#include <string>
#include <iostream>

int main()
{
  std::string s = "hello";
  switch (s[0])
  {
  case 'x':
    s += ", world";
    break;
  case 'y':
  case 'h':
    std::string s;
    s += ", world";
    break;
  }
  std::cout << s << '\n';
}