end();+it+!=+end;+%2B%2Bit)
{
++++std::cout+<<+"One+character:+"+<<+*it+<<+"\n";
++++*it+=+'*';
}|640868|对于只读迭代，您可以在C%2B%2B98中使用std::string::const_iterator，在C%2B%2B11中使用for+(char+const+&+c+:+s)或仅使用for+(char+c+:+s)。|offset|length|style|CODE|640869|entityMap^0|0|0|0|0|J|R|1K|O|2C|G|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]|$M|Z|N|10|O|P]|$M|11|N|12|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

In modern C++:

<pre><code>std::string s("Hello world");

for (char &amp; c : s)
{
 std::cout &lt;&lt; "One character: " &lt;&lt; c &lt;&lt; "\n";
 c = '*';
}
</code></pre>

In C++98/03:

<pre><code>for (std::string::iterator it = s.begin(), end = s.end(); it != end; ++it)
{
 std::cout &lt;&lt; "One character: " &lt;&lt; *it &lt;&lt; "\n";
 *it = '*';
}
</code></pre>

For read-only iteration, you can use <code>std::string::const_iterator</code> in C++98, and <code>for (char const &amp; c : s)</code> or just <code>for (char c : s)</code> in C++11.

blocks|key|640925|text|对于C-string+(char+[])，您应该这样做：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|640926|char+mystring[]+=+"My+String";
int+size+=+strlen(mystring);
int+i;
for(i+=+0;+i+<+size;+i%2B%2B)+{
++++char+c+=+mystring[i];
}|code-block|syntax|javascript|640927|对于std::string，您可以使用str.size()来获取其大小并像示例一样进行迭代，也可以使用迭代器：|640928|std::string+mystring+=+"My+String";
std::string::iterator+it;
for(it+=+mystring.begin();+it+!=+mystring.end();+it%2B%2B)+{
++++char+c+=+*it;
}|640929|entityMap^0|C|7|0|0|2|B|J|A|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

For C-string (<code>char []</code>) you should do something like this:

<pre><code>char mystring[] = "My String";
int size = strlen(mystring);
int i;
for(i = 0; i &lt; size; i++) {
 char c = mystring[i];
}
</code></pre>

For <code>std::string</code> you can use <code>str.size()</code> to get its size and iterate like the example , or could use an iterator:

<pre><code>std::string mystring = "My String";
std::string::iterator it;
for(it = mystring.begin(); it != mystring.end(); it++) {
 char c = *it;
}
</code></pre>

blocks|key|640977|text|for+(int+x+=+0;+x+<+yourString.size();x%2B%2B){
++++++++if+(yourString[x]+==+'a'){
++++++++++++//Do+Something
++++++++}
++++++++if+(yourString[x]+==+'b'){
++++++++++++//Do+Something
++++++++}
++++++++if+(yourString[x]+==+'c'){
++++++++++++//Do+Something
++++++++}
++++++++//...........
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|640978|字符串基本上是一个字符数组，因此您可以指定索引来获取字符。如果您不知道索引，那么可以像上面的代码一样遍历它，但在进行比较时，请确保使用单引号(它指定一个字符)。|unstyled|640979|除此之外，上面的代码是不言自明的。|640980|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>for (int x = 0; x &lt; yourString.size();x++){
 if (yourString[x] == 'a'){
 //Do Something
 }
 if (yourString[x] == 'b'){
 //Do Something
 }
 if (yourString[x] == 'c'){
 //Do Something
 }
 //...........
 }
</code></pre>

A String is basically an array of characters, therefore you can specify the index to get the character. If you don't know the index, then you can loop through it like the above code, but when you're making a comparison, make sure you use single quotes (which specifies a character).

Other than that, the above code is self explanatory.

blocks|key|426581|text|您可以使用字符串库的at函数来获取字符串中的每个字符，就像我这样做的那样|type|unstyled|depth|inlineStyleRanges|entityRanges|data|426582|string+words;
++++for+(unsigned+int+i+=+0;+i+<+words.length();+i%2B%2B)
++++++++{
++++++++++++if+(words.at(i)+==+'+')
++++++++++++{
++++++++++++++++spacecounter%2B%2B;++++//+to+count+all+the+spaces+in+a+string
++++++++++++++++if+(words.at(i+%2B+1)+==+'+')
++++++++++++++++{
++++++++++++++++++++i+%2B=+1;
++++++++++++++++}|code-block|syntax|javascript|426583|这只是我的一段代码，但重点是您可以通过stringname.at(index)访问字符|offset|length|style|CODE|426584|entityMap^0|0|0|J|K|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

you can get every char in a string by using the at function of string library, like i did it like this 

<pre><code>string words;
 for (unsigned int i = 0; i &lt; words.length(); i++)
 {
 if (words.at(i) == ' ')
 {
 spacecounter++; // to count all the spaces in a string
 if (words.at(i + 1) == ' ')
 {
 i += 1;
 }
</code></pre>

this is just a segment of my code but the point is you can access characters by <code>stringname.at(index)</code>

blocks|key|641066|text|这是另一种方法，使用标准算法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|641067|#include+<iostream>
#include+<string>
#include+<algorithm>

int+main()
{
+++std::string+name+=+"some+string";
+++std::for_each(name.begin(),+name.end(),+[]+(char+c)+{
++++++std::cout+<<+c;
+++});
}|code-block|syntax|javascript|641068|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is another way of doing it, using the standard algorithm.

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

int main()
{
 std::string name = "some string";
 std::for_each(name.begin(), name.end(), [] (char c) {
 std::cout &lt;&lt; c;
 });
}
</code></pre>

blocks|key|641113|text|我没有看到任何使用带有"c字符串“的基于范围的for循环的例子。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|641114|char+cs[]+=+"This+is+a+c+string\u0031+\x32+3";

//+range+based+for+loop+does+not+print+'\n'
for+(char&+c+:+cs)+{
++++printf("%25c",+c);
}|code-block|syntax|javascript|641115|不相关但整型数组示例|641116|int+ia[]+=+{1,2,3,4,5,6};

for+(int&+i+:+ia)+{
++++printf("%25d",+i);
}|641117|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|$]]

I don't see any examples using a range based for loop with a "c string".

<pre><code>char cs[] = "This is a c string\u0031 \x32 3";

// range based for loop does not print '\n'
for (char&amp; c : cs) {
 printf("%c", c);
}
</code></pre>

not related but int array example

<pre><code>int ia[] = {1,2,3,4,5,6};

for (int&amp; i : ia) {
 printf("%d", i);
}
</code></pre>

blocks|key|641173|text|您可以使用size()方法获取字符串的长度，并使用方括号运算符访问每个字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|641174|#include<bits/stdc%2B%2B.h>
using+namespace+std;

int+main()
{
+++string+s;
+++cin+>>+s;
+++int+length+=+s.size();
+++for(int+i+=+0;+i+<+length;+i%2B%2B)
+++{
++++++process(s[i]);
+++}
}|code-block|syntax|javascript|641175|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use the size() method to get the lenght of the string and the square bracket operator to access each individual character.
<pre><code>#include&lt;bits/stdc++.h&gt;
using namespace std;

int main()
{
 string s;
 cin &gt;&gt; s;
 int length = s.size();
 for(int i = 0; i &lt; length; i++)
 {
 process(s[i]);
 }
}
</code></pre>

How would I do a for loop on every character in string in C++?

For every character in string

如何在C++中对字符串中的每个字符执行for循环？

问对于字符串中的每个字符
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