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  1. #include <iostream>
  2.  
  3. int main() 
  4. {
  5.     char current, last='\n';
  6.  
  7.     while(std::cin.get(current)) 
  8.     {
  9.         if (last == '\n' and current == '\n') 
  10.         {
  11.             std::cout << "Hello world!\n";
  12.             return 0;
  13.         }
  14.         std::cout << current;
  15.         last = current;
  16.     }
  17. }
  18.  
Success #stdin #stdout 0.01s 2728KB
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Hello world!
https://ideone.com/XefcQM
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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