94 lines
2.5 KiB
Nim
94 lines
2.5 KiB
Nim
import random, strformat, strutils
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type
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Bit = range[0..1]
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Board = array[3, array[3, Bit]]
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#---------------------------------------------------------------------------------------------------
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func flipRow(board: var Board; row: int) =
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for cell in board[row].mitems:
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cell = 1 - cell
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#---------------------------------------------------------------------------------------------------
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func flipCol(board: var Board; col: int) =
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for row in board.mitems:
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row[col] = 1 - row[col]
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#---------------------------------------------------------------------------------------------------
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proc initBoard(target: Board): Board =
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# Starting from the target we make 9 random row or column flips.
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result = target
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for _ in 1..9:
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if rand(1) == 0:
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result.flipRow(rand(2))
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else:
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result.flipCol(rand(2))
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#---------------------------------------------------------------------------------------------------
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proc print(board: Board; label: string) =
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echo &"{label}:"
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echo " | a b c"
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echo "---------"
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for r, row in board:
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stdout.write &"{r + 1} |"
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for cell in row: stdout.write &" {cell}"
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echo ""
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echo ""
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#———————————————————————————————————————————————————————————————————————————————————————————————————
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var target, board: Board
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randomize()
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# Initialize target.
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for row in target.mitems:
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for cell in row.mitems:
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cell = rand(1)
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# Initialize board and ensure it differs from the target i.e. game not already over!
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while true:
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board = initBoard(target)
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if board != target:
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break
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target.print("TARGET")
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board.print("OPENING BOARD")
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var flips = 0
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while board != target:
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# Get input from player.
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var isRow = true
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var n = -1
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while n < 0:
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stdout.write "Enter row number or column letter to be flipped: "
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stdout.flushFile()
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let input = stdin.readLine()
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let ch = if input.len > 0: input[0].toLowerAscii else: '0'
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if ch notin "123abc":
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echo "Must be 1, 2, 3, a, b or c"
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continue
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if ch in '1'..'3':
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n = ord(ch) - ord('1')
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else:
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isRow = false
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n = ord(ch) - ord('a')
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# Update board.
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inc flips
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if isRow: board.flipRow(n) else: board.flipCol(n)
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target.print("\nTARGET")
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let plural = if flips == 1: "" else: "S"
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board.print(&"BOARD AFTER {flips} FLIP{plural}")
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let plural = if flips == 1: "" else: "s"
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echo &"You’ve succeeded in {flips} flip{plural}"
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