/in/foo.cc: In function 'int main()':
/in/foo.cc:9:20: error: expected ')' before ';' token
  for(cin>>o;a<o;a++;){
                    ^
/in/foo.cc:9:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(cin>>o;a<o;a++;){
  ^~~
/in/foo.cc:9:21: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  for(cin>>o;a<o;a++;){
                     ^
/in/foo.cc:9:21: error: expected primary-expression before ')' token