#define ?????

[wow9999]

Hi there

Can someone tell me What these code mean and why people want to write code like these?


#define LVNI_ALL 0x0000
#define LVNI_FOCUSED 0x0001
#define LVNI_SELECTED 0x0002
#define LVNI_CUT 0x0004

I know that 0x0000, 0x0001, and 0x0002 are Hexadecimal, and those are 0,1,2 in decimal.

Can I change those code to:
#define LVNI_ALL 0
#define LVNI_FOCUSED 1
#define LVNI_SELECTED 2
#define LVNI_CUT 4

Thank for your help

[RussG1]

It is another way of making in alias so that you may use the decriptive text rather than it's numerical equivilant in your code.

[Jim McCreary]

The reason it is in hex is an easy reminder that you are defining unique bits so you can use code like:

if ( a | flag1 || a | flag2 )

Notice that this is a bit wise or not the || operator.