汇編语言程序设计 EXCH MEM macro mem 1, MEM 2, REG MOV REG, MEM 1 XCHG REG, MEM 2 MOV mEM 1, REG ENDM DATA SEGMENT DA W1 DW 55AAH DA W2 DW 6688H DATA ENDS CODE SECMENT ASSUME CS: CODE, DS: DatA, SS: STACK START MOV AX, DATA MOV DS, AX ;宏调用和宏展开 EXCH MEM DAW1,DAW2,AX;宏指令语句 +++ Mov AX, Da WI XCHG AX, DA W2 Mov DA W1, REG MOv AH, 4CH INT 21H CODE ENDS END START汇编语言 程序设计 EXCH_MEM MACRO MEM_l，MEM_2，REG MOV REG，MEM_1 XCHG REG，MEM_2 MOV MEM_1，REG ENDM DATA SEGMENT DA_W1 DW 55AAH DA_W2 DW 6688H DATA ENDS CODE SECMENT ASSUME CS：CODE，DS：DATA，SS：STACK START： MOV AX，DATA MOV DS，AX ┇ ；宏调用和宏展开 EXCH_MEM DA_W1，DA_W2，AX ；宏指令语句 + MOV AX ，DA_Wl + XCHG AX，DA_W2 + MOV DA_W1，REG ┇ MOV AH，4CH INT 21H CODE ENDS END START