A simple game of skill, implemented in Racket and C#
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#lang racket | |
;; Author: Torbjørn Marø | |
;; Inspired by Peter Sessions REVERSE game | |
;; as published in 'BASIC Computer Games' (1978) | |
;; http://www.atariarchives.org/basicgames/showpage.php?page=135 | |
(displayln "Welcome to REVERSE -- A Game of Skill! ") | |
(newline) | |
(displayln "To win, all you have to do is arrange a list ") | |
(displayln "of numbers (1 through 9) in numberical order ") | |
(displayln "from left to right. To move, you tell me how ") | |
(displayln "many numbers (counted from the left) to reverse. ") | |
(newline) | |
(displayln "No doubt you will like this game, but if you want ") | |
(displayln "to quit, reverse 0 (zero). ") | |
(newline) | |
(define (slice list index count) | |
(take (drop list index) count)) | |
(define (reverse-slice list index count) | |
(append (slice list 0 index) | |
(reverse (slice list index count)) | |
(slice list | |
(+ index count) | |
(- (length list) index count)))) | |
(define (new-game-list) | |
(shuffle (range 1 10))) | |
(define (prompt-choice) | |
(display "How many shall I reverse? ") | |
(let ([input (read)]) | |
(if (and (integer? input) | |
(>= input 0) | |
(< input 10)) | |
input | |
(begin | |
(displayln "Please answer between 0 and 9!") | |
(prompt-choice))))) | |
(define done? | |
((curry equal?) '(1 2 3 4 5 6 7 8 9))) | |
(define (print-game list) | |
(newline) | |
(for ([n list]) | |
(printf " ~a" n)) | |
(newline) | |
(newline)) | |
(displayln "Here we go ... the list is: ") | |
(define (run-game moves game) | |
(let ([choice (prompt-choice)]) | |
(if (zero? choice) | |
(displayln "O.K. Bye Bye!") | |
(let ([game (reverse-slice game 0 choice)]) | |
(print-game game) | |
(if (done? game) | |
(printf "You won it in ~a moves!" moves) | |
(run-game (add1 moves) game)))))) | |
(let ([game (new-game-list)]) | |
(print-game game) | |
(run-game 1 game)) |
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using System; | |
using System.Collections.Generic; | |
using System.Linq; | |
namespace ConsoleApplication3 | |
{ | |
/** | |
* This is basically the same thing implemented in C# | |
* as a reference. Both implementations will appear | |
* in a post on my blog. | |
**/ | |
class Program | |
{ | |
static List<int> NewGameList() | |
{ | |
return Enumerable | |
.Range(1, 9) | |
.OrderBy( _ => Guid.NewGuid() ) | |
.ToList(); | |
} | |
static int PromptChoice() | |
{ | |
Console.Write("Hom many shall I reverse? "); | |
int result; | |
if (int.TryParse(Console.ReadLine(), out result) | |
&& result >= 0 && result < 10) | |
{ | |
return result; | |
} | |
Console.WriteLine("Answer between 0 and 9, please try again!"); | |
return PromptChoice(); | |
} | |
static bool Done(List<int> list) | |
{ | |
for (int i = 0; i < list.Count; i++) | |
if (list[i] != i + 1) | |
return false; | |
return list.Count == 9; | |
} | |
static void PrintGame(List<int> list) | |
{ | |
Console.WriteLine(); | |
foreach (var item in list) | |
Console.Write(" " + item); | |
Console.WriteLine("\n"); | |
} | |
static void RunGame(int moves, List<int> game) | |
{ | |
int choice = PromptChoice(); | |
if (choice == 0) | |
{ | |
Console.WriteLine("O.K. Bye Bye!"); | |
return; | |
} | |
game.Reverse(0, choice); | |
PrintGame(game); | |
if (Done(game)) | |
{ | |
Console.WriteLine("You won it in {0} moves!", moves); | |
return; | |
} | |
RunGame(moves + 1, game); | |
} | |
static void Main(string[] args) | |
{ | |
Console.WriteLine( | |
"Welcome to REVERSE -- A Game of Skill!\n\n" + | |
"To win, all you have to do is arrange a list\n" + | |
"of numbers (1 through 9) in numberical order\n" + | |
"from left to right. To move, you tell me how\n" + | |
"many numbers (counted from the left) to reverse.\n\n" + | |
"No doubt you will like this game, but if you want\n" + | |
"to quit, reverse 0 (zero).\n\n" + | |
"Here we go ... the list is:"); | |
var game = NewGameList(); | |
PrintGame(game); | |
RunGame(1, game); | |
} | |
} | |
} |
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