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 ;

 }