Sinclair ZX80 / ZX81 / Z88 Forums

From what I'm reading, I believe that ZX81 doesn't allow multiple commands off the back of one IF THEN statement, but I thought I'd ask here to be sure.

ZX81 BASIC only allows one command per line. IF being a "special" case, but you can only have one command after the THEN, the THEN being mandatory.

Of course, you can have another IF after the THEN. You can also have a complex expression as part of the IF.

Mark

Thanks for confirming. Just going to have to write more code

msknight wrote: ↑Thu Feb 29, 2024 9:28 pm Thanks for confirming. Just going to have to write more code

Easiest is
IF condition THEN GO SUB linenumber

and at linenumber code mutiple lines and end with RETURN

Cheers. In my case, it's just two statements so I might as well leave it at that for what I'm doing... but I'll keep that in mind for the future.

Implementing multistatement lines is actually fairly simple, in MC. It's just a matter of keeping track of the chr addresses in the line.

The program "SHREB" from 1986 uses multistatement lines. Since you have a ZXPand you maybe interested in these programs...

https://www.sinclairzxworld.com/viewtop ... =11&t=4739

Greg