Functional specifications
The account information overview displays savings and credit card information and repayment information (such as subscribing to automatic repayment service and triggering automatic repayment on the repayment day);
The deposit card and credit card can display information, deposit and withdraw money.
The credit card can also set the repayment date, loan, open/cancel the automatic repayment service, manual repayment functions.
The source code to show
The customer class
/ / the customer class
class Client
{
// Fields: name, account
internal string name;
internal Accounts accounts;
// Client class constructor
public Client(string nam, Accounts acco){ name = nam; accounts = acco; }}Copy the codeAccount class
/ / account
class Accounts
{
// Fields: total amount, debit card, credit card
internal float assets = 0;
internal DepositCard depo;
internal CreditCard cred;
// Account class constructor
internal Accounts(DepositCard deposit, CreditCard credit)
{
depo = deposit;
cred = credit;
}
// Calculate the total amount
internal void CalAsserts()
{
assets = depo.balance + cred.balance;
}
// Account information display
internal void Display(Client client, Delegate repayDelegate)
{
Console.WriteLine("It is {0}. ", DateTime.Now);
RepaymentStatus(client, repayDelegate);
depo.Display();
cred.Display();
Console.WriteLine("\n------SUMMARY------\n");
CalAsserts();
Console.WriteLine("Assets: " + assets);
Console.WriteLine("Debt: " + client.accounts.cred.debt);
}
// Payment status
internal void RepaymentStatus(Client client, Delegate repayDelegate)
{
if(client.accounts.cred.debt ! =0)
{
if (DateTime.Today.Day == cred.statement)
{
Console.WriteLine("You Need to Pay Your Debt.");
// Can trigger the event handling method
repayDelegate.Repay(client);
}
else
{
int duration;
duration = Math.Abs(DateTime.Today.Day - cred.statement);
if (DateTime.Today.Day < cred.statement)
{
Console.WriteLine("{0} Day(s) Before This Month's Due Day.\n", duration);
}
else
{
Console.WriteLine("You Have Over Due for {0} Day(s) ! \n", duration); }}}else
{
Console.WriteLine("You Don't Have Debt This Month."); }}// Automatic repayment, credit card is preferred, savings card is second
internal void AutoRepay(Client client)
{
if (cred.balance >= cred.debt)
{
cred.AutoRepay();
Console.WriteLine("-REPAYMENT COMPLETE! -");
}
else
{
float temp = cred.debt - cred.balance;
cred.debt = cred.balance;
cred.AutoRepay();
cred.debt = temp;
if (depo.balance >= cred.debt)
{
depo.AutoRepay(client);
Console.WriteLine("-REPAYMENT COMPLETE! -");
}
else
{
temp = cred.debt - depo.balance;
cred.debt = depo.balance;
depo.AutoRepay(client);
cred.debt = temp;
Console.WriteLine("-BOTH DEPOSIT CARD AND CREDIT CARD BALACE INSUFFICIENT! -\n");
Console.WriteLine("Credit Card Debt: {0}\nCredit Card Statement: {1}", cred.debt, cred.statement);
Console.WriteLine("\nPLEASE TOP-UP!"); }}}}Copy the codeDifferent classes of
// Deposit and withdrawal classes
class TopWithdraw
{
/ / deposit
internal void TopUp(ref float balance)
{
Console.WriteLine("PLEASE ENTER THE AMOUNT YOU WANT TO TOP-UP: ");
int deposit = int.Parse(Console.ReadLine());
balance += deposit;
Console.WriteLine("Deposit: " + deposit);
}
/ / withdrawals
internal void Withdraw(ref float balance)
{
Console.WriteLine("PLEASE ENTER THE AMOUNT YOU WANT TO WITHDRAW: ");
int withdrawal = int.Parse(Console.ReadLine());
balance -= withdrawal;
Console.WriteLine("Withdrawal: "+ withdrawal); }}Copy the codeA cash card class
// debit card type
class DepositCard : TopWithdraw
{
// Field: balance
internal float balance;
// save card class constructor
internal DepositCard(float bala)
{
balance = bala;
}
// Deposit card information display
internal void Display()
{
Console.WriteLine("\n------Deposit Card------\n");
Console.WriteLine("Deposit Card Balance: " + balance);
}
// The debit card will pay automatically
internal void AutoRepay(Client client)
{
Console.WriteLine("\nDEPOSIT CARD REPAYING...");
balance -= client.accounts.cred.debt;
Console.WriteLine("Today is Due Day({0}):\n Repayment: {1}\n Deposit Card Balance: {2}", DateTime.Today.Day, client.accounts.cred.debt, balance);
}
// Deposit card
internal void TopUp()
{
TopUp(ref balance);
Display();
}
// Debit card for withdrawal
