/in/foo.cc:23:9: error: 'double Account::getBalance()' cannot be overloaded
  double getBalance();
         ^~~~~~~~~~
/in/foo.cc:13:9: error: with 'double Account::getBalance()'
  double getBalance() { return balance; }
         ^~~~~~~~~~
/in/foo.cc:74:8: error: redefinition of 'double Account::getBalance()'
 double Account::getBalance()
        ^~~~~~~
/in/foo.cc:13:9: note: 'double Account::getBalance()' previously defined here
  double getBalance() { return balance; }
         ^~~~~~~~~~
/in/foo.cc: In member function 'double CheckingAccount::debit(double)':
/in/foo.cc:114:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^