/in/foo.cc: In function 'int main()':
/in/foo.cc:11:2: error: expected ',' or ';' before 'for'
  for(int i=0;i<n;i++){
  ^~~
/in/foo.cc:11:14: error: 'i' was not declared in this scope
  for(int i=0;i<n;i++){
              ^