union.asm

想学习汇编语言的

TITLE Intro to Unions                       (Union.asm)

; This program demonstrates the UNION directive.
; Last update: 10/14/01

INCLUDE Irvine32.inc

Integer UNION
	D DWORD 0
	W WORD  0
	B BYTE  0
Integer ENDS

Comment !
FileInfo STRUCT
	FileID Integer <>
	FileName BYTE 64 DUP(?)
FileInfo ENDS
!

FileInfo STRUCT
  UNION FileID
	  D DWORD 0
	  W WORD  0
	  B BYTE  0
	ENDS
  FileName BYTE 64 DUP(?)
FileInfo ENDS

.data

val1 Integer <12345678h>
val2 Integer <>
val3 Integer <>

.code
main PROC

	mov eax,12345678h

	mov val1.B, al
	mov val2.W, ax
	mov val3.D, eax

quit:
     exit
main ENDP
END main