// определение и присвоение для строк
#include <iostream>
#include <string>
using namespace std;
///////////////////////////////////////////////////////////
int main ( )
{
  string s1 ( "Рыба" );
  string s2 = "Мясо";
  string s3;

  s3 = s1;
  cout << "s3 = " << s3 << endl;

  s3 = "Ни " + s1 + " ни ";
  s3 += s2;
  cout << "s3 = " << s3 << endl;

  s1.swap ( s2 );
  cout << s1 << " не " << s2 << endl;

  return 0;
}