#include <iostream>

#include <string>

using std::string;

using std::cout;

using std::endl;

string push_back(string str1, string str2)

{

    string::iterator iter = str2.begin();

    for (; iter != str2.end(); ++iter)

    {

        str1.push_back(iter);

    }

    return str1;

}

int main()

{

    string str1("Cconnect ");

    string str2("String!");

    string temp(str1);

    cout << "+ or +=: " << str1 + str2 << endl;

    cout << "append: " << str1.append(str2) << endl;

    str1 = temp;

    cout << "push_back: " << push_back(str1, str2) << endl; 

    cout << "others:insert() or str[] .." << endl;

    return 0;

}