#include
#include
using namespace std;
int main()
{
string str1("A");
string str2("B");
string str3("G");
string str4;
cout << " str1: " << str1 << endl;
cout << " str2: " << str2 << endl;
cout << " str3: " << str3 << "\n\n";
// Use push_back() to add characters to str4.
for(char ch = 'A'; ch <= 'Z'; ++ch)
str4.push_back(ch);
cout << "str4 after calls to push_back(): " << str4 << endl;
cout << "Size and capacity of str4 is now " << str4.size() << " " << str4.capacity() << "\n\n";
return 0;
}