Question

微机原理与汇编语言 x=3,y=6,z=80,计算表达式 ((x+y))×4-z)÷30

Answer 1

; ((x+y)*4-z)/30
;  3  6    80

        CODE  SEGMENT
              ASSUME    CS:CODE

           X  DW        3
           Y  DW        6
           Z  DW        80
           R  DW        0

      START:  PUSH      CS
              POP       DS
              PUSH      CS
              POP       ES
              MOV       AX,X
              ADD       AX,Y
              MOV       DX,0
              CWD
              SHL       AX,1
              RCL       DX,1
              SHL       AX,1
              RCL       DX,1
              SUB       AX,Z
              SBB       DX,0
              MOV       BX,30
              IDIV      BX
              ; 结果 商在ax 中，余数在dx中
              MOV       AH,4CH
              INT       21H
        CODE  ENDS
              END       START