In my previous post, I suggested that bAdkOde might be Turing Complete by writing a quine. One of the ways to actually prove Turing Completeness is to try and write an interpreter for another Turing-Complete language in bAdkOde. Another approach involves providing a direct translation from another Turing-Complete language into bAdkOde. Here, I prove the Turing Completeness of bAdkOde by providing a direct translation from Brainfuck into bAdkOde.
Assumptions
- The a register is our memory pointer.
- We initialize the a register to 0.
Proof
We translate Brainfuck to bAdkOde using the following mappings or rules:
- > maps to +1a
- < maps to -1a
- + maps to +1[a
- - maps to -1[a
- . maps to "[a
- , maps to ?[a
- [ maps to {![a
- ] maps to }
Conclusion
Since we can completely translate or map Brainfuck, an already Turing-Complete language into bAdkOde, we can say that bAdkOde is also Turing Complete.
Translated example
helloworld.bf:
+++ +++ +++ + [ > +++ +++ + > +++ +++ +++ + > +++ > + <<< < - ] >++ . >+. +++ +++ +. . +++ . >++ . <<+ +++ +++ +++ +++ ++. >. +++ . --- --- . --- --- --. >+.
helloworld.bad
>0a+1[a+1[a+1[a +1[a+1[a+1[a +1[a+1[a+1[a +1[a {![a +1a +1[a+1[a+1[a +1[a+1[a+1[a +1[a +1a +1[a+1[a+1[a +1[a+1[a+1[a +1[a+1[a+1[a +1[a +1a +1[a+1[a+1[a +1a +1[a -1a-1a-1a -1a -1[a } +1a+1[a+1[a "[a +1a+1[a"[a +1[a+1[a+1[a +1[a+1[a+1[a +1[a"[a "[a +1[a+1[a+1[a "[a +1a+1[a+1[a "[a -1a-1a+1[a +1[a+1[a+1[a +1[a+1[a+1[a +1[a+1[a+1[a +1[a+1[a+1[a +1[a+1[a"[a +1a"[a +1[a+1[a+1[a "[a -1[a-1[a-1[a -1[a-1[a-1[a "[a -1[a-1[a-1[a -1[a-1[a-1[a -1[a-1[a"[a +1a+1[a"[a
Here's a quick perl script that I whipped up, to translate Brainfuck to bAdkOde:
#!/usr/bin/perl
use strict;
my $terminator = $/;
undef $/;
my $bf =
$bf =~ s/[^<>\[\]\.,\+\-\s\n]//g;
$/ = $terminator;
my $i = 0;
print ">0a";
while($i < length($bf)) {
my $bf_instruction = substr($bf, $i, 1);
if($bf_instruction eq '>') {
print "+1a";
}
elsif($bf_instruction eq '<') { print "-1a"; } elsif($bf_instruction eq '+') { print "+1[a"; } elsif($bf_instruction eq '-') { print "-1[a"; } elsif($bf_instruction eq '.') { print "\"[a"; } elsif($bf_instruction eq ',') { print "?[a"; } elsif($bf_instruction eq '[') { print "{![a"; } elsif($bf_instruction eq ']') { print "}"; } else { print $bf_instruction; } $i++; } [/sourcecode] Additional proof
Since there exist self-interpreters for Brainfuck (i.e., Brainfuck interpreters written in Brainfuck), and since it has been shown that there exists a valid translation from Brainfuck to bAdkOde, it follows that it is possible to write a Brainfuck interpreter in bAdkOde. This provides additional proof for the Turing Completeness of bAdkOde.
you mustve aced computational theory
@sheehan
Haha, I think I actually got a B because I slacked off during finals. But I do like some aspects of computational theory! 🙂 Eh… I’m a nerd, what can I say? Heh.