internal void Withdraw()
{
Withdraw(refbalance); Display(); }}Copy the codeCredit card type
// Credit card class
class CreditCard : TopWithdraw
{
// Fields: repayment date, Debt, balance
internal int statement;
internal float debt;
internal float balance;
// Credit card class constructor
internal CreditCard(int stat, float dbt, float bala)
{
statement = stat;
debt = dbt;
balance = bala;
}
// Set a repayment date
internal void SetStatement()
{
Console.WriteLine("PLEASE SET STATEMENT OF THE MONTH: ");
do
{
statement = int.Parse(Console.ReadLine());
} while (statement < 1 || statement > 31);
}
/ / lending
internal void Loan()
{
Console.WriteLine("PLEASE ENTER THE AMOUNT YOU WANT TO LOAN: ");
int loan = int.Parse(Console.ReadLine());
debt += loan;
Console.WriteLine("Loan: " + loan);
Display();
}
// Credit card information display
internal void Display()
{
Console.WriteLine("\n------Credit Card------\n");
Console.WriteLine("Credit Card Balance: {0}\nCredit Card Debt: {1}\nCredit Card Statement: {2}", balance, debt, statement);
}
// Automatic credit card payment
internal void AutoRepay()
{
Console.WriteLine("\nCREDIT CARD REPAYING...");
balance -= debt;
debt = 0;
Console.WriteLine("Today is Due Day({0}):\n Repayment: {1}\n Credit Card Balance: {2}", DateTime.Today.Day, debt, balance);
}
// Credit card deposit
internal void TopUp()
{
TopUp(ref balance);
Display();
}
// Credit card withdrawal
internal void Withdraw()
{
Withdraw(ref balance);
Display();
}
// Enable/cancel the automatic repayment service
internal void AutoRepayService(Client client, Delegate repayDelegate)
{
Console.WriteLine("Do You Want to Subscribe Auto Repay Service? \nY for Yes, N for No.\nPLEASE ENTER: ");
string choice = Console.ReadLine();
if (choice == "Y")
{
// Subscribe event AutoRepay, register method accounts for delegate methods.AutoRepay, whose signature needs to be the same as RepaymentDelegate
repayDelegate.AutoRepay += new Delegate.RepaymentDelegate(client.accounts.AutoRepay);
Console.WriteLine("-SERVICE SUBSCRIBED! -");
}
else if(choice == "N")
{
// Unsubscribe
repayDelegate.AutoRepay -= new Delegate.RepaymentDelegate(client.accounts.AutoRepay);
Console.WriteLine("-SERVICE UNSUBSCRIBED! -"); }}}Copy the codeMenu class
/ / menu
class Menu
{
// Accept and determine whether the options entered by the user are valid
internal int GetChoice(int lower, int upper)
{
int choice;
do
{
Console.WriteLine("PLEASE ENTER YOUR CHOICE: ");
choice = int.Parse(Console.ReadLine());
} while (choice < lower || choice > upper);
Console.WriteLine("-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -");
return choice;
}
/ / the main menu
internal void HomePage(Client client, Delegate repayDelegate)
{
int choice;
Console.WriteLine("Hello {0}, what can we help you with? \n", client.name);
Console.WriteLine(" (1) Accounts Status\n");// Account information and repayment status overview, such as subscribing to automatic repayment service, automatic repayment will be triggered on the repayment date
Console.WriteLine(" (2) Deposit Card\n");/ / cash card
Console.WriteLine(" (3) Credit Card\n");/ / credit card
Console.WriteLine(" (0) EXIT\n");// Exit the program
choice = GetChoice(0.3);
switch (choice)
{
case 1:
client.accounts.Display(client, repayDelegate);
break;
case 2:
DepoMenu(client, repayDelegate);
break;
case 3:
CretMenu(client, repayDelegate);
break;
case 0:
Application.Exit();
break;
}
Console.WriteLine("-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -");
Console.WriteLine("PRESS ANY KEY TO CONTINUE... ");
Console.ReadKey(true);
HomePage(client, repayDelegate);
}
// Debit card menu
internal void DepoMenu(Client client, Delegate repayDelegate)
{
int choice;
Console.WriteLine("\n------Deposit Card------\n");
Console.WriteLine(" (1) Status\n");// Debit card information
Console.WriteLine(" (2) Top-up\n");// Deposit card
Console.WriteLine(" (3) Withdraw\n");// Debit card for withdrawal
Console.WriteLine(" (0) BACK\n");// Return to the previous page
choice = GetChoice(0.3);
switch (choice)
{
case 1:
client.accounts.depo.Display();
break;
case 2:
client.accounts.depo.TopUp();
break;
case 3:
client.accounts.depo.Withdraw();
break;
case 0:
HomePage(client, repayDelegate);
break;
}
Console.WriteLine("-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -");
