Sinclair ZX80 / ZX81 Forums

Not sure what you're driving at but no GOSUB or GOTO is required when defining a function within a string or its later evaluation. IE.. 10 INPUT A 20 INPUT B 30 INPUT X 40 LET Z$="A*B/SIN X" 50 PRINT VAL Z$ Functioned defined within Z$ and evaluated in line 50 using the variables previously input a...

Yes Sinclair Basic is more dynamic here. E.g. GOTO VARNAME works fine in Sinclair Basic, but gives an error in Commodore Basic, where GOTO and GOSUB can only be followed by a number. A quirk of Microsoft (Commodore) BASIC is that you can do this: 100 GOSUB 1000 UPDATE SCORE:PRINT S 999 END 1000 S=S...

Moggy wrote: ↑

Mon Dec 10, 2018 4:09 pm

Mathematical functions simple and complex can be defined within a string in zx81 basic and the evaluation of said function, after whatever values needed are entered, can be called by simply asking the strings value.

That would require a GOSUB or GOTO.

Regards,

Shaun.

verbose how? More commands, may use GOTO and GO TO and data handling can handle strings without quotation marks in some cases. There are 71 commands. Also allows to define simple mathematical functions to be defined and called anywhere. I am of course comparing ZX80/81 BASIC to BASIC V2 as describe...

I like it!

Also something else considered bad practise - same line comments ;-) Regards, Shaun. same line comments? Yes, like this: 10 PRINT "Hello ";: GO TO 10: REM This is an inline comment It's kind of considered common practise in assembly, but not so in high-level languages. But then who cares about codi...

Also something else considered bad practise - same line comments

Regards,

Shaun.

For me, the most annoying limitation of the ZX80 and ZX81 BASICs is no multi-statement lines :( This is the apparent annoyance with ZX Spectrum BASIC (and all other variants except for ZX80/81 BASIC) because multi-statemented BASIC lines might make it more difficult to debug. As this is primarily a...

We've had our first ZX81 entry:

https://cgc.source.run/entries.html#todos

Wibble!

Hi Dr Beep,

I though the comparison was for ZX81 BASIC against VIC-20 BASIC. If not, then one may also define mathematical functions in ZX Spectrum BASIC, but more complex than those on BASIC v2.

Regards,

Shaun.