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#include <iostream>
 
int main(void)
{
  cout << "Hello World" << endl;
  return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:5:3: error: ‘cout’ was not declared in this scope
   cout << "Hello World" << endl;
   ^
prog.cpp:5:3: note: suggested alternative:
In file included from prog.cpp:1:0:
/usr/include/c++/4.8/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^
prog.cpp:5:28: error: ‘endl’ was not declared in this scope
   cout << "Hello World" << endl;
                            ^
prog.cpp:5:28: note: suggested alternative:
In file included from /usr/include/c++/4.8/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.8/ostream:564:5: note:   ‘std::endl’
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^

Standard output is empty