匯編程序編寫：

assume cs:code code segmentmov ax,2000hmov ss,axmov sp,0add sp,10pop axpop bxpush axpush bxpop axpop bxmov ax,4c00hint 21h code ends

寄存器：ax bx ss sp

ax, bx, ss, sp, 2000:10 x, 2000:12 y
step0:mov ax,2000h

ax=2000h, bx, ss, sp, 2000:10 x, 2000:12 y
step1:mov ss,ax

ax=2000h, bx, ss=2000h, sp, 2000:10 x, 2000:12 y
step2:mov sp,0

ax=2000h, bx, ss=2000h, sp=0, 2000:10 x, 2000:12 y
step3:add sp,10

ax=2000h, bx, ss=2000h, sp=10, 2000:10 x, 2000:12 y
step4:pop ax

ax=x, bx, ss=2000h, sp=12, 2000:10 x, 2000:12 y
step5:pop bx

ax=x, bx=y, ss=2000h, sp=14, 2000:10 x, 2000:12 y
step6:push ax

ax=x, bx=y, ss=2000h, sp=12, 2000:10 x, 2000:12 x
step7:push bx

ax=x, bx=y, ss=2000h, sp=10, 2000:10 y, 2000:12 x
step8:pop ax

ax=y, bx=y, ss=2000h, sp=12, 2000:10 x, 2000:12 y
step9:pop bx

ax=y, bx=x, ss=2000h, sp=14, 2000:10 x, 2000:12 y

總結(jié)

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