/in/foo.cc: In function 'int main()':
/in/foo.cc:15:11: warning: 'e' may be used uninitialized in this function [-Wmaybe-uninitialized]
   else e++;
           ^
/in/foo.cc:14:21: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   else if(f<=60) d++;
                     ^
/in/foo.cc:13:21: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
   else if(f<=35) c++;
                     ^
/in/foo.cc:12:16: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(f<=18) b++;
                ^