chess_check

Arrays and matrices32

Objective

Given a square chess board passed as a single argument, decide whether the King is currently under attack by any other piece.

Steps

The program must receive exactly one argument: a square board whose rows are separated by newline characters.
Each cell is one of: K for the King (exactly one), P for a Pawn, R for a Rook, B for a Bishop, Q for a Queen, or . for an empty square.
A Pawn threatens the two squares diagonally above it (north-west and north-east).
A Rook threatens straight rank and file lines, stopping at the first non-empty square along each direction.
A Bishop threatens diagonal lines, stopping at the first non-empty square along each direction.
A Queen threatens both straight and diagonal lines, again stopping at the first non-empty square.
Print Success followed by a newline if at least one piece attacks the King. Otherwise print Fail followed by a newline.
If the argument count is not exactly two, or if the board does not contain a King, the program must print nothing.

examples

$ ./chess_check $'B....\n.....\n..K..\n.....\n.....'

Success

$ ./chess_check $'.....\n.....\n..K..\n.....\n.....'

Fail

Constraints

Expected files

chess_check.c

Allowed functions

write

Tests

Run the tests to grade your code

Build

01Missing board argument prints nothing

02Bishop attacks King along an open diagonal

03Rook attacks King down an open file

04Queen attacks King along an open rank

05Pawn threatens King from the south-east diagonal square

06Pawn blocks the Rook before it reaches the King

07Pawn on the diagonal blocks the Bishop

08King alone on an empty board is safe

09Board without a King produces no output

chess_check

Objective

Given a square chess board passed as a single argument, decide whether the King is currently under attack by any other piece.

Steps

The program must receive exactly one argument: a square board whose rows are separated by newline characters.
Each cell is one of: K for the King (exactly one), P for a Pawn, R for a Rook, B for a Bishop, Q for a Queen, or . for an empty square.
A Pawn threatens the two squares diagonally above it (north-west and north-east).
A Rook threatens straight rank and file lines, stopping at the first non-empty square along each direction.
A Bishop threatens diagonal lines, stopping at the first non-empty square along each direction.
A Queen threatens both straight and diagonal lines, again stopping at the first non-empty square.
Print Success followed by a newline if at least one piece attacks the King. Otherwise print Fail followed by a newline.
If the argument count is not exactly two, or if the board does not contain a King, the program must print nothing.

examples

$ ./chess_check $'B....\n.....\n..K..\n.....\n.....'

Success

$ ./chess_check $'.....\n.....\n..K..\n.....\n.....'

Fail

Constraints

Expected files

chess_check.c

Allowed functions

write

chess_check

Arrays and matrices32

Objective

Given a square chess board passed as a single argument, decide whether the King is currently under attack by any other piece.

Steps

The program must receive exactly one argument: a square board whose rows are separated by newline characters.
Each cell is one of: K for the King (exactly one), P for a Pawn, R for a Rook, B for a Bishop, Q for a Queen, or . for an empty square.
A Pawn threatens the two squares diagonally above it (north-west and north-east).
A Rook threatens straight rank and file lines, stopping at the first non-empty square along each direction.
A Bishop threatens diagonal lines, stopping at the first non-empty square along each direction.
A Queen threatens both straight and diagonal lines, again stopping at the first non-empty square.
Print Success followed by a newline if at least one piece attacks the King. Otherwise print Fail followed by a newline.
If the argument count is not exactly two, or if the board does not contain a King, the program must print nothing.

examples

$ ./chess_check $'B....\n.....\n..K..\n.....\n.....'

Success

$ ./chess_check $'.....\n.....\n..K..\n.....\n.....'

Fail

Constraints

Expected files

chess_check.c

Allowed functions

write

Tests

Run the tests to grade your code

Build

01Missing board argument prints nothing

02Bishop attacks King along an open diagonal

03Rook attacks King down an open file

04Queen attacks King along an open rank

05Pawn threatens King from the south-east diagonal square

06Pawn blocks the Rook before it reaches the King

07Pawn on the diagonal blocks the Bishop

08King alone on an empty board is safe

09Board without a King produces no output