Just had a quick look on t'internet and the first line should probably be

If (n MOD 1)=0

where n is the number you are checking.

Try both.

I did not know anyone was still using Clive's ZX81, what do you do on it.

If you need an emulator or more zx81 software, have a look at link.

Terry

enter link description here

1: http://uk.search.yahoo.com/search;ylt=A0geu8UEtahQ2n4A0pLBQx.?ei=UTF-8&fr=ush1-finance&p=zx81%20emulator&SpellState=&fr2=sp-qrw-corr-top/ "ZX81"

I know this has been ticked as resolved, but the handiest way of checking whether a number is, and ensuring that it is, a whole number in Basic is: if x<>int(x) then x=int(x). Depending on which Basic you're using, you may have to insert appropriate quotation marks or parenthesis around int(x). Hope this is of some use to you. :-)

Of course , you are correct. I thought he was tying to force the calculation to be an integer if it wasn't one already. The first half of the statement still holds true though - if x<>int(x) then ..... whatever he wants to do - goto,gosub, print, stop, end etc. I'm fascinated that he's still using a ZX 81 - I started with the Spectrum way back when!

amstrad

Have you tried here?-:

Basic

Thanks for the info about your project - those were the days. I even started to learn machine code on that machine!! Progressed to Commodore 64 then Amiga 500+ (along with AMOS basic).