Example of String Utility Operations

   string strA = "hello";
   printCstring(strA.c_str());
   for ( int i = 0; i < strA.length(); i++ )
      cout << strA.data()[i];
   cout << endl;

   strA.resize(10,'#');    // value is "hello#####"
   strA.resize(3);         // value is "hel"

   // The next function is not supported by Visual C++ 6.0
   strA.clear();
   // but erase can be used instead
   strA.erase();
   if ( strA.empty() ) 
      cout << "empty" << endl;

   //size_type copy(char[] s, size_type n,
   //               size_type pos = 0) const;
   strA = "abcdefghi";
   const int MAX = 5;
   char buff[MAX];
   strA.copy(buff,MAX-1,2);
   buff[MAX-1] = 0;           // add C string terminator 
   cout << buff << endl;      // value of buff is "cedf"