Loop problem - GameCreators Forum

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Vesper103

16

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Joined: 21st Feb 2008

Location: Beloit WI

Posted: 24th May 2008 22:33

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this is the last thing i thought id need help with >.> but I'm having problem with for loops. in specific with variable scope in for loops.

ive tried to include the variable offset 2 seperate ways:

way 1:

+ Code Snippet

for(int y=0 , int offset=0 ; y<=cols ; y++, offset+=rows)
		{
			for(int x=0 ; x<=rows ; x++)
			{
				dbSprite(x+offfset,x*32,y*32,1);
			}
		}

way 2:

+ Code Snippet

int offset=0;
		for(int y=0  ; y<=cols ; y++)
		{
			for(int x=0 ; x<=rows ; x++)
			{
				dbSprite(x+offfset,x*32,y*32,1);
			}
			offset+=rows;
		}

the first one returns aroudn 6 errors all talking about "int unexpected" and "undeclared "offset""

the second gives 1 error in the X loop for "offset undeclared"

what am I doing wrong?

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Vesper103

16

Years of Service

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Joined: 21st Feb 2008

Location: Beloit WI

Posted: 24th May 2008 22:35

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FIX: i found the problem with the second way.. spelling error. but the first one still wont compile....

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jinzai

18

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Joined: 19th Aug 2006

Location: USA

Posted: 24th May 2008 23:44 Edited at: 24th May 2008 23:47

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That's because you have a comma after the initial condition on the outer loop...supposed to be a semi-colon. EDIT : I see what you are trying to do now, try this:
int y, offset = 0;

Or this:

int y, offset;

for (y = 0, offset = 0; etc.

I will again advise you not to declare variables with that type of scope. There is no real advantage to doing so, and it will continue to bite you until you only use them in the limited way that allows. They occupy space on the stack either way, unless they are declared at the global data scope, outside of any functions altogether. The most pain free and consistent way to declare local variables is at the top of the function.

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Vesper103

16

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Joined: 21st Feb 2008

Location: Beloit WI

Posted: 25th May 2008 00:43

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okay thank you

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