匯編：將四位十進制數轉化為十六進制數

data segment
tital1 db Please input shi jin zi shu (example 1234): ,$
tital2 db It is transpranted into shi liu jin zi shu :,$
tital3 db Do you want to have a try again (yes "y",no "n"): ,$
tital4 db Welcome to use this program It is made by WQ 2012/5/17,$
kongzi db 0dh,0ah,$
jichun dw 0000h
yushu db 5 dup(00)
duandian db jianche dian,0dh,0ah,$
data ends
code segment
assume cs:code,ds:data
start:
mov ax,data
mov ds,ax

retry:
lea dx,kongzi ;換行回車
mov ah,09h
int 21h

lea dx,tital1 ;輸出抬頭1please input 1234
mov ah,09h
int 21h

mov al,0 ;初始化al

mov ah,01h ;輸入并回顯
int 21h

mov bh,al ;千位放在bh中保存


mov ah,01h
int 21h
mov bl,al ;百位放在bl中

mov ah,01h
int 21h
mov ch,al ;十位放在ch中


mov ah,01h
int 21h
mov cl,al ;個位放在cl中
;bh,bl,ch,cl 都沒問題


lea dx,kongzi ;換行回車
mov ah,09h
int 21h

lea dx,tital2 ;輸出抬頭2
mov ah,09h
int 21h

mov ax,0 ;初始化ax


sub bh,30h ;把ascII碼轉化為十進制數
mov al,bh ;輸入的第一個數（千位數）
;over

mov si,0ah ;10權值
mul si ;ax被乘1000 over
mul si
mul si
mov jichun,ax ;over