variable declaration style

I've always been told this was just a matter of style/taste, but I was wondering if that is actually the case:

example 1 - better for brevity:

Code:

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LPDIRECTINPUTDEVICE7 diKB=NULL, diMS=NULL;
int a=0, b=0, c=0;

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example 2 - better for clarity:

Code:

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LPDIRECTINPUTDEVICE7 diKB=NULL;
LPDIRECTINPUTDEVICE7 diMS=NULL;
int a=0;
int b=0;
int c=0;

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I've tried both on large projects and haven't noticed anything different as far as compile time, program speed, etc.. Is either considered a standard or is it really just a matter of taste?

It's a matter of taste and clarity.

I personally mix the two styles.

If variables are logicaly related to each other, I use your first form. If they are not, I use the second form. if I can't use the first form and they are related, I create groups of variable declarations, like this:

Code:

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int a = 0;
lng b=0;

int k = 0;
char m='c';

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For me, the most important is to, not only identify them, but also understand possible relationships, at a glance.

Finally, I only declare at the top of the current scope those variables that are somewhat relevant to the business model. Flags and such, I only declare and initialize when I need them.

I prefer a combination of the two for long lists of variables:

Code:

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int a = 0,
    b = 0,
    c = 0;

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For short lists such as the above (only an example), I place them all on the same line since they are relatively easy to locate.

-Prelude

Quote:

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Originally posted by Prelude

Code:

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int a = 0,// comment1
    b = 0, // comment 2
    c = 0;

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and If you add some comments that will be great ;)