c++ string 对象操作

字符串转换大小写如下：

 #include "stdafx.h"
 #include <iostream>
 #include <string>

 using namespace std;

 int main()
 {
     string str = "helloworld";
     for (auto begin = str.begin(); begin != str.end(); ++begin)
     {
         *begin = toupper(*begin);
     }

     cout << str << endl;

     system("PAUSE");
     return ;
 }

删除字符串中所有的大写字母:

 #include "stdafx.h"
 #include <iostream>
 #include <string>

 using namespace std;

 int main()
 {
     string str("helloWorld");
     for (auto begin = str.begin(); begin != str.end();)
     {
         if (isupper(*begin))
         {
             begin = str.erase(begin);
             continue;
         }
         ++begin;
     }

     cout << str << endl;

     system("PAUSE");
     return ;
 }

用vector对象初始化string ：

 #include "stdafx.h"
 #include <iostream>
 #include <string>
 #include <vector>

 using namespace std;

 int main()
 {
     vector<char> vect;
     char arry[] = {'h','e','l','l','o'};
     vect.insert(vect.begin(),arry,arry+);
     char *pc = new char[vect.size()+];
     int i = ;
     for (vector<char>::iterator begin = vect.begin(); begin != vect.end(); ++begin)
     {
         pc[i] = *begin;
         ++i;
     }
     pc[vect.size()] = '\0';
     string str(pc);
     delete [] pc;
     cout << str << endl;
     system("PAUSE");
     return ;
 }