Logic errors

Post by **Jeff-20** » Fri Feb 13, 2004 7:28 pm

Look at this line. Can you see why it produces a SYNTAX ERROR?

10 FOR T=1 TO 15: PRINT T AND 3: NEXT

Look closely. The problem is quite simple. Typed without spaces (as we all do), the computer wants to read "T AND 3" as "TAN D3".

Tan is a basic token, and without a parenthetical following, the computer assumes it is a mistake. THe problem is easily fixed by replacing the variable T.

aneurysm · Post by **aneurysm** » Sat Mar 06, 2004 11:17 pm

GreyGhost · Post by **GreyGhost** » Sat Feb 11, 2006 10:51 am

I got caught up with this one for five minutes:

10 INPUT "{CLR}FILE NAME:";FN$

So simple, yet so frustrating.

Post by **Jeff-20** » Sat Feb 11, 2006 12:28 pm

DEF FN? (I'm not sure. . .)

Tepic · Post by **Tepic** » Sat Feb 11, 2006 12:32 pm

I think the FN part.

A=FNB(2) etc

Schema · Post by **Schema** » Sat Feb 11, 2006 3:46 pm

Jim Butterfield did a hilarious talk on this at World of Commodore last year. You can also type

10 FOR T=1 TO 15: PRINTT{graphics character}AND3: NEXT

BASIC will remove the graphics character and the line will look OK. But if you hit Return on the line again, you get the error.

carlsson · Post by **carlsson** » Sat Feb 11, 2006 6:04 pm

Or for that matter TA{SHIFT+N}3. The parser will look up rather than expand the abbreviation before inserting the right token.

SYS53387E$ was solved as SYS(53387)E$. In similar fashion, PRINT(T)AND3 would also be a solution here.