我在下面有这个计算器代码，它工作正常，但它不会跳到“分裂”..我仍然在学习汇编编程的过程...需要帮助解决这个问题...
.model small .stack 100h .data msg1 db 13,10,13,10, "Enter 1st Number : $" msg2 db 13,10, "Enter 2nd Number : $" msgEr db 13,10, "Error $" msgCh db 13,10, "Press A to ADD , S to SUBTRACT ,D to MULTIPLY, F to DIVIDE, X to EXIT : $ " msgSum db 13,10,13,10, "Sum is : $" msgDif db 13,10,13,10, "Difference is : $" msgDiv db 13,10,13,10, "Quotient is : $" msgMul db 13,10,13,10, "Product is : $" tmp db ? .code start: mov ax, @data mov ds, ax lea dx, msg1 mov ah, 09h int 21h mov bx, 0 start1: mov ah, 01h int 21h cmp al,0dh je next1 mov ah,0 sub al,30h push ax mov ax,10d mul bx pop bx add bx,ax jmp start1 next1: push bx lea dx,msg2 mov ah,09h int 21h mov bx,0 start2: mov ah,01h int 21h cmp al,0dh je choice mov ah,0 sub al,30h push ax mov ax,10d mul bx pop bx add bx,ax jmp start2 choice: lea dx, msgCh mov ah, 09h int 21h mov ah, 01h mov answer, al int 21h cmp al,'f' je dividing cmp al,'a' je adding cmp al,'s' je subtracting cmp al,'d' je multiplying cmp al,'x' mov ah, 4ch int 21h error: lea dx,msgEr mov ah,09h int 21h jmp start dividing: pop ax div bx push ax lea dx,msgDiv mov ah,09h int 21h pop ax mov cx,0 mov dx,0 mov bx,10d jmp break adding: pop ax add ax,bx push ax lea dx,msgSum mov ah,09h int 21h pop ax mov cx,0 mov dx,0 mov bx,10d jmp break multiplying: pop ax mul bx push ax lea dx,msgMul mov ah,09h int 21h pop ax mov cx,0 mov dx,0 mov bx,10d jmp break subtracting: pop ax sub ax,bx push ax lea dx,msgDif mov ah,09h int 21h pop ax mov cx,0 mov dx,0 mov bx,10d break: div bx push dx mov dx,0 inc cx or ax,ax jne break ans: pop dx add dl,30h mov ah,02h int 21h loop ans jmp start end start
答案 0 :(得分：1)
在执行操作之前，您必须清除DX。 x86中的部门将在DX:AX上运行。如果您没有先清除它并且它有一些内容，则可能会出现溢出情况。显然，这很糟糕。 ：）
所以：
dividing:
pop ax
div bx
应该成为：
dividing:
pop ax
mov dx,0
div bx
答案 1 :(得分：-1)
.model small
.stack 100h
.data
msg1 db 13,10,13,10, "Enter 1st Number : $"
msg2 db 13,10, "Enter 2nd Number : $"
msg01 db 13,10,13,10, "Enter base Number : $"
msg02 db 13,10, "Enter power Number : $"
msgEr db 13,10, "Error $"
msgCh db 13,10, "Press A to ADD , S to SUBTRACT ,M to MULTIPLY, D to DIVIDE,F to FIND FACTORIAL,P to FIND X POWER Y, X to EXIT : $ "
msgSum db 13,10,13,10, "Sum is : $"
msgDif db 13,10,13,10, "Difference is : $"
msgDiv db 13,10,13,10, "Quotient is : $"
msgMul db 13,10,13,10, "Product is : $"
msgPOW db 13,10,13,10, "ANS is : $"
tmp db ?
