C++ Mini Projects

Welcome to the C++ Mini Projects repository! This is a collection of beginner-to-intermediate console-based applications built using modern C++. These projects are designed to demonstrate core object-oriented programming (OOP) concepts, data handling, and clean control flow structures.

Featured Projects

This repository contains three distinct mini-applications:

1. Banking System

A simulated console banking application that mimics real-world banking operations.

• Key Features:
  • Account creation with unique account numbers.
  • Secure deposit and withdrawal functionalities (with balance checks).
  • Balance inquiry and account detail display.
• Concepts Used: Classes and Objects

2. Calculator

A robust command-line calculator capable of handling basic arithmetic and standard algebraic operations.

• Key Features:
  • Basic operations: Addition, Subtraction, Multiplication, Division.
  • Continuous execution loop until the user decides to exit.
  • Division-by-zero error handling.
• Concepts Used: Functions, switch-case control blocks, Input validation.

3. Digital Clock

A console-based, 24-hour format digital clock written in C++ that allows users to set a custom starting time. The application continuously updates and displays the time in real-time (HH:MM:SS) using an infinite loop, built-in time delays, and automated screen clearing for a realistic ticking effect.

• Key Features
• Custom Start Time: Prompts the user to input the initial hours, minutes, and seconds.
• Input Validation: Ensures the entered time conforms to realistic 24-hour constraints.
• Dynamic UI:* Implements custom console coloring and clear-screen commands to simulate a live digital display.
• Concepts Used: Functions, control blocks, Input validation, I/O Manipulation, System and Time Management(Sleep(); system(cls); system("color");)

3. Restaurant Menu

An interactive digital menu calculator system.

• Key Features:
  • Basic operations: Addition, Subtraction, Multiplication, Division.

4. Registration Login Form

It provides a secure and user-friendly interface for managing user accounts, handling authentication, and recovering lost credentials seamlessly.

• Key Features:
• User Registration: Allows new users to create an account by securely storing their credentials.
• User Login: Authenticates existing users by verifying their username and password against stored records.
• Password Recovery (Forgot Password): Enables users to recover or reset their password using a search mechanism.
• Graceful Exit: Provides a clean termination option from the main menu.
• Concepts Used: File Handling (fstream, ifstream), function, Control Flow & Structures

5. Password Generator

A lightweight, console-based utility to generate customizable, secure passwords based on user-defined lengths and character constraints.

• Key Features:
  • Input: Enter the total password length, followed by the specific count of numbers and symbols you want.
  • Output: Instantly generates an interleaved, unpredictable string mixing alphabets, numbers, and symbols.
• Concepts Used: Procedural Programming, Functions with Default Arguments (num=0, symb=0), Pseudo-Random Number Generation (srand(), rand(), time()), String Manipulation & Interleaving, Standard I/O Streams (cin, cout), Control Flow (while loops, if conditionals)

7. System Security

A lightweight console-based authentication system that allows users to securely register a new profile, log in using their credentials, and update their existing passwords. It handles real-time user validation by reading and writing profile data to a local storage file.

• Key Features:

  • User Registration: Dynamically creates unique user profiles with a username, password, and age.
  • Secure Authentication: Validates login credentials against existing records before granting access.
  • Profile Verification: Displays account details upon a successful login.
  • Password Management: Allows users to safely change their password after verifying their old credentials.
  • Persistent Storage: Keeps user data intact even after closing the program.

• Concepts Used:

  • File Handling (ifstream, ofstream)
  • Object-Oriented Logic & Flow Control (switch-case, do-while loops)
  • Data Streams & Parsing (std::string, cin/cout)
  • Conditional Validation

Getting Started

Prerequisites

To compile and run these projects, you need a C++ compiler installed on your system:

• Windows: MinGW, MSVC, or CLion
• macOS: Xcode Command Line Tools (g++ / clang)
• Linux: GCC (GNU Compiler Collection)

Installation & Setup

1. Clone the repository:

   git clone https://github.com/dk132006/cpp-mini-projects.git
   cd cpp-mini-projects

2. Navigate to a specific project folder:

   cd "Banking System"

3. Compile the project: Using g++, run:

   g++ main.cpp -o main

4. Run the executable:

• On Windows: main.exe
• On Linux/macOS: ./main

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Technical Concepts Demonstrated

• Object-Oriented Programming (OOP): Encapsulation, inheritance, and abstraction.
• Data Persistence: Using file streams to save application states.
• Robust Input Validation: Preventing infinite loops or crashes from invalid user inputs (e.g., entering text into a numerical menu field).

📄 License

This project is licensed under the MIT License