/in/foo.cc:12:11: error: stray '\' in program
    cout<<b\n;
           ^
/in/foo.cc:9:4: error: expected unqualified-id before 'while'
    while(b>=a)
    ^~~~~
/in/foo.cc:12:4: error: 'cout' does not name a type
    cout<<b\n;
    ^~~~
/in/foo.cc:13:4: error: expected unqualified-id before '>' token
    >
    ^