Multi-line DEFINE directives?

Question

I am not an expert, so go easy on me. Are there any differences between these two code segments?

#define BIT3 (0x1
<
<
3)
static int a;

Answer 1

For example:

#define fact(f,n)   for (f=1; (n); (n)--) \
                      f*=n;

You can separate the lines with the \ character. Note that it is not macro specific. You can add the \ character in your code whenever you would like to break a long line.