Part of the "Chess in C" blog post series. Checks whether a square has a rook in the row or column.

chessInCPart3-checkRowAndColumnForRook.c

    /* Calculate a rook move */
    /* Variables to store rook position of row 3 and column 4 */

    board[4][0] = ROOK;
    int pieceRow = 4;
    int pieceColumn = 0;

    /* For every row */
    for (i = 0;i <= 7; i++) {
        /* And every column */
        for (j = 0;j <= 7; j++){
            /* ...if the row contains the rook, mark the cell
             * as a possible destination
             *  (except if the cell contains the piece) */
             if (i == pieceRow && j != pieceColumn) {
                board[i][j] = BREADCRUMB;
            }
            /* ...if the column contains the rook, mark the cell
             *  as a possible destination
             *  (except if the cell contains the piece) */
            if (i != pieceRow && j == pieceColumn) {
               board[i][j] = BREADCRUMB;
            }
        }
    }