/in/foo.cc: In function 'int main()':
/in/foo.cc:10:16: error: 'b' was not declared in this scope
  cout<<q<<" "<<b<<" "<<g;
                ^
/in/foo.cc:8:6: warning: unused variable 's' [-Wunused-variable]
  int s=(n%100-g)/10;
      ^