View Compilation Error

0_0_29875937_28706.cpp: In function 'int main()':
0_0_29875937_28706.cpp:3:1: error: 'cout' was not declared in this scope
 cout <<"why"<<endl;
 ^
0_0_29875937_28706.cpp:3:1: note: suggested alternative:
In file included from 0_0_29875937_28706.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
0_0_29875937_28706.cpp:3:15: error: 'endl' was not declared in this scope
 cout <<"why"<<endl;
               ^
0_0_29875937_28706.cpp:3:15: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_29875937_28706.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:564:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^