class Program
{
static void Main(string[] args)
{
int[] numbers = new int[5];
Console.WriteLine(“Please enter 5 numbers:”);

for (int i = 0; i < 5; i++) { Console.Write($"Number {i + 1}: "); numbers[i] = Convert.ToInt32(Console.ReadLine()); } double average = CalculateAverage(numbers); Console.WriteLine($"The average is: {average}"); const double threshold = 50; if (average > threshold)
{
Console.WriteLine(“The average is above the threshold of 50.”);
}
else
{
Console.WriteLine(“The average is below the threshold of 50.”);
}
}

static double CalculateAverage(int[] numbers)
{
int sum = 0;
for (int i = 0; i < numbers.Length; i++) { sum += numbers[i]; } return (double)sum / numbers.Length; } }

class BankAccount {
public string AccountHolder { get; private set; }
public decimal Balance { get; private set; }

public BankAccount(string accountHolder) {
AccountHolder = accountHolder;
Balance = 0;
}

public void Deposit(decimal amount) {
if (amount > 0) {
Balance += amount;
Console.WriteLine($”Deposited: {amount:C}. New Balance: {Balance:C}”);
} else {
Console.WriteLine(“Deposit amount must be positive.”);
}
}

public void Withdraw(decimal amount) {
if (amount <= 0) { Console.WriteLine("Withdrawal amount must be positive."); } else if (amount > Balance) {
Console.WriteLine(“Insufficient funds for this withdrawal.”);
} else {
Balance -= amount;
Console.WriteLine($”Withdrew: {amount:C}. New Balance: {Balance:C}”);
}
}

public void CheckBalance() {
Console.WriteLine($”Current Balance: {Balance:C}”);
}
}

class Program {
private static Dictionary accounts = new Dictionary();

static void Main() {
while (true) {
Console.WriteLine(“Welcome to the Simple Banking System”);
Console.WriteLine(“1. Create Account”);
Console.WriteLine(“2. Deposit Money”);
Console.WriteLine(“3. Withdraw Money”);
Console.WriteLine(“4. Check Balance”);
Console.WriteLine(“5. Exit”);
Console.Write(“Select an option: “);
string option = Console.ReadLine();

switch (option) {
case “1”:
CreateAccount();
break;
case “2”:
DepositMoney();
break;
case “3”:
WithdrawMoney();
break;
case “4”:
CheckBalance();
break;
case “5”:
return;
default:
Console.WriteLine(“Invalid option, please try again.”);
break;
}
}
}

static void CreateAccount() {
Console.Write(“Enter account holder’s name: “);
string name = Console.ReadLine();
if (!accounts.ContainsKey(name)) {
accounts[name] = new BankAccount(name);
Console.WriteLine(“Account created successfully.”);
} else {
Console.WriteLine(“Account already exists.”);
}
}

static void DepositMoney() {
Console.Write(“Enter account holder’s name: “);
string name = Console.ReadLine();
if (accounts.ContainsKey(name)) {
Console.Write(“Enter amount to deposit: “);
if (decimal.TryParse(Console.ReadLine(), out decimal amount)) {
accounts[name].Deposit(amount);
} else {
Console.WriteLine(“Invalid amount.”);
}
} else {
Console.WriteLine(“Account not found.”);
}
}

static void WithdrawMoney() {
Console.Write(“Enter account holder’s name: “);
string name = Console.ReadLine();
if (accounts.ContainsKey(name)) {
Console.Write(“Enter amount to withdraw: “);
if (decimal.TryParse(Console.ReadLine(), out decimal amount)) {
accounts[name].Withdraw(amount);
} else {
Console.WriteLine(“Invalid amount.”);
}
} else {
Console.WriteLine(“Account not found.”);
}
}

static void CheckBalance() {
Console.Write(“Enter account holder’s name: “);
string name = Console.ReadLine();
if (accounts.ContainsKey(name)) {
accounts[name].CheckBalance();
} else {
Console.WriteLine(“Account not found.”);
}
}
}