YAPC::EU 2018 Glasgow Update!

Task/Caesar-cipher/ZX-Spectrum-Basic/caesar-cipher-1.zx

@@ -0,0 +1,13 @@
+10 LET t$="PACK MY BOX WITH FIVE DOZEN LIQUOR JUGS"
+20 PRINT t$''
+30 LET key=RND*25+1
+40 LET k=key: GO SUB 1000: PRINT t$''
+50 LET k=26-key: GO SUB 1000: PRINT t$
+60 STOP
+1000 FOR i=1 TO LEN t$
+1010 LET c= CODE t$(i)
+1020 IF c<65 OR c>90 THEN GO TO 1050
+1030 LET c=c+k: IF c>90 THEN LET c=c-90+64
+1040 LET t$(i)=CHR$ c
+1050 NEXT i
+1060 RETURN