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https://github.com/coding-horror/basic-computer-games.git
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101 lines
2.8 KiB
Plaintext
101 lines
2.8 KiB
Plaintext
print "Solitaire Checker Puzzle by David Ahl"
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print
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print "48 checkers are placed on the 2 outside spaces of a"
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print "standard 64-square checkerboard. The object is to"
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print "remove as many checkers as possible by diagonal jumps"
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print "(as in standard checkers). Use the numbered board to"
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print "indicate the square you wish to jump from and to. On"
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print "the board printed out on each turn '1' indicates a"
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print "checker and '0' an empty square. When you have no"
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print "possible jumps remaining, input a '0' in response to"
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print "question 'Jump from?'"
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print
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input "(Press Return.)"
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print
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pad4 = function(n)
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return (" " + n)[-4:]
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end function
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printBoard = function
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// Idea: This program could be greatly improved by printing the board
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// as the index numbers (1-64), indicating which of those positions
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// contain checkers via color or punctuation, e.g. "(42)" vs " 42 ".
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// This would make it much easier for the user to figure out what
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// numbers correspond to the positions they have in mind.
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print
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for j in range(1, 57, 8)
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print " " + board[j:j+8].join(" ")
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end for
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end function
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initBoard = function
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globals.board = [null] + [1] * 64 // treat this as 1-based array
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for j in range(19, 43, 8)
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for i in range(j, j+3)
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board[i] = 0
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end for
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end for
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end function
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isLegal = function(from, to)
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if board[from] == 0 then return false
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if board[to] == 1 then return false
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if board[(to+from)/2] == 0 then return false
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fromRow = floor((from-1) / 8) // row in range 0-7
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fromCol = from - fromRow*8 // column in range 1-8
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toRow = floor((to-1) / 8)
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toCol = to - toRow*8
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if fromRow > 7 or toRow > 7 or fromCol > 8 or toCol > 8 then return false
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if abs(fromRow-toRow) != 2 or abs(fromCol-toCol) != 2 then return false
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return true
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end function
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askYesNo = function(prompt)
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while true
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answer = input(prompt + "? ").lower
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if answer and answer[0] == "y" then return "yes"
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if answer and answer[0] == "n" then return "no"
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print "Please answer 'yes' or 'no'."
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end while
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end function
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print "Here is the numerical board:"
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print
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for j in range(1, 57, 8)
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print pad4(j) + pad4(j+1) + pad4(j+2) + pad4(j+3) +
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pad4(j+4) + pad4(j+5) + pad4(j+6) + pad4(j+7)
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end for
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while true
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initBoard
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print
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print "And here is the opening position of the checkers."
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printBoard
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jumps = 0
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while true
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fromPos = input("Jump from? ").val
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if fromPos == 0 then break
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toPos = input("To? ").val
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print
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if not isLegal(fromPos, toPos) then
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print "Illegal move. Try again..."
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continue
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end if
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board[fromPos] = 0
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board[toPos] = 1
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board[(toPos+fromPos)/2] = 0
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jumps += 1
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printBoard
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end while
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// End game summary
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sum = board[1:].sum
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print "You made " + jumps + " jumps and had " + sum + " pieces"
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print "remaining on the board."
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print
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if askYesNo("Try again") == "no" then break
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end while
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print
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print "O.K. Hope you had fun!!"
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