Sudoku Solver in C

This project is a command-line Sudoku Solver written in C. It solves a standard 9x9 Sudoku puzzle using logical techniques. The puzzle is hard-coded in the source file, and the solution is displayed in the terminal.

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Features

• Automatic Sudoku Solver: Solves a predefined 9x9 Sudoku puzzle.
• Terminal-Based Output: Displays the puzzle before and after solving.
• Makefile Support: Compile and run the project easily using a Makefile.

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How It Works

1. The puzzle is defined in a 2D array in the source code.
2. The solver applies Sudoku-solving logic, checking:
   • Rows
   • Columns
   • 3x3 Boxes
3. If the puzzle is solvable, it prints the solution. If not, it notifies the user.

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Project Files

/sudokuSolver-C
|-- /include             # Header Files (.h)
    |-- sudoku.h         
|-- /src                 # source code (.c)
    |-- box.c
    |-- puzzle.c
    |-- row.c
    |-- square.c
    |-- sudoku.c
|-- makefile            # Build automation file
|-- README.md           # Project description (this file)

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Compilation & Execution

Using Makefile

Just type 'make' in your terminal and it will compile and make all the files in the src folder.

make

Manual Compilation (GCC)

Inside src folder.

gcc sudoku.c box.c row.c puzzle.c square.c -o sudoku
./sudoku

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Sample Output

Initial Puzzle:
-------------------------------
| 0  1  9 | 0  0  2 | 0  0  0 |
| 4  7  0 | 6  9  0 | 0  0  1 |
| 0  0  0 | 4  0  0 | 0  9  0 |
-------------------------------
| 8  9  4 | 5  0  7 | 0  0  0 |
| 0  0  0 | 0  0  0 | 0  0  0 |
| 0  0  0 | 2  0  1 | 9  5  8 |
-------------------------------
| 0  5  0 | 0  0  6 | 0  0  0 |
| 6  0  0 | 0  2  8 | 0  7  9 |
| 0  0  0 | 1  0  0 | 8  6  0 |
-------------------------------
Solved Puzzle:
-------------------------------
| 3  1  9 | 7  8  2 | 6  4  5 |
| 4  7  2 | 6  9  5 | 3  8  1 |
| 5  8  6 | 4  1  3 | 2  9  7 |
-------------------------------
| 8  9  4 | 5  3  7 | 1  2  6 |
| 1  2  5 | 8  6  9 | 7  3  4 |
| 7  6  3 | 2  4  1 | 9  5  8 |
-------------------------------
| 2  5  8 | 9  7  6 | 4  1  3 |
| 6  4  1 | 3  2  8 | 5  7  9 |
| 9  3  7 | 1  5  4 | 8  6  2 |
-------------------------------

Future Enhancements

• Allow user input for custom puzzles.
• Read puzzle from a file.
• Implement a graphical user interface (GUI).
• Add Puzzle Validation feature.

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Author

• Arnav Kirti - Developer

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Let me know if you'd like more adjustments! 🚀