Solution Source Code

Code Overview

1. Header Files and Namespace:

• <iostream> is included for input and output operations.
• using namespace std; allows the use of standard functions without prefixing them with std::.

2. User Input Function (ReadPinCode)

• Prompts the user to enter a PIN code.
• Reads and returns the entered PIN code.

3. Authentication Function (Login)

• Uses a do-while loop to allow a maximum of 3 attempts.
• If the correct PIN (1234) is entered, it returns true (successful login).
• If the wrong PIN is entered:
  • The remaining attempts are displayed.
  • The user can retry up to 3 times.
• If the user fails all 3 attempts, it returns false (access blocked).

4. Program Execution (main())

• Calls Login() to authenticate the user.
• If login is successful:
  • Changes console text to green (system("color 2F") for Windows).
  • Displays the account balance (7500).
• If login fails after 3 attempts:
  • Changes console text to red (system("color 4F") for Windows).
  • Displays a message indicating that the card is blocked.
• Returns 0 to indicate successful execution.