99 Bottles of Beer

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Language Maple 11

Date:	06/21/07
Author:	Stefan Vorkoetter
URL:	http://www.stefanv.com
Comments:	0
Info:	http://www.maplesoft.com
Score:	(2.96 in 94 votes)

module Sing()
    local initialSize, what, where, bottles, action, ModuleApply;

    bottles := proc( n::integer, { lowercase::truefalse := false } )
	option remember;
	if n < 0 then
	    bottles(initialSize)
        elif n = 0 then
	    if lowercase then
		StringTools:-LowerCase(procname(n))
	    else
		"No more bottles"
	    fi
	elif n = 1 then
	    "1 bottle"
	else
	    "" || n || " bottles"
	fi
    end;

    action := proc( n::integer )
        if n = 0 then
	    "Go to the store and buy some more"
	else
	    "Take one down and pass it around"
	fi
    end;

    what := " of beer";
    where := " on the wall";

    ModuleApply := proc( packSize::integer := 99 )
        local n;
	initialSize := packSize;
	for n from initialSize to 0 by -1 do
	    printf("%s%s%s, %s%s.\n",
	    	   bottles(n),what,where,bottles(n,lowercase),what);
	    printf("%s, %s%s%s.\n",action(n),bottles(n-1,lowercase),what,where);
	    if n > 0 then
	        printf("\n")
	    fi
	od
    end
end;

Sing();

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