/in/foo.cc: In function 'int main()':
/in/foo.cc:19:25: error: 'ftos' was not declared in this scope
  if(to_string(t)==ftos(t){
                         ^
/in/foo.cc:19:26: error: expected ')' before '{' token
  if(to_string(t)==ftos(t){
                          ^