c++ string字符串操作

在C++中，可以使用C string的一些函数来对字符串进行操作。你可以使用`length()`函数来获取字符串的长度，然后可以使用循环和下标访问来获取字符串中的字符。例如，可以使用以下代码来获取字符串中的奇数位置的字符：

#include <iostream>
#include <string>
using namespace std;

int main () {
    string s = "hello world!";
    for (int i = 0; i < s.length() ; i++) {
        if (i % 2) {
            cout << s[i];
        }
    }
    cout << endl;
    return 0;
}

这段代码会输出字符串中奇数位置的字符，即"el ol"。。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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