home *** CD-ROM | disk | FTP | other *** search
-
- [BINSU.REC]
- [Post version of binary sum]
-
- [To sum two binary numbers using Post's Productions, we set up
- two addition tables for the terminal digits of the numbers.
- One table is used initially, and when there is no carry present.
- The other is used to incorporate a propagated carry into the
- sum. Auxiliary symbols are naturally incorporated into the
- sum by writing the Axiom in the form a+b=c. The digits to be
- removed from a and b are identified by their proximity to + and
- =, respectively. As the sum is developed, its digits are inserted
- to the right of the = sign. The computation terminates when the
- auxiliary symbols are dropped after at least one of them
- reaches the front of its summand.]
-
- [Post Productions can deal with the digits to be summed even
- though they are widely separated. In a Markov Algorithm it is
- necessary to move one of them until it is in contact with the
- other before the addition table can be applied.]
-
- [[]]
-
-
-
- {
- [cr, lf] (2573TL;)&
- [read console] (R13%='';T08%(=2080[sp,bs]TL)(@J|;L@J;);)J
- [logon message] ('
- A Post Production scheme which will sum two binary
- numbers written in the form a+b=c; for example
-
- 111110+011=
-
- Each successive keystroke will display one more step
- in the transformation until the sum is finished.
- 'TL@&'Initial Axiom:'TL@&@JI;:)R
- [to shorten program] (UQzml;)U
- [write workspace] (JZqt;)W
- [to shorten program] (zZQml;)Z
- [signoff message] (@&'Theorem:'TL@&JZqt;)X
- (@R(@&@WRL
- JZ''E'0+'@U1$S('0+'E'0='@U2$S('0='E@Z3$S(
- JZD''I1$ryGI'+'I2$ryGI'=0'I3$ryGI''I;)nL;nL)nL;nL)nL:
- JZ''E'0+'@U1$S('0+'E'1='@U2$S('1='E@Z3$S(
- JZD''I1$ryGI'+'I2$ryGI'=1'I3$ryGI''I;)nL;nL)nL;nL)nL:
- JZ''E'1+'@U1$S('1+'E'0='@U2$S('0='E@Z3$S(
- JZD''I1$ryGI'+'I2$ryGI'=1'I3$ryGI''I;)nL;nL)nL;nL)nL:
- JZ''E'1+'@U1$S('1+'E'1='@U2$S('1='E@Z3$S(
- JZD''I1$ryGI'+'I2$ryGI'*0'I3$ryGI''I;)nL;nL)nL;nL)nL:
- JZ''E'0+'@U1$S('0+'E'0*'@U2$S('0*'E@Z3$S(
- JZD''I1$ryGI'+'I2$ryGI'=1'I3$ryGI''I;)nL;nL)nL;nL)nL:
- JZ''E'0+'@U1$S('0+'E'1*'@U2$S('1*'E@Z3$S(
- JZD''I1$ryGI'+'I2$ryGI'*0'I3$ryGI''I;)nL;nL)nL;nL)nL:
- JZ''E'1+'@U1$S('1+'E'0*'@U2$S('0*'E@Z3$S(
- JZD''I1$ryGI'+'I2$ryGI'*0'I3$ryGI''I;)nL;nL)nL;nL)nL:
- JZ''E'1+'@U1$S('1+'E'1*'@U2$S('1*'E@Z3$S(
- JZD''I1$ryGI'+'I2$ryGI'*1'I3$ryGI''I;)nL;nL)nL;nL)nL:
- JZ''E'+'@U1$S('+'E'='@U2$S('='E@Z3$S(
- JZD''I1$ryGI''I2$ryGI''I3$ryGI''I;)nL;nL)nL;nL)nL:
- JZ''E'+'@U1$S('+'E'*'@U2$S('*'E@Z3$S(
- JZD'0'I1$ryGI'+0'I2$ryGI'*'I3$ryGI''I;)nL;nL)nL;nL)nL:;)@X;)}
-
- [end]
-