/in/foo.cc: In function 'int main()':
/in/foo.cc:8:2: error: expected ',' or ';' before 'for'
  for(cin>>x;d==x;d++){
  ^~~
/in/foo.cc:8:14: warning: statement has no effect [-Wunused-value]
  for(cin>>x;d==x;d++){
             ~^~~
/in/foo.cc:8:21: error: expected ';' before ')' token
  for(cin>>x;d==x;d++){
                     ^
/in/foo.cc:10:2: error: expected '}' at end of input
  }
  ^