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Binary to Decimal (zdog's way)

by zdog (Priest)
on Aug 31, 2000 at 10:07 UTC ( #30478=snippet: print w/ replies, xml ) Need Help??

Description: I was playing around with the shift operator and I kept getting tired of converting binary to decimal. So I came up with this little program that I guess could be implemented different ways, but this is the way I like to use it.

After I wrote the program, I came to PerlMonks and saw that there was already a way to do this, obviously better, but I kind of feel proud of this script since I made it all on my own. So ...

#!/usr/bin/perl

# Implementation: perl *.pl BINARY_NUM

my @inputr = reverse split(//, shift);    
my $output = 0;
for (0 .. @inputr-1) { $output += ($inputr[$_] * (2**$_)); }
print "$output\n";
Comment on Binary to Decimal (zdog's way)
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RE: Binary to Decimal (zdog's way)
by merlyn (Sage) on Aug 31, 2000 at 14:56 UTC
    Since you reference it, let me add that most of us use the far more compact and easy to retype and demonstratably faster code like:
    $_ = shift; print unpack "N", pack "B*", ("0" x (32 - length)) . $_;

    -- Randal L. Schwartz, Perl hacker

Re: Binary to Decimal (zdog's way)
by I0 (Priest) on Dec 30, 2000 at 18:44 UTC
    in v5.6.0 oct"0b$_"

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