prog.cpp: In function ‘int main()’:
prog.cpp:4:36: error: ‘endl’ was not declared in this scope
std::cout << "Hello, world" << endl;
^
prog.cpp:4:36: 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)
^