10 LET x$="1": LET y$="0": LET z$=""
20 PRINT "N, Length, Entropy, Word"
30 LET n=1
40 PRINT n;" ";LEN x$;" ";
50 LET s$=x$: LET base=2: GO SUB 1000
60 PRINT entropy
70 PRINT x$
80 LET n=2
90 PRINT n;" ";LEN y$;" ";
100 LET s$=y$: GO SUB 1000
110 PRINT entropy
120 PRINT y$
130 FOR n=1 TO 18
140 LET x$="1": LET y$="0"
150 FOR i=1 TO n
160 LET z$=y$+x$
170 LET p$=x$: LET x$=y$: LET y$=p$
180 LET p$=y$: LET y$=z$: LET z$=p$
190 NEXT i
200 LET x$="": LET z$=""
210 LET s$=y$: GO SUB 1000
220 PRINT n+2;" ";LEN y$;" ";entropy
230 PRINT y$ AND (LEN y$<32)
240 NEXT n
250 STOP
1000 REM Calculate entropy
1010 LET sourcelen=LEN s$: LET entropy=0
1020 DIM t(255)
1030 FOR j=1 TO sourcelen
1040 LET digit=VAL s$(j)+1: LET t(digit)=t(digit)+1
1050 NEXT j
1060 FOR j=1 TO 255
1070 IF t(j)>0 THEN LET prop=t(j)/sourcelen: LET entropy=entropy-(prop*LN (prop)/LN (base))
1080 NEXT j
1090 RETURN