account: implement deposit, withdraw, and getter

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

account.cpp

@@ -1,6 +1,4 @@
 #include <iostream>
-#include <cmath>
-#include <cstdlib>
 
 using namespace std;
 
@@ -10,4 +8,17 @@ Account::Account ( double initial_balance ) : balance(initial_balance) {
 }
 
 Account::~Account () {
+	cout << "account deleted" << endl;
+}
+
+double Account::getBalance() const {
+	return balance;
+}
+
+void Account::deposit(double amount) {
+	balance += amount;
+}
+
+void Account::withdraw(double amount) {
+	balance -= amount;
 }