INCLUDE Irvine32.inc
.data
    var DB 12h, 34h, 56h, 78h

.code
main PROC
    ;Manipulate var in such a way you can output 12345678h in one call

    MOV EBX, OFFSET var
    MOV AL, [EBX]
    XCHG AL, [EBX + 3]
    MOV [EBX], AL

    MOV AL, [EBX + 1]
    XCHG AL, [EBX + 2]
    MOV [EBX + 1], AL


    MOV EAX, DWORD PTR var
    CALL WriteHex

    MOV al, 0Ah
    CALL WriteChar
    CALL WaitMsg

    INVOKE ExitProcess, 0
main ENDP

END main