Console.WriteLine("PRESS ANY KEY TO CONTINUE... ");
Console.ReadKey(true);
Console.WriteLine("-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -");
DepoMenu(client, repayDelegate);
}
// Credit card menu
internal void CretMenu(Client client, Delegate repayDelegate)
{
int choice;
Console.WriteLine("\n------Credit Card------\n");
Console.WriteLine(" (1) Status\n");// Credit card information
Console.WriteLine(" (2) Top-up\n");// Credit card deposit
Console.WriteLine(" (3) Withdraw\n");// Credit card withdrawal
Console.WriteLine(" (4) Set Statement\n");// Set credit card payment date
Console.WriteLine(" (5) Loan\n");// Credit card loan
Console.WriteLine(" (6) Auto Repay Service\n");// Enable/cancel the automatic repayment service
Console.WriteLine(" (7) Manual Repay\n");// Pay by hand
Console.WriteLine(" (0) BACK\n");// Return to the previous page
choice = GetChoice(0.7);
switch (choice)
{
case 1:
client.accounts.cred.Display();
break;
case 2:
client.accounts.cred.TopUp();
break;
case 3:
client.accounts.cred.Withdraw();
break;
case 4:
client.accounts.cred.SetStatement();
break;
case 5:
client.accounts.cred.Loan();
break;
case 6:
client.accounts.cred.AutoRepayService(client,repayDelegate);
break;
case 7:
client.accounts.AutoRepay(client);
break;
case 0:
HomePage(client, repayDelegate);
break;
}
Console.WriteLine("-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -");
Console.WriteLine("PRESS ANY KEY TO CONTINUE... ");
Console.ReadKey(true);
Console.WriteLine("-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -"); CretMenu(client, repayDelegate); }}Copy the codeDelegate class
/ / the delegate class
class Delegate
{
// Define the delegate object RepaymentDelegate method, return type void, and take Client
internal delegate void RepaymentDelegate(Client client);
// Define events AutoRepay under the RepaymentDelegate delegate method
internal event RepaymentDelegate AutoRepay;
// Define the event handling method. The signature does not need to be the same as the RepaymentDelegate method
internal bool Repay(Client client)
{
// Trigger conditions, events AutoRepay is not empty, and that is the repay day
if(AutoRepay ! =null && DateTime.Today.Day == client.accounts.cred.statement)
{
// Trigger content
Console.WriteLine("AUTO REPAYMENT INITIATING ...");
// With the same name as the event and the same signature as the RepaymentDelegate delegate method
AutoRepay(client);
return true;
}
return false; }}Copy the codeThe main program
class Program
{
static void Main()
{
// Initialize user information
DepositCard depo = new DepositCard(10000);
CreditCard cred = new CreditCard(8.5000.100);
Accounts accounts = new Accounts(depo, cred);
Client client = new Client("Hazel", accounts);
// Delegate class instantiation
Delegate repayDelegate = new Delegate();
// Enter the menu
Menu menu = newMenu(); menu.HomePage(client, repayDelegate); }}Copy the codeA functional test
The test case
User name: Hazel Deposit card Initial amount: 10000 Credit card initial amount: 100 Credit card initial debt: 5000 Credit card initial repayment date: 8Copy the code1 Account Information overview
1.1 The repayment date is not reached
1.2.1 Repayment Date – Not subscribed to automatic repayment service
1.2.2 Repayment Date – Subscribe to automatic repayment service
1.3 late
1.4 no arrears
2 bank card functions – onlyThe credit cardAs an example
2.1 Display of bank card information
2.2 Bank Card Deposit
2.3 Bank Card Withdrawal
2.4 Set credit card repayment date
2.5 Credit Card Loans
2.6 Credit Card automatic repayment service is enabled/cancelled
See 1.2.2 for results after triggering
2.7 Manual credit card repayment
tips
Through this assignment, the differences and connections between Event and Dalegate are clarified: Event and Dalegate must be declared as public; Dalegate is a type that corresponds to a pointer to a function. The signature (return value and parameter) of the registered/unregistered function must match the defined delegate method. An Event is an object that is generated based on a Dalegate and cannot be assigned with “=” or called directly from outside the class.
As a banking system, there is a lack of security.
Repository
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