A modular, console-based To-Do List application written in C. It helps users manage their tasks with features like authentication, categorization, task tracking, and file persistence.
This project offers a simple and structured way to manage daily tasks through a command-line interface. It's built with maintainability in mind, using a modular architecture (no header files), with each .c file focused on a specific functionality.
| File | Purpose |
|---|---|
main.c |
Main entry point; handles menus and program flow. |
auth.c |
Manages user authentication (signup/login). |
task_manager.c |
Core task operations: add, delete, mark as complete/incomplete. |
task_view.c |
Displays task lists and summary statistics. |
task_edit.c |
Provides task editing capabilities. |
task_persistence.c |
Handles saving/loading tasks to/from files for data persistence. |
gcc main.c auth.c task_manager.c task_view.c task_edit.c task_persistence.c -o todo
./todogcc main.c auth.c task_manager.c task_view.c task_edit.c task_persistence.c -o todo.exe
todo.exe- Sign up and log in securely with credentials.
- Add tasks with descriptions, categories, and priorities.
- Edit task details.
- Mark tasks as complete or incomplete.
- Delete tasks.
- View all tasks with status, category, and priority.
- Summary of completed vs. pending tasks.
- All data is saved to text files for continuity.
The app uses two plain text files for storing data:
users.txt– Stores credentials in the format:username password.tasks.txt– Stores task data in the format:description|category|priority|completed.
📂 These files are auto-generated in the app's directory on first use.
Welcome to the To-Do App!
1. Sign Up
2. Login
Choose: 1
Enter username: john
Enter password: *****
Successfully registered!
Main Menu:
1. Add Task
2. View Tasks
3. Edit Task
4. Delete Task
5. Mark Complete
6. Task Summary
7. Logout
This project demonstrates:
- Modular design in C programming.
- File handling using
fopen,fscanf,fprintf. - Simple user interface and menus.
- Structs, string manipulation, and control logic in a real-world scenario.
- 📆 Add due dates and reminders.
- 🔄 Sort tasks by priority, category, or date.
- 🌈 Add color-coded CLI output for better UX.
- 👥 Multi-user support with separate task lists.
This project is licensed under the MIT License.
Contributions are welcome! Fork the repository, make your changes, and submit a pull request. Let's build this better, together.