foo.cpp: In function 'int main()':
foo.cpp:8:2: error: 'cin' was not declared in this scope
foo.cpp:8:2: note: suggested alternative:
In file included from foo.cpp:2:0:
c:\mingw32\bin\../lib/gcc/mingw32/4.7.1/include/c++/iostream:61:18: note:   'std::cin'
foo.cpp:15:27: error: 'i' was not declared in this scope