/in/foo.cc: In function 'int main()':
/in/foo.cc:5:12: warning: unused variable 'h' [-Wunused-variable]
  int ra,ch,h,f;
            ^
/in/foo.cc:5:14: warning: unused variable 'f' [-Wunused-variable]
  int ra,ch,h,f;
              ^