Shell Script Poker Game Post: 302142394

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Top Forums Shell Programming and Scripting Shell Script Poker Game Post 302142394 by cfajohnson on Friday 26th of October 2007 12:57:49 AM

10-26-2007

Registered User

I'd simplify the whole thing by shuffling the deck and then dealing from it.

There are 3 functions in this snippet:

shuffle, which shuffles a standard deck of cards into a space-separated string of 52 cards, $Deck

_deal, which takes an optional argument of the number of cards to be dealt; it defaults to 1 if no number is supplied. The result is a space-separated string stored in $_DEAL; nothing is printed

deal, which calls _deal and prints the contents of $_DEAL, one card to a line

Code:

shuffle() #@ USAGE: shuffle
{ #@ TODO: add options for multiple or partial decks
 Deck=$(
   printf "%s\n" {1,2,3,4,5,6,7,8,9,J,Q,K,A}_{Hearts,Spades,Diamonds,Clubs} |
    awk '## Seed the random number generator
         BEGIN { srand() }

         ## Put a random number in front of each line
         { printf "%.0f\t%s\n", rand() * 99999, $0 }
    ' |
     sort -n |  ## Sort the lines numerically
      cut -f2  ## Remove the random numbers
  )
}

_deal() #@ USAGE: _deal [N] -- where N is no. of cards; defaults to 1
{       #@ RESULT: stored in $_DEAL
    local num=${1:-1}
    set -- $Deck
    _DEAL=${@:1:$num}
    shift "$num"
    cards_remaining=$#
    Deck=$*
}

deal() #@ USAGE: deal [N]
{      #@ RESULT: cards printed one to a line
    _deal "$@"
    printf "%s\n" $_DEAL
}

## Sample run
shuffle
deal 2
echo
deal 3
echo
deal

Sample output from above script:

Code:

K_Hearts
A_Clubs

3_Clubs
6_Clubs
2_Hearts

5_Clubs

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LEARN ABOUT SUNOS

srand

rand(3UCB)					     SunOS/BSD Compatibility Library Functions						rand(3UCB)

NAME

       rand, srand - simple random number generator

SYNOPSIS

       /usr/ucb/cc[ flag ... ] file ...
       int rand()

       int srand( seed);
       unsigned seed;

DESCRIPTION

       rand() uses a multiplicative congruential random number generator with period 2**32 to return successive pseudo-random numbers in the range
       from 0 to "2**31 -1."

       srand() can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a
       value of 1.

SEE ALSO

       drand48(3C), rand(3C), random(3C)

NOTES

       Use of these interfaces should be restricted to only applications written on BSD platforms.  Use of these interfaces with any of the system
       libraries or in multi-thread applications is unsupported.

       The spectral properties of rand() leave a great deal to be desired. drand48(3C) and random(3C) provide much better, though more	elaborate,
       random-number generators.

       The low bits of the numbers generated are not very random; use the middle bits. In particular the lowest bit alternates between 0 and 1.

SunOS 5.10							    12 Feb 1993 							rand(3UCB)

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