mechanics: draft bank feature

bank.cpp

@@ -0,0 +1,50 @@
+/**
+ * @file bank.cpp
+ * @brief Implementation of the Bank mechanics
+ */
+#include "bank.h"
+// #include "random_price.h" // generate_interest_rate()
+
+void Bank::init(void) {
+    /** Initialize initial bank state */
+    double balance = 0;
+    // double interest_rate = generate_interest_rate();
+}
+
+bool Bank::deposit(double & wallet, double amount) {
+    /**
+     * Accept two parameters: current wallet balance (pass-by-reference)
+     * and the amount to deposit. If the wallet has enough money, deposit
+     * the amount to the bank account and return true. Otherwise, return false.
+     */
+    if (wallet >= amount) {
+        wallet -= amount;
+        balance += amount;
+        return true;
+    }
+    /** else */ return false;
+}
+
+bool Bank::withdraw(double & wallet, double amount) {
+    /*
+    Accept two parameters: current wallet balance (pass-by-reference)
+    and the amount to withdraw. If the bank account has enough money,
+    withdraw the amount from the bank account and return true. Otherwise,
+    return false.
+    */
+    if (balance >= amount) {
+        wallet += amount;
+        balance -= amount;
+        return true;
+    }
+    /** else */ return false;
+}
+
+void Bank::next_round(void) {
+    /**
+     * Simply multiply the balance with the interest rate
+     * Should be called when proceed to next round
+     */
+    balance *= (1 + interest_rate);
+    return;
+}

bank.h

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+#ifndef BANK_H
+#define BANK_H
+
+class Bank {
+    public:
+        /** Initialize initial bank state */
+        void init(void);
+
+        /**
+         * Deposit money to the bank account.
+         * @param wallet current wallet balance (pass-by-reference)
+         * @param amount amount to deposit
+         * @return true if the deposit is successful, false otherwise
+         */
+
+        bool deposit(double & wallet, double amount);
+
+        /**
+         * Withdraw money from the bank account.
+         * @param wallet current wallet balance (pass-by-reference)
+         * @param amount amount to withdraw
+         * @return true if the withdrawal is successful, false otherwise
+         */
+        bool withdraw(double & wallet, double amount);
+
+        /**
+         * Proceed to the next round, calculate the new balance based on the interest rate.
+         */
+        void next_round(void);
+
+        /**
+         * Get the current bank balance.
+         * @return the current bank balance
+         */
+        double get_balance(void) {
+            return balance;
+        }
+
+        /**
+         * Get the current interest rate.
+         * @return the current interest rate
+         */
+        double get_interest_rate(void) {
+            return interest_rate;
+        }
+
+        /**
+         * Set the interest rate.
+         * @param rate the new interest rate
+         */
+        void set_interest_rate(double rate) {
+            interest_rate = rate;
+        }
+
+    private:
+        double balance;
+        double interest_rate;
+};
+
+#endif