foo.cpp: In function 'int main()':
foo.cpp:4:2: error: 'cin' was not declared in this scope
foo.cpp:4:2: note: suggested alternative:
In file included from foo.cpp:1:0:
c:\mingw32\bin\../lib/gcc/mingw32/4.7.1/include/c++/iostream:61:18: note:   'std::cin'
foo.cpp:5:5: error: 'cout' was not declared in this scope
foo.cpp:5:5: note: suggested alternative:
In file included from foo.cpp:1:0:
c:\mingw32\bin\../lib/gcc/mingw32/4.7.1/include/c++/iostream:62:18: note:   'std::cout'
foo.cpp:5:21: error: 'endl' was not declared in this scope
foo.cpp:5:21: note: suggested alternative:
In file included from c:\mingw32\bin\../lib/gcc/mingw32/4.7.1/include/c++/iostream:40:0,
                 from foo.cpp:1:
c:\mingw32\bin\../lib/gcc/mingw32/4.7.1/include/c++/ostream:562:5: note:   'std::endl'