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My ATM Project in C#

ATM Functions

• Withdraw Money
• Deposit Money
• Check Balance

Bank Users

• First Name
• Last Name
• Card Number
• PIN
• Account Balance

This C# code is part of a simple ATM machine simulation. It starts by defining a list of cardHolder objects, each representing a bank account with a card number, pin, first name, last name, and balance.

The Main method begins by initializing a list of cardHolder objects, cardHolders, and populating it with four card holders. Each card holder is created using the cardHolder constructor, which takes five arguments: card number, pin, first name, last name, and balance.

The program then prints a welcome message and prompts the user to enter their card number.

After the Main method, a debitCardNum string and a currentUser object of type cardHolder are declared. These will be used to store the user's input and the corresponding cardHolder object, respectively.

The program then enters an infinite loop, which will continue until a valid card number is entered. Inside the loop, the program attempts to read a line of input from the console, which is expected to be the user's card number. It then tries to find a cardHolder in the cardHolders list whose cardNum matches the entered card number using the FirstOrDefault method. If a match is found, the corresponding cardHolder object is assigned to currentUser and the loop is broken. If no match is found, an error message is printed and the loop continues.

If an exception occurs during this process (for example, if the user's input cannot be read), the program catches the exception and prints an error message, then continues with the next iteration of the loop.

After a valid card number has been entered, the program prompts the user to enter their pin. It then initializes a variable userPin to store this pin, and enters another infinite loop, presumably to validate the pin in a similar manner to the card number. However, the code for this part of the process is not shown in the provided excerpt.