.code
start:
mov ax, @data
mov ds, ax
lea dx, msgCh
mov ah, 09h
int 21h
mov ah, 1
mov dl, al
int 21h
cmp al,'d'
je dividing
cmp al,'a'
je adding
cmp al,'s'
je subtracting
cmp al,'m'
je multiplying
cmp al,'f'
je fact
cmp al,'p'
je x_pow_y
cmp al,'x'
mov ah, 4ch
int 21h
error:
lea dx,msgEr
mov ah,09h
int 21h
jmp start
;//////////////////////////////////////
dividing:
lea dx, msg1
mov ah, 9
int 21h
start1:
mov ah, 1
int 21h
cmp al,0dh
je next1
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start1
next1:
push bx
lea dx,msg2
mov ah,09h
int 21h
mov bx,0
start2:
mov ah,1
int 21h
cmp al,0dh
je d
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start2
d:
pop ax
mov dx,0
div bx
push ax
lea dx,msgDiv
mov ah,09h
int 21h
pop ax
mov cx,0
mov dx,0
mov bx,10d
jmp break
;///////////////////////////////////
adding:
lea dx, msg1
mov ah, 9
int 21h
mov bx, 0
start01:
mov ah, 1
int 21h
cmp al,0dh
je next01
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start01
next01:
push bx
lea dx,msg2
mov ah,09h
int 21h
mov bx,0
start02:
mov ah,1
int 21h
cmp al,0dh
je a
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start02
a:
pop ax
add ax,bx
push ax
lea dx,msgSum
mov ah,09h
int 21h
pop ax
mov cx,0
mov dx,0
mov bx,10d
jmp break
;///////////////////////////////
multiplying:
lea dx, msg1
mov ah, 9
int 21h
mov bx, 0
start001:
mov ah, 1
int 21h
cmp al,0dh
je next001
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start001
next001:
push bx
lea dx,msg2
mov ah,09h
int 21h
mov bx,0
start002:
mov ah,1
int 21h
cmp al,0dh
je m
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start002
m:
pop ax
mov dx,0
mul bx
push ax
lea dx,msgMul
mov ah,09h
int 21h
pop ax
mov cx,0
mov dx,0
mov bx,10d
jmp break
;//////////////////////////////////
fact:
lea dx, msg1
mov ah, 9
int 21h
mov bx, 0
start003:
mov ah, 1
int 21h
cmp al,0dh
je l
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start003
l: ;ax=6
mov cx,bx
mov ax,1
jmp l2
l2:
cmp cx,0
je l1
mov dx,0
mul cx
push ax
lea dx,msgPOW
mov ah,09h
int 21h
sub cx,1
pop ax
jmp l2
l1:
mov dx,0
mov bx,10d
jmp break
;//////////////////////////////////////////////\\\\\\\\\\\\\\\\\\\\\\\
x_pow_y:
lea dx, msg01
mov ah, 9
int 21h
mov bx, 0
start004:
mov ah, 1
int 21h
cmp al,0dh
je next004
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start004
next004:
push bx
lea dx,msg02
mov ah,09h
int 21h
mov bx,0
start005:
mov ah,1
int 21h
cmp al,0dh
je p
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start005
p:
mov cx,bx
pop ax
mov bx,ax
mov dx,0
c:
cmp cx,1
je c1
mul bx
push ax
lea dx,msgPOW
mov ah,09h
int 21h
sub cx,1
pop ax
jmp c
c1:
mov cx,0
mov dx,0
mov bx,10d
jmp break
;/////////////////////////////// \\\\\\\\\\\\\\\\\\\\\ ' _ '
subtracting:
lea dx, msg1
mov ah, 9
int 21h
mov bx, 0
start0001:
mov ah, 1
int 21h
cmp al,0dh
je next0001
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start0001
next0001:
push bx
lea dx,msg2
mov ah,09h
int 21h
mov bx,0
start0002:
mov ah,1
int 21h
cmp al,0dh
je s
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start0002
s:
pop ax
sub ax,bx
push ax
lea dx,msgDif
mov ah,09h
int 21h
pop ax
mov cx,0
mov dx,0
mov bx,10d
break:
div bx
push dx
mov dx,0
inc cx
or ax,ax
jne break
ans:
pop dx
add dl,30h
mov ah,02h
int 21h
loop ans
jmp start
end start