迭代器在VC6中不能用？

#include <iostream>
#include <vector>
#include <string>
using std:: cin;
using std:: cout;
using std:: endl;
using std:: string;
using std:: vector;


int main()
{
    vector<string> c;
    string s1;
   
    cout<< "enter strings"<<endl;
    while(cin >> s1)
        c.push_back(s1);
    char **prr = new char *[c.size()];
    size_t ix = 0;
    for( vector<string>::iterator iter = c.begin();iter != c.end();++iter,++ix)//这地方老是报错
    {
        char *p = new char[(*iter).size()+1];
        strcpy(p,(*iter).c_str());
        prr[ix]=p;
    }
    for(ix=0;ix!=c.size();++ix)
        delete [] prr;
    return 0;
}