/in/foo.cc: In function 'int main()':
/in/foo.cc:23:15: error: 'i' does not name a type
  for(register i = 0; i < n; i++){
               ^
/in/foo.cc:23:22: error: expected ';' before 'i'
  for(register i = 0; i < n; i++){
                      ^
/in/foo.cc:32:15: error: 's' does not name a type
  for(register s = i = 0; i < n; i++){
               ^
/in/foo.cc:32:26: error: expected ';' before 'i'
  for(register s = i = 0; i < n; i++){
                          ^
/in/foo.cc:39:15: error: 's' does not name a type
  for(register s = i = 0;i < n;i++){
               ^
/in/foo.cc:39:25: error: expected ';' before 'i'
  for(register s = i = 0;i < n;i++){
                         ^