When I try to assemble this code:

%include "asm_io.inc"
%define 	SIZE 100 		;#define SIZE 100
MOV			SIZE, eax		;eax = SIZE

CALL 		print_int, SIZE	;std::cout << eax

I commented the c++ equivelent of the asm code

I get this error:
error: binary format does not support external references

I assemble with a batch file i wrote:

@echo off
cd "C:\Documents and Settings\tom\Desktop\nasm-2.05.01"
nasm -f bin %1 -o %1.com
cd "C:\Documents and Settings\tom\"

Can someone tell me why this error is appearing?