addition proc near start3:sub ax,ax       sub dx,dx       mov bx,offset op1       mov al,[bx+1]       mov si,ax       mov bx,offset op2       cmp byte ptr[bx],al                            jbe calc       mov di,ax       mov al,[bx+1]       mov si,ax       mov ax,0       push ax       popf ;------------------------------------------------------初始化运算 calc:  mov al,[bx+si+2]       mov dl,[bx+di+2]       adc al,dl ;--------------------------------------------------------调整BCD       cmp al,10       jb input1       add al,6 ;------------------------------------------------------------把结果存入内存 input1:push bx       mov bx,offset pro1       add al,30h       mov [bx+si+2+1],al       pop bx ;----------------------------------------------------------------继续判断       dec si       dec di       cmp di,0       jnz calc cmsi: cmp si,0       jz exit3       mov al,[bx+si+2]       adc al,0 input2:push bx       mov bx,offset pro1       mov al,30h       mov [bx+si+2+1],al       pop bx       dec si       cmp si,0       jz exit3       mov al,[bx+si+2]       jmp input2 exit3: mov ax,0900h       mov dx,offset pro1       int 21h       ret addition endp        init proc near       sub ax,ax       sub dx,dx       mov bx,offset op1       mov al,[bx+1]       mov si,ax       mov bx,offset op2       cmp byte ptr[bx],al       jbe re       mov di,ax       mov al,[bx+1]       mov si,ax re:      ret init endp end main

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