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https://github.com/datmicw/30daylab___csharp

30 Days of C# Practice
https://github.com/datmicw/30daylab___csharp

algorithms csharp-code oop practice

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30 Days of C# Practice

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# 30 Days of C# Practice: OOP & Algorithms  



This repository contains **30 daily challenges** to practice Object-Oriented Programming (OOP) and algorithms in C#. Each challenge is designed to strengthen programming skills, logical thinking, and familiarity with C# features.  



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## **Project Structure**  



The project is divided into **30 folders**, one for each day. Each folder contains:  

1. The problem statement for the day's challenge.  

2. A C# solution (`.cs` file).  

3. Test cases for the challenge (if applicable).  



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## **Challenges Overview**  



### **Week 1: OOP Fundamentals**  

1. **Manage Contacts**: CRUD operations on a contact list.  

2. **Sort Products**: Bubble sort for product prices.  

3. **Banking System**: Deposit, withdraw, and transfer functionality.  

4. **Find Most Frequent Element**: Use a dictionary to count occurrences.  

5. **Manage Students**: Calculate and compare students' average scores.  

6. **Decode String**: Decode strings in a format like `3[a]2[bc]`.  

7. **User Login System**: Register and login functionality.  



### **Week 2: Intermediate OOP & Data Structures**  

8. **Shortest Path**: Implement Dijkstra's algorithm for a graph.  

9. **Number Guessing Game**: Simulate a number guessing game.  

10. **Printer Queue**: Simulate a print queue using the `Queue` collection.  

11. **Maze Solver**: Solve a maze using recursion or BFS.  

12. **Prime Numbers**: Find all primes up to a given number.  

13. **ATM Simulation**: Calculate the minimum number of bills for withdrawals.  

14. **Library Management**: Borrow and return books in a library system.  



### **Week 3: Advanced Algorithms**  

15. **Evaluate Postfix Expression**: Use a stack to evaluate postfix expressions.  

16. **Linked List Implementation**: Build a custom linked list with basic operations.  

17. **Check Palindrome**: Verify if a string is a palindrome.  

18. **Student Classification**: Group students into categories based on scores.  

19. **Fractions**: Add, subtract, multiply, and divide fractions.  

20. **Generate Combinations**: Use recursion to find all combinations in an array.  

21. **Spiral Matrix**: Print numbers in a spiral NxN matrix.  



### **Week 4: Real-World Applications**  

22. **Sudoku Solver**: Solve a Sudoku puzzle using backtracking.  

23. **Classroom Management**: Calculate class averages and find top students.  

24. **Sort by Number of Digits**: Sort numbers by the number of digits.  

25. **Convert Number to Words**: Convert integers into their word representations.  

26. **Generate Unique Random Numbers**: Create a list of unique random numbers.  

27. **Binary Tree Implementation**: Implement and traverse a binary tree.  

28. **Find Pairs with Sum X**: Identify pairs in an array that sum to X.  

29. **Pathfinding in a Matrix**: Find a valid path in a binary matrix using DFS/BFS.  

30. **Ticket Reservation System**: Manage ticket reservations and calculate revenue.  



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## **How to Run the Code**  



1. Clone the repository:  

   ```bash  

   git clone https://github.com/datmicw/30dayLAB___CSharp.git  

   ```  



2. Open the solution in Visual Studio or any C# IDE.  



3. Navigate to the folder of the day you want to test.  



4. Run the program and test it with the provided test cases.  



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## **Requirements**  



- **C# IDE**: Visual Studio

- **.NET Framework**: Version 8.0 or later  



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