y = y - 4 reads as y4??? confusing syntax error.

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0motnahp0

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Posted: 13th Apr 2012 20:57

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I'm new.

heres my code

+ Code Snippet

 sync on : hide mouse : sync rate 60

    load image "player.png", 1

    x = 0
    y = 0

    sprite 1, x, y, 1

    do
    sprite 1, x, y, 1

    if upkey()
    y = y – 4
    endif

    if downkey()
    y = y + 4
    endif

    if leftkey()
    x = x – 4
    endif

    if rightkey()
    x = x + 4
    endif

    sync
    loop

heres my error:

could not determine perameter type of 'y4' at line 19.

line 19 refers to the code: y = y – 4

if I erase that line, it does the same thing for each of the other 3 directions.

any ideas how to make the code work? tried on 2 computers

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Sergey K

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Posted: 13th Apr 2012 23:26

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not sure whats the problem is, but you always can u se Inc and Dec functions to increase and decrease your numbers
x = x+4
same as:
inc(x,4)

or
y = y - 4
same as:
dec(y,4)

replace those and try again.

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IanM

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Posted: 13th Apr 2012 23:27

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Cool typo you have there

Basically, where you have:
y = y – 4

you should have:
y = y - 4

Although it's not obvious from the font in use here, the first minus sign (the one that you use) isn't actually a minus sign - it's a dash.

If you are using the new/standard editor with the default colour scheme, you can see that your minus sign is in black, while mine would be in red (same colour as the numbers) and is slightly shorter.

Here's your corrected code:

+ Code Snippet

sync on : hide mouse : sync rate 60

load image "player.png", 1

x = 0
y = 0

sprite 1, x, y, 1

do
    sprite 1, x, y, 1
    
    if upkey()
        y = y - 4
    endif
    
    if downkey()
        y = y + 4
    endif
    
    if leftkey()
        x = x - 4
    endif
    
    if rightkey()
        x = x + 4
    endif
    
    sync
loop

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Green Gandalf

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Posted: 13th Apr 2012 23:32 Edited at: 13th Apr 2012 23:34

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It's because you've used a character that isn't a minus sign. The following code, which superficially looks like yours, compiles fine:

+ Code Snippet

sync on : hide mouse : sync rate 60

    load image "player.png", 1

    x = 0
    y = 0

    sprite 1, x, y, 1

    do
    sprite 1, x, y, 1

    if upkey()
    y = y - 4
    endif

    if downkey()
    y = y + 4
    endif

    if leftkey()
    x = x - 4
    endif

    if rightkey()
    x = x + 4
    endif

    sync
    loop

I've no idea which character you managed to type there - or how.

Edit Posted too late again - serves me right for watching TV at the same time.

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IanM

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Posted: 13th Apr 2012 23:45

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Usually cause by copy/paste from a word processor like Word or LibreOffice/OpenOffice, which 'auto-correct' a minus into a dash when it's surrounded by spaces.

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Green Gandalf

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Posted: 13th Apr 2012 23:50

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