Mini_Projects_using_C++

Mini Projects Using C++

1. ATM MACHINE
2. DIGITAL CLOCK

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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.