how convert nasm %define to fasm

example:
%define round(a, b) ((a+(b-1))/b)
dw round (5,10)

Relation of preprocessor and assembler is big different in FASM, in order to simply say how to do "%define in FASM". As for your specific example, FASM doesn't really have "macros" per-se, only "macroinstructions", meaning you can't really make a inline macro in FASM. This is one of few quite nasty limitations of FASM, made for by few great features not found anywhere else. You can overload "dw" and other data directives to accept arguments in certain format, but you can't make a true inline macro.

thanks