I have a silly question

I found some scripts have |=
For example, p.flags |= (BRIGHT | MOVE);
or p.flags |= MOVE;
I don't know what's the meaning of |=

here you go

Thanks, but I can hardly understand what it is for.

Well this | is a so called "bitwise" or.
If you have a binary number like 0110 and another binary number like 0100 you can use the OR to connect them and "calculate" a resulting number.
In this case:
0110 | 0100 = 0110
What you do:
You look at each "position" in both number strings and if one of them 1 you write a 1 to the result:
0 | 0 = 0
0 | 1 = 1
1 | 1 = 1
0 | 0 = 0
result = 0110

The |= operatator does the same but also includes an assignment to another variable.
a |= b
is the same as:
a = a | b

Hope this makes some sense to you.

The flags in 3dgs (SHOW, POLLYGON and so on) are all saved in one Bit. With this Operator (|=) you can set only the bit you need. (SHOW is set now).

In Lite-C there is an operator to make decision about equality.
In this language, as like as all "C" like languages, this operator is the "==".
Sometime in programming we need to examine the reversed equality for this purpose is being the "|=".
So just imagine

• 1. == equal
• 2. |= not equal
• 3. >= greater than
• 4. <= less than

and so on...

^ That's wrong, != is the not equal comparison, not |=.

True, that is my fault. I am sorry.

Now is:
Aku_Aku == true;