Modulo

• Action Code: 0x3f
• Stack: 1 → 1
• SWF version: 5

Note: A better name would be remainder instead of modulo, due to sign-sensibility.

Abstract AS2

@t0 = @pop();
@push(@pop() % @t0);

Adobe documentation

ActionModulo

ActionModulo calculates x modulo y. If y is 0, then NaN (0x7FC00000) is pushed to the stack.

Field	Type	Comment
ActionModulo	ACTIONRECORDHEADER	ActionCode = 0x3F

ActionModulo does the following:

1. Pops x then y off of the stack.
2. Pushes the value x % y on to the stack.