怎么输入一个十六进制数
如何输入一个十六进制数？
目前只知道用0AH号功能将其当做字符串输入，但是要对其进行运算就很麻烦，如何直接输入一个十六进制数（不超过四位）？
------解决方案--------------------
无论你输入的是什么，cpu都把他转换成二进制存在内存中。我这里有一个早以前我的一个练习。你烟酒一下
目前只知道用0AH号功能将其当做字符串输入，但是要对其进行运算就很麻烦，如何直接输入一个十六进制数（不超过四位）？
------解决方案--------------------
无论你输入的是什么，cpu都把他转换成二进制存在内存中。我这里有一个早以前我的一个练习。你烟酒一下
- Assembly code
assume cs:code,ds:data,ss:stack
data segment
msg1 db 'Choice digit type:[1]Hex [2]Dec [3]Oct [4]Bin:$'
msg2 db 'Input switch type:[1]Hex [2]Dec [3]Oct [4]Bin:$'
msg3 db 'Input :$'
msg4 db 'Result:$'
var1 db 0
var2 db 0
buff db 16 dup (0)
error db 'Invalid number or Out of compass !$'
tab1 dw 10000,1000,100,10,1
tab2 dw 4096,512,64,8,1
tab3 dw 8000h,4000h,2000h,1000h,800h,400h,200h,100h,80h,
40h,20h,10h,8h,4h,2h,1h
sum dw 0
data ends
stack segment stack
dw 128 dup (0)
stack ends
code segment
start:
mov ax,data
mov ds,ax
;------------------------------------------------;
mov dx,offset msg1
mov ah,9
int 21h
mov ah,1
int 21h
cmp al,0dh
jz _err
cmp al,'1'
jb _err
cmp al,'4'
ja _err
mov var1,al
call crlf
;------------------------------------------------;
mov dx,offset msg2
mov ah,9
int 21h
mov ah,1
int 21h
cmp al,0dh
jz _err
cmp al,'1'
jb _err
cmp al,'4'
ja _err
mov var2,al
call crlf
;------------------------------------------------;
mov dx,offset msg3
mov ah,9
int 21h
;
cmp var1,31h
jz inhex
cmp var1,32h
jz indec
cmp var1,33h
jz inoct
cmp var1,34h
jz inbin
jmp _err
;------------------------------------------------;
;
;check hex-input
;
inhex:
mov cx,4
mov di,offset buff
_inhex:
mov ah,1
int 21h
cmp al,0dh
jz none
cmp al,'0'
jb _err
cmp al,'9'
ja d
; sub al,30h
jmp jx1
d:
cmp al,'A'
jb _err
cmp al,'F'
ja x
; sub al,37h
jmp jx1
x:
cmp al,'a'
jb _err
cmp al,'f'
ja _err
; sub al,57h
jx1:
mov [di],al
inc di
dec cx
jcxz ol1
jmp _inhex
ol1:
jmp a2h
;------------------------------------------------;
;
;check dec-input
;
indec:
mov si,0
mov cx,5
mov di,offset buff
_indec:
mov ah,1
int 21h
cmp al,0dh
jz ol2
cmp al,'0'
jb _err
cmp al,'9'
ja _err
sub al,30h
mov [di],al
inc di
inc si
dec cx
jcxz ol2
jmp _indec
ol2:
jmp d2h
;------------------------------------------------;
;check oct-input
;
inoct:
mov si,0
mov cx,5
mov di,offset buff
_inoct:
mov ah,1
int 21h
cmp al,0dh
jz ol3
cmp al,'0'
jb _err
cmp al,'8'
ja _err
sub al,30h
mov [di],al
inc di
inc si
dec cx
jcxz ol3
jmp _inoct
ol3:
jmp o2h
;------------------------------------------------;
;check bin-input
;
inbin:
mov si,0
mov cx,16
mov di,offset buff
_inbin:
mov ah,1
int 21h
cmp al,0dh
jz ol4
cmp al,'0'
jb _err
cmp al,'1'
ja _err
sub al,30h
mov [di],al
inc di
inc si
dec cx
jcxz ol4
jmp _inbin
ol4:
jmp b2h
;------------------------------------------------;
a2h:
mov cx,12
mov si,offset buff
xor dx,dx
load:
mov al,[si]
cmp al,0
