Supermarket Invoice Generator

A command-line based invoice generation and management system for supermarkets, developed in C.

Project Overview

This Supermarket Invoice Generator is a comprehensive system designed for cashiers to create, manage, search, and delete customer invoices. The application features a user-friendly interface with colored text output, typewriter effects, and structured invoice formatting.

Features

• Cashier Authentication: Secure login with ID verification
• Invoice Generation: Create detailed customer invoices with multiple items
• Invoice Management: View, search, and delete saved invoices
• Data Persistence: Store invoice data in binary files
• User-friendly Interface: Colored text output and typewriter effects
• Input Validation: Comprehensive error handling for all user inputs
• Time-based Shift Detection: Automatically detects cashier's shift based on system time

Screenshots

Main Interface

Functionalities

Invoice Manual Creation

Invoice Generation

Technologies Used

• Language: C
• Libraries:
  • stdio.h: Standard input/output operations
  • string.h: String manipulation functions
  • stdlib.h: Memory allocation, random numbers, etc.
  • ctype.h: Character type checking
  • time.h: Date and time functions
  • stdbool.h: Boolean data type
  • windows.h: Windows-specific functions (for console manipulation)
• Data Storage: Binary file I/O
• Build Environment: GCC compiler

Programming Concepts Implemented

Core C Programming Concepts

• Structured Programming: Modular code organization with functions
• Control Structures: if-else, switch-case, while, do-while, for loops
• Data Types: Primitive types (int, float, char) and derived types
• Operators: Arithmetic, relational, logical, and assignment operators
• Arrays: Single and multi-dimensional arrays for data storage
• Pointers: Memory address manipulation and dynamic memory allocation
• Functions: User-defined functions with various parameter passing methods
• File I/O: Binary file operations for data persistence

Advanced Programming Concepts

• Structures: Complex data types for organizing related data
• Nested Structures: Structures within structures for hierarchical data
• Dynamic Memory Management: Allocation and deallocation of memory
• String Manipulation: Advanced string handling and validation
• Error Handling: Input validation and graceful error recovery
• Time and Date Processing: Working with system time functions

Author

[Syed Fawwad Ahmed]

Acknowledgements

This project was developed as part of the "Fundamentals of Computer Programming" course.