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%macro DosPrintMsg 1+
	%ifnid %1
		section .data

		%%str_to_print:db %1

		section .text

		mov dx,%%str_to_print
		mov ah,9
		int 0x21
	%else
		mov dx,(%1)
		mov ah,9
		int 0x21
	%endif
%endmacro

%macro DosExit 1
	%if (%1) == 0
		;use short-form return 0 exit
		int 0x20
	%elif ((%1) < 256) && ((%1) > 0)
		mov ax,0x4C00 | (%1)
		int 0x21
	%else
		%error Invalid return value
	%endif
%endmacro

	section .text
	DosPrintMsg predefined_str
	DosPrintMsg "Using string with macro-defined label",10,0
	DosExit 0
	DosExit 1

	section .data
	predefined_str:db "Using string with predefined label",10,0