jz ok1
inc si
cmp al,40h
jb sz
cmp al,47h
jb zd
cmp al,67h
jb zx
sz:
sub al,30h
mov ah,0
shl ax,cl
add dx,ax
sub cx,4
jmp a2hjx
zd:
sub al,37h
mov ah,0
shl ax,cl
add dx,ax
sub cx,4
jmp a2hjx
zx:
sub al,57h
mov ah,0
shl ax,cl
add dx,ax
sub cx,4
a2hjx:
cmp cx,0fffch
jz ok1
jmp load
ok1: push dx
jmp show
;------------------------------------------------;
d2h:
mov bx,offset buff
add bx,si
dec bx
mov di,offset tab1
add di,8
mov cx,si
shijia:
mov al,[bx]
xor ah,ah
mul word ptr [di]
add sum,ax
jc _err
sub di,2
dec bx
loop shijia
push word ptr sum
jmp show
;------------------------------------------------;
o2h:
mov bx,offset buff
add bx,si
dec bx
mov di,offset tab2
add di,8
mov cx,si
bajia:
mov al,[bx]
xor ah,ah
mul word ptr [di]
add sum,ax
jc _err
sub di,2
dec bx
loop bajia
push word ptr sum
jmp show
;------------------------------------------------;
b2h:
mov bx,offset buff
add bx,si
dec bx
mov di,offset tab3
add di,30
mov cx,si
erjia:
mov al,[bx]
xor ah,ah
mul word ptr [di]
add sum,ax
jc _err
sub di,2
dec bx
loop erjia
push word ptr sum
jmp show
;------------------------------------------------;
show: call crlf
mov dx,offset msg4
mov ah,9
int 21h
cmp var2,31h
jz _hex
cmp var2,32h
jz _dec
cmp var2,33h
jz _oct
cmp var2,34h
jz _bin
_hex:
pop dx
call disphex
jmp over
_dec:
pop dx
call dispdec
jmp over
_oct:
pop dx
call dispoct
jmp over
_bin:
pop dx
call dispbin
jmp over
;------------------------------------------------;
none:
cmp si,0
jz over
_err: call crlf
mov dx,offset error
mov ah,9
int 21h
over: mov ah,4ch
int 21h
;
crlf proc
mov ah,2
mov dl,0dh
int 21h
mov dl,0ah
int 21h
ret
crlf endp
;
err proc
mov dx,offset error
mov ah,9
int 21h
ret
err endp
;
disp proc
mov dx,offset msg4
mov ah,9
int 21h
ret
disp endp
;
;input:dx
disphex proc uses dx
mov cx,4
d1: push cx
mov cl,4
rol dx,cl
push dx
and dx,0fh
cmp dl,10
jb d10
add dl,37h
mov ah,2
int 21h
jmp jx2
d10: add dl,30h
mov ah,2
int 21h
jx2: pop dx
pop cx
loop d1
mov dl,'H'
mov ah,2
int 21h
call crlf
ret
disphex endp
;
;input:dx
dispdec proc uses dx
mov ax,dx
xor dx,dx
mov bx,10
mov cx,0
d2: cmp ax,10
jb ok2
div bx
add dl,30h
push dx
xor dx,dx
inc cx
jmp d2
ok2: add al,30h
push ax
inc cx<F12>
d3: pop dx
mov ah,2
int 21h
loop d3
mov dl,'D'
mov ah,2
int 21h
call crlf
ret
dispdec endp
;
;input:dx
dispoct proc uses dx
mov bx,8
mov cx,0
mov ax,dx
xor dx,dx
d3: cmp ax,8
jb ok3
div bx
add dl,30h
push dx
xor dx,dx
inc cx
jmp d3
ok3: add al,30h
push ax
inc cx
d4: pop dx
mov ah,2
int 21h
loop d4
mov dl,'Q'
mov ah,2
int 21h
call crlf
ret
dispoct endp
;
;input:dx
dispbin proc
mov cx,16
mov ax,dx
xor dx,dx
d5: rol ax,1
adc dl,0
push ax
add dl,30h
mov ah,2
int 21h
xor dx,dx
pop ax
loop d5
mov dl,'B'
mov ah,2
int 21h
ret
dispbin endp
;
code ends
end start