花了我这么长时间终于搞定了，实验10第三个，贴出来晒晒，不能白写了

415968430

亲测mov ax,12666显示绿色的12666

1. assume cs:code
   
2. 
   
3. data segment
   
4. db 10 dup (0)
   
5. data ends
   
6. 
   
7. stack segment
   
8. db 20h dup (0)
   
9. stack ends
   
10. 
    
11. code segment
    
12. start:
    
13. mov ax,12666
    
14. mov dx,0
    
15. mov bx,data
    
16. mov ds,bx
    
17. mov bx,stack
    
18. mov ss,bx
    
19. mov sp,20h
    
20. mov si,0
    
21. s1:mov cx,10
    
22. call dtoc;计算ax中每一位的数
    
23. jcxz s3
    
24. add cx,30h
    
25. mov ds:[si],cl
    
26. inc si
    
27. jmp s1
    
28. s3:call arund;将ds中的数掉头.si为要掉头的byte个数减1
    
29. 
    
30. 
    
31. 
    
32. 
    
33. 
    
34. s0:mov dh,8
    
35. mov dl,3
    
36. mov cl,2
    
37. call show_str;显示ds中的数
    
38. 
    
39. mov ax,4c00h
    
40. int 21h
    
41. 
    
42. 
    
43. arund:
    
44. mov bx,0
    
45. mov dh,0
    
46. e:mov cx,si
    
47. mov dl,ds:[bx]
    
48. push dx
    
49. inc bx
    
50. sub cx,bx
    
51. jcxz e0
    
52. jmp e
    
53. e0:mov cx,si
    
54. mov bx,0
    
55. e1:pop ax
    
56. mov ds:[bx],al
    
57. inc bx
    
58. loop e1
    
59. ret
    
60. 
    
61. 
    
62. 
    
63. dtoc:
    
64. push ax
    
65. mov ax,dx
    
66. mov dx,0
    
67. div cx
    
68. mov bx,ax;商放进bx中保存,余数在dx中正好为低16做除法时代高位
    
69. pop ax
    
70. div cx
    
71. mov cx,dx
    
72. mov dx,bx
    
73. ret
    
74. 
    
75. show_str:
    
76. dec dh
    
77. mov al,160
    
78. mul dh
    
79. mov bx,ax
    
80. dec dl
    
81. mov al,2
    
82. mul dl