Smart Inventory Billing System

A console-based inventory management and billing application developed in C, designed to demonstrate core programming concepts like Structures, Pointers, Dynamic Memory Allocation, and Conditional Logic.

Features

This system provides a full-cycle solution for inventory management, stock updates, and sales transactions:

• Dynamic Inventory Allocation: Uses malloc for dynamic memory allocation.
• Inventory Management: Displays current stock, including product code, name, price, and quantity.
• Search & Update: Users can search and modify product details (price or stock) by its unique code.
• Sales Transactions: Allows for multi-item billing in a single session.
• Stock Validation: Prevents sales if the requested quantity exceeds the available stock.
• Conditional Discounts: Automatically applies discounts based on the quantity purchased:
  • 5% Discount: For quantities of 5 or more.
  • 10% Discount: For quantities of 10 or more.
• Final Bill Generation: Calculates and displays a detailed receipt, including Gross Total, Discounts, Net Subtotal, GST (18% Tax), and the Final Amount Due.

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Technologies Used

• Language: C
• IDE: VS CODE
• Compiler: MinGW
• Core Concepts: Structures, Pointers, Dynamic Arrays, Modular Programming (using .c and .h files).

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Installation and Setup

This project is built using modular programming, split across several source files (.c), which requires a C compiler (like GCC) to link them together into a single executable program.

Prerequisites

You must have the GCC (GNU Compiler Collection) installed on your system.

Compilation

1. Place all the project files (core.c, main.c, search.c, transaction.c, and project.h) into the same folder.

2. Open your Terminal or Command Prompt and navigate to the project directory.

3. Run the following command to compile and link the files:

   gcc core.c main.c search.c transaction.c -o program.exe

   • This command creates the executable file named program.exe.
   • Note: The header file (project.h) is included in the source files, not in the compilation command.

Running the Program

Execute the compiled program from your terminal:

./program.exe

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Usage Guide

Upon starting, you'll be prompted to enter the initial number of products, followed by their details (Code, Name, Price, Stock).

The main menu will then appear for operations:

Menu Option	Description
1. View Current Inventory Stock	Displays a formatted table of all products.
2. Search for a Product	Finds and displays details using its unique code.
3. Modify Product Details	Allows updating the unit price or adding stock.
4. Start New Billing Transaction	Begins the multi-item sales process.
5. Finalize Bill and Exit System	Calculates the final bill, prints the receipt, and terminates the program.

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Contribution

If you find an issue or have suggestions for improvement, please open an issue or submit a pull request.

License

This project is for educational purposes only.