[Misiur]

pawn Код:

native Float:operator+(Float:oper1, Float:oper2) = floatadd;

This is an operator override for variables tagged with "Float", which is included by default with a_samp (float.inc to be exact). However, you use "float". Those are not the same things. Also, I think if you define a value with a dot, it will be implicitly treated as a variable with Float tag.

See also: https://sampwiki.blast.hk/wiki/Scripting_Basics#Tags