For a regex solution, which functions a bit recursively even though it's just repetitive: 
C:\>perl -p -e"1 while s/^([01 ]*?)([01]*)-([-01]*)([-01 ]*)$/$1${2}0$
+3 ${2}1$3$4/"
000- 0101 011- 1-0-
0000 0001 0101 0110 0111 1000 1001 1100 1101

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In reply to Re: Working with Binary Numbers by catellus
in thread Working with Binary Numbers by shoness

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