/in/foo.cc: In function 'int main()':
/in/foo.cc:5:9: warning: unused variable 's' [-Wunused-variable]
     int s,f,m,sum,i;
         ^
/in/foo.cc:5:11: warning: unused variable 'f' [-Wunused-variable]
     int s,f,m,sum,i;
           ^
/in/foo.cc:5:13: warning: unused variable 'm' [-Wunused-variable]
     int s,f,m,sum,i;
             ^
/in/foo.cc:6:6: warning: 'i' is used uninitialized in this function [-Wuninitialized]
  if(i*3600==sum);
     ~^~~~~