1 ;HtoD
2
3 data segment
4 n dw ?
5 data ends
6
7 stack segment
8 db 50 dup(?)
9 stack ends
10
11 code segment
12 assume cs:code,ss:stack,ds:data
13 start:mov ax,stack
14 mov ss,ax
15 mov sp,50
16 mov ax,data
17 mov ds,ax
18
19 mov si,10
20 mov di,10000
21 mov bx,0
22 mov cx,0
23 ;input the number which is lower than 6,5536,0000(65536(high)*10000(low))
24 s:mov ah,1
25 int 21h
26 cmp al,0dh ;when input '\n',quit
27 jz t
28 sub al,30h
29 mov ah,0
30 mov ds:[0],ax
31 ;high part
32 mov ax,bx
33 mul si
34 mov bx,ax
35 ;low part
36 mov ax,cx
37 mul si ;ax*10=dx_a
38 div di ;can't div 10000h(0000h~FFFFh) =ax(Shang)...dx(Yu)
39
40 add bx,ax ;high part
41 mov cx,dx ;low part
42 add cx,ds:[0] ;it won't JinWei , because
43 ;dx_ax=ax*10 , the last character of dx_ax value 0 ,
44 ;dx=dx_ax%10000 , the last character of dx is 0 ,
45 ;dx=dx+ds:[0](0~9) , the last character won't JinWei ,
46 ;thus cx won't JinWei
47 jmp s
48 t:mov ax,cx
49 mov dx,bx
50
51 cmp dx,0
52 jnz HtoD_dword
53 call HtoD_word
54
55 exit:mov ah,4ch
56 int 21h
57
58 HtoD_word:
59 mov bx,10 ;division
60 mov cx,0
61 mov dx,0 ;high part(dx_ax<10000)
62 u:div bx
63 push dx
64 mov dx,0
65 inc cx
66 cmp ax,0
67 jnz u
68
69 mov ah,2
70 v:pop dx ;dx<10
71 add dl,30h ;0->48 48
72 int 21h
73 loop v
74
75 ret
76
77 HtoD_dword:
78 push ax ;store low part
79 mov ax,dx
80 call HtoD_word
81 ;output '0'(low part must contain four character)
82 pop bx ;bx=low part
83 mov ah,2
84 mov dl,'0'
85 cmp bx,1000
86 ja w
87 int 21h
88 cmp bx,100
89 ja w
90 int 21h
91 cmp bx,10
92 ja w
93 int 21h
94
95 w:mov ax,bx ;ax=low part
96 call HtoD_word
97
98 jmp exit
99
100 code ends
101 end start
102
103 ;mov ax,432
104 ;call HtoD_word
105
106 ;mov ax,0
107 ;mov dx,1
108 ;call HtoD_dword
