#include <string>
#include <iostream>

using namespace std;

class mystr {
  string myString;
public:
  void buildstr(string aString);  // public
  void showstr();
  // constructor
  mystr::mystr();
};

mystr::mystr() {
  myString = "";
}

void mystr::showstr() {
  cout << myString << endl;
}

void mystr::buildstr(string literal) {
    myString = myString + literal; // myString += literal;
} 

int main() {
  mystr theString;

  theString.buildstr("Hello ");
  theString.buildstr("World!");
  theString.showstr();
// The following will not work.  Why?
//  theString.myString = "Hello World!"; 
//  cout << theString.myString;
  return 0;
}