66 lines
1.6 KiB
Factor
66 lines
1.6 KiB
Factor
USING: help.markup help.syntax math kernel arrays ;
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IN: 24-game
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HELP: 24-game
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{ $description "Starts the game!" }
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{ $examples
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{ $unchecked-example
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"USE: 24-game"
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"24-game"
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"{ 8 2 1 2 }\n"
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"Commands: { + - * / rot swap q }\n"
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"swap\n"
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"{ 8 2 2 1 }\n"
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"Commands: { + - * / rot swap q }\n"
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"-\n"
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"{ 8 2 1 }\n"
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"Commands: { + - * / rot swap q }\n"
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"+\n"
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"{ 8 3 }\n"
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"Commands: { + - * / swap q }\n"
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"*\n"
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"You WON!"
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}
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} ;
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HELP: make-24
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{ $values { "array" array } }
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{ $description
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"Produces a vector with 4 integers. With the following condition: "
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"If these integers were directly on the stack, one can process them into 24, "
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"just using the provided commands and the 4 numbers. The Following are the "
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"provided commands: "
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{ $link + } ", " { $link - } ", " { $link * } ", "
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{ $link / } ", " { $link swap } ", and " { $link rot } "."
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}
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{ $examples
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{ $example
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"USING: 24-game kernel sequences prettyprint ;"
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"make-24 length 4 = ."
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"t"
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}
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{ $notes { $link makes-24? } " is used in " { $link makes-24? } "." }
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} ;
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HELP: makes-24?
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{ $values
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{ "a" integer }
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{ "b" integer }
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{ "c" integer }
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{ "d" integer }
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{ "?" "a boolean" }
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}
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{ $description
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"Tells if it is possible to win 24-game with these integers."
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} ;
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ARTICLE: "24-game" "The Game of 24"
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"A classic math game, where one attempts to create 24, by applying "
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"arithmetical operations and some shuffle words to a stack of 4 numbers. "
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{ $subsections
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24-game
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make-24
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makes-24?
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} ;
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ABOUT: "24-game"
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