in reply to (Golf) Giving Change

Assuming that your lowest denomination >= 0.000001, you can get around the scaling in your code using sprintf (94 chars here):
sub c{($t,$p,@r)=@_;while($v=pop@$p and$t>0) {while($t>=$v){push@r,$v;$t=sprintf"%f",$t-$v}}@r}

update: added reinit of @r, comment about limits on smallest denomination (change %f to "%9f" for 1e-9 limit), change %g to %f
Works for larger numbers:
print join(',',c(22500020,[.01,.05,.1,1,2,5,10,20,50,100,1e3,1e4,1e5,1e6])); 1000000,1000000,1000000,1000000,1000000,1000000,1000000, 1000000,1000000,1000000,1000000,1000000,1000000,1000000, 1000000,1000000,1000000,1000000,1000000,1000000,1000000, 1000000,100000,100000,100000,100000,100000,20

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Re^2: (Golf) Giving Change
by tadman (Prior) on Jun 12, 2001 at 05:04 UTC
    In the process of your function, you consume the array given to you. If this were a fixed array provided by reference, you would trash it, rendering it useless for subsequent operations. Penalty is 7 characters:      @p=@$p; Further, I don't know of any currencies which use millionths of a unit, so why 1e-9 is even relevant is beyond me. Yikes!
Re: Re: (Golf) Giving Change
by no_slogan (Deacon) on Jun 12, 2001 at 04:34 UTC
    You'll lose precision if $t has more than 6 digits.