The C program is an implementation of the 8-Queens Puzzle, a classic problem in chess. The objective of the puzzle is to place eight chess queens on an 8×8 chessboard in such a way that no two queens threaten each other. In chess, a queen can attack horizontally, vertically, and diagonally.

Here’s a brief overview of how the program works:

  1. Initialization: The program initializes the SDL graphics library and TTF (TrueType Font) for text rendering.
  2. Graphics Setup: It creates a window and renderer for graphics rendering.
  3. User Input: The user is prompted to choose whether they want to manually input the coordinates of the first queen or let the computer explore all possible cases.
  4. Queen Placement: The program then uses backtracking to find solutions to the 8-Queens Puzzle. It iteratively places queens on the chessboard, checking if the current placement is valid.
  5. Graphics Display: When a valid placement is found, the program displays the chessboard with queens using SDL graphics. It shows the positions of queens, a counter for the number of solutions found, and the current placement coordinates.
  6. Delay and Clear: The program introduces a delay and clears the graphics before proceeding to the next solution.
  7. User Interaction: The user can interact with the program by closing the window or letting the computer explore all possibilities.
  8. Cleanup: After the program finishes, it closes the graphics window and frees allocated resources.

Please note that the use of SDL and graphics libraries is for visualization purposes, allowing you to see the solutions on a graphical chessboard. The core logic of the 8-Queens Puzzle is implemented in the queen function, which uses backtracking to find valid queen placements.