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Mini_Projects_using_C++

Mini Projects Using C++

  1. ATM MACHINE
  2. DIGITAL CLOCK

Modern ATM & Digital Clock Applications

This repository contains two C++ applications: a feature-rich ATM simulation system and a real-time digital clock. Both applications demonstrate various C++ programming concepts and provide interactive user interfaces.

1. Modern ATM System

Overview

The ATM simulation system is a comprehensive console-based application that mimics real ATM functionality with advanced security features and user-friendly interface.

Key Features

  • 🔐 Secure PIN authentication system
  • 💰 Multiple transaction types
  • 📝 Transaction history tracking
  • ⚡ Fast cash options
  • 🔒 Account security with lockout mechanism
  • 💳 Multi-bank support

Technical Implementation

Core Components

  1. Account Structure

    • Stores user data including:
      • Card number
      • PIN
      • Balance
      • Bank name
      • Account holder name
      • Transaction history
      • Security-related fields (failed attempts, lock status)

  2. ATM Class

    class ATM {
    private:
        map<char, Account> accounts;
        const int MAX_FAILED_ATTEMPTS = 3;
        const int LOCK_DURATION_MINUTES = 60;
        // ... private methods
    public:
        // ... public interface
};

Security Features

  • PIN validation with retry limits
  • Account lockout system (60-minute lockout after 3 failed attempts)
  • Transaction logging with timestamps
  • Masked card number display

Available Operations

  1. Withdraw Money

    • PIN verification
    • Balance verification
    • Transaction logging

  2. Balance Check

    • Secure balance display
    • Transaction logging

  3. Transaction History

    • Chronological list of transactions
    • Timestamp-based logging

  4. Fast Cash

    • Preset withdrawal amounts
    • Quick access to common denominations

  5. PIN Change

    • Current PIN verification
    • New PIN confirmation
    • Length validation

Usage

# Compile the ATM application
g++ ATM_MACHINE.cpp -o atm

# Run the application
./atm

# Available test accounts:
- Card 'k': PIN 1234 (SBI Bank)
- Card 's': PIN 5678 (HDFC Bank)
- Card 'l': PIN 9123 (ICICI Bank)
- Card 'i': PIN 4567 (AXIS Bank)
- Card 'n': PIN 8912 (PNB Bank)

2. Digital Clock

Overview

A real-time digital clock application that displays the current time and date with format switching capabilities.

Key Features

  • ⏰ Real-time updates
  • 📅 Date display
  • 🔄 12/24 hour format toggle
  • 🖥️ Clean console interface

Technical Implementation

Core Components

  1. DigitalClock Class 
    class DigitalClock {
    private:
        bool is24HourFormat;
        bool isRunning;
        // ... private methods
    public:
        DigitalClock();
        void run();
};

Key Functions

  1. Time Display

    • Uses chrono and ctime for accurate time management
    • Formats time and date with proper padding
    • Updates every second

  2. Format Toggle

    • Switches between 12/24 hour format
    • Handles AM/PM indication
    • Maintains time accuracy during format changes

  3. User Interface

    • Clear screen implementation for different platforms
    • Non-blocking input handling
    • Continuous display updates

Usage

# Compile the Digital Clock application
g++ DIGITAL_CLOCK.cpp -o clock

# Run the application
./clock

# Controls:
- Press 'F' to toggle between 12/24 hour format
- Press 'Q' to quit the application

Technical Dependencies

Both applications require:

  • C++11 or higher
  • Standard C++ libraries
  • A C++ compiler (g++ recommended)

Common Libraries Used

  • <iostream> - For input/output operations
  • <string> - String manipulation
  • <chrono> - Time management
  • <thread> - Threading operations
  • <iomanip> - Output formatting

Building and Running

Prerequisites

  • C++ compiler (g++ recommended)
  • Make (optional)

Compilation Commands

# ATM System
g++ ATM_MACHINE.cpp -o atm -std=c++11

# Digital Clock
g++ DIGITAL_CLOCK.cpp -o clock -std=c++11

Code Structure

ATM System

  • Modular class design
  • Separation of concerns between UI and business logic
  • Robust error handling
  • Transaction logging system

Digital Clock

  • Single-responsibility principle
  • Non-blocking input handling
  • Platform-independent screen clearing
  • Real-time updates

Contributing

Feel free to fork this repository and submit pull requests. You can also open issues for bugs or feature requests.