#include <stdio.h>
#include <stdlib.h> 
#include <stdbool.h>

typedef struct account *Account;

/** Opens a new account with zero balance */
Account AccountOpen(void);

/** Closes an account */
void AccountClose(Account acc);

/** Returns account balance */
int AccountBalance(Account acc);

/** Withdraws money from account
Returns true if enough balance, false otherwise
Assumes amount is positive */
bool AccountWithdraw(Account acc, int amount);

/** Deposits money into account
Assumes amount is positive */
void AccountDeposit(Account acc, int amount);