text: //
  //  main.cpp
  //  ex2_17
  //
  //  Created by 闫梦奎 on 2018/10/23.
  //  Copyright © 2018年 com.yanmk. All rights reserved.
  //
  
  #include <iostream>
  
  int main(int argc, const char * argv[]) {
      int i, &ri=i;
      i=5;ri=10;
      std::cout << i << " " << ri << std::endl;
  
  }
  