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location of heap manageme...
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non-paged supervisor code...
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Old zxbasic game errors
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Error: Undefined GLOBAL l...
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A Fast(er) Plot Routine f...
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Hall of Fame - Include fo...
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[SOLVED] Array layout bug...
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| Returning a String from a function |
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Posted by: LTee - 2011-03-03, 05:57 PM - Forum: Help & Support
- Replies (9)
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Hi all!
Is it possible to return a string from a function? I tried this:
Code: dim result as STRING
result = test(50)
print result
function test(n as UBYTE) as STRING
return str(n)
end function
But I get a compile error:
Code: test.bas:2: Cannot convert value to string. Use STR() function
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| -d (display debug info) not working? |
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Posted by: LCD - 2011-03-01, 12:14 AM - Forum: Bug Reports
- Replies (7)
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Hi Boriel. Maybe it is a bug... If I try to use -d option for displaying debug info, the compiler enters a infinite loop. Is it not supported anymore in build 2114?
Ah, the program is a simple PRINT "Hallo", nothing else.
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| Version 1.2.7 released! |
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Posted by: boriel - 2011-02-26, 11:42 PM - Forum: ZX Basic Compiler
- Replies (2)
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Okay, finally version 1.2.7 is out (revision 2114).
It's a major refactorization of the zxbpp and zxbasmpp (the preprocessors).
Check the changelog if interested. Basically, main changes are: - + DRAW is now much faster (and a bit more larger)
- + PLOT, DRAW and CIRCLE now supports change screen address (for double-buffering)
- + Added LBOUND() and UBOUND() functions
- ! Fixed a bug in IF/THEN/ELSEIF/ELSE construct (thanks to LTee)
- + Added a completely new preprocessor which now support true macros and
better line counting handling. This has been a major change in the compiler.
- + Added string management library with
UCase(), LCase(), Ucase2(), LCase2(), InStr() and StrPos()
- ! UDG where not being handled into the Heap, which might lead to program
crash (fixed). This is done only if --sinclair or -Z flag is used.
- + Added suport for BIN, so BIN 01010101 is also accepted now.
- ! Fixed a bug with string parameters passed by value (again) not being correctly
free upon return and crashing the program.
- + BEEP with constant duration and pitch (e.g. BEEP 1, 2) has been
optimized for space (and also slightly faster)
- + Added Flight Simulator example
You can download it at <!-- m --><a class="postlink" href="http://www.boriel.com/files/zxb">http://www.boriel.com/files/zxb</a><!-- m --> (will redirect you to the archive).
Legacy version 1.2.6 will also remain there. :wink:
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| UBYTE/FOR loop issue? |
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Posted by: LTee - 2011-02-25, 02:07 PM - Forum: Help & Support
- Replies (4)
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I wrote the following code to list out the numbers from 0 to 255:
Code: DIM i as UBYTE = 0
for i = 0 to 255
print i;" "
next i
The code compiles and runs, but it never ends. When the loop gets to 255, it begins again from 0. :-)
Making the loop "0 to 254" or changing i to an INTEGER/UINTEGER gets around the issue.
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| Pass an array as a parameter? |
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Posted by: LTee - 2011-02-24, 03:46 PM - Forum: Help & Support
- Replies (3)
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A question today, rather than a bug. :-)
Is it possible to pass an array as a parameter to a function or a sub?
And if so, does the function/sub receive a copy of the array or a pointer to the original? i.e. if I made changes to the array within a function, would those changes be local to the function or would they also be visible from the calling method?
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| ELSE issue? (*solved*) |
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Posted by: LTee - 2011-02-23, 05:29 PM - Forum: Bug Reports
- Replies (12)
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Have you had enough of me yet? :-D
I'm having a weird issue with ELSE, but I'm not sure if I'm doing something wrong or not. Take a look at this test program:
Code: dim num as ubyte
cls
num = 1
test()
num = 2
test()
num = 3
test()
num = 4
test ()
sub test
IF num = 1 THEN
PRINT "1"
ELSEIF num = 2 THEN
PRINT "2"
ELSEIF num = 3 THEN
PRINT "3"
ELSE
PRINT "X"
END IF
PRINT "---"
end sub
I would expect the output from this to be like this:
Code: 1
---
2
---
3
---
X
---
But it's actually like this:
Code: 1
---
2
---
3
X
---
X
---
Condition "3" is running correctly, but the final ELSE block is also being processed so you get two lines output if num is 3. Have I messed up the syntax there? The behaviour is certainly different to how it used to be, as an old program that used to be okay is now failing.
I've tried this in 2100 and also 1866 and it does the same in both, so it must've been a while since I compiled it! :-)
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| Small brackets-parsing glitch (*solved*) |
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Posted by: LTee - 2011-02-23, 02:38 PM - Forum: Bug Reports
- Replies (5)
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Messing around with some of my other code over lunchtime with the latest beta (2100), I discovered a small error when parsing brackets.
Take a look at this code:
Code: DIM test(10, 10) as UBYTE
DIM x as UBYTE
DIM y as UBYTE
x = 5
y = 5
PRINT test(x - 1, y)
PRINT test((x - 1), y)
PRINT test(x, y - 1)
PRINT test(x, (y - 1))
The final PRINT statement will not compile unless you remove the brackets from around the (y - 1). Strangely, the brackets seem to be okay if we're dealing with the first dimension of the array (so it's okay to have 'x - 1' in brackets), just not for the second. :-)
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| array bounds must be constant |
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Posted by: slenkar - 2011-02-22, 06:02 PM - Forum: Help & Support
- Replies (11)
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How do I create an array with an integer instead of a literal number?
I want to do this:
Code: DIM personX (numPersons) as ubyte
DIM personY (numPersons) as ubyte
DIM personHealth (numPersons) as ubyte
DIM personWeapon (numPersons) as ubyte
instead of:
Code: DIM personX (6) as ubyte
DIM personY (6) as ubyte
DIM personHealth (6) as ubyte
DIM personWeapon (6) as ubyte
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| UDG problem |
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Posted by: slenkar - 2011-02-22, 05:32 PM - Forum: Help & Support
- No Replies
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I have 2 graphics
factory.bin and select.bin
factory is 17 bytes and select.bin is 9 bytes
When I put include select.bin first the graphics work
but when i include factory.bin first the select.bin graphic is not shown on screen, it is just blank
both were created and exported from sevenup sprite editor.
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| too fast :) |
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Posted by: slenkar - 2011-02-22, 01:48 AM - Forum: Help & Support
- Replies (8)
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i have a cursor that i move around the screen with the keys but its too fast
when i press "p" it shoots half way across the screen, how do i make it move 1 square every half a second
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