/in/foo.cc: In function 'int main()':
/in/foo.cc:17:4: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   s+=300-h;
   ~^~~~~~~
/in/foo.cc:19:9: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
   else c+=s/100,s%=100;
        ~^~~~~~~