// demonstrates possible uses of concatenation
// Mikhail Nesterenko
// 10/14/2010

#include <iostream>
#include <string>

using std::cout; using std::endl; using std::string;

int main () {
  string s1;

  s1 = "hell"; // this is allowed
  
  // at least one operand has to be a string variable
  // s1 = "hell" + "o"   <-- this is not allowed!

  s1 = s1 + 'o'; // this is allowed
  s1 +="!";      // so is this

  cout << s1 << endl;
}