将奇数小数位计算为整数中总位数的分数

Question

Write an assembly MACRO that takes an integer number as parameter. Keep dividing the number by 10 until it reaches zero. Then compute the percentage of odd digits in that number. ( Example if num=73458 then the percentage is = 3/5=0.6)

我的代码

.model small
.code
.data

x dd 73458
MOV AX,@DATA
MOV DS,AX
mov si,offset x
mov ax,[si] 
mov dx,[si+2]
mov cx,0
start:
cmp ax,0
je l2
mov bx,10
div bx
mov dl,al
mov dh,0
mov al,0
mov bl,2
div bl
cmp ah,0
jne l3 
je l4
l4:
mov ax,dx
jmp start
l3:
inc cx 
mov ax,dx
jmp start
l2:
mov dl,'0'
mov ah,2
int 21h
mov dl,','
mov ah,2
int 21h
mov ax,5
mov bh,0
mov bx,cx
div bl
mov dl,ah
mov ah,2
int 21h

end

但是上面有错误你能帮我避免错误吗

Answer 1

您已将 73458 加载到 DX:AX。第一次执行DIV BX后，DX就是余数（8），AX就是结果（7345）。您可以测试余数是否为奇数，如下所示：

  mov bx,10
start:
  div bx
  test dl, 1
  jz l1 ; Bit zero is zero so the digit is even
  inc cx ; Count up odd digit
l1:
  test ax, ax ; If ax is zero, we are done
  jz l2
  xor dx, dx ; Set dx to zero for next divide
  jmp start

将奇数小数位计算为整数中总位数的分数

Count odd decimal digits as a fraction of total digits in an integer

assembly

x86-16