On Mon, Apr 10, 2023 at 11:29 AM Peter Vollan <dprogra...@gmail.com> wrote:
> I still don't understand. > > BASIC control flow is accomplished by GOTO, GOSUB, RETURN (as well as FOR-NEXT, IF, THEN, and ON) In particular, in BASIC you have lots of GOTOs and GOSUBs and RETURNs to program lines. So any given BASIC statement within a program line can branch (GOTO/GOSUB/RETURN) to any other program line. And a given program line can be the target of a branch (GOTO/GOSUB/RETURN). For the author or maintainer of a BASIC program this can create a spaghetti mess of program flow that is hard to keep track of. A cross reference utility like Lloyd wrote helps you understand the structure of a BASIC program by parsing it and listing out what lines jump to other lines, and for given lines, what other lines jump to them. -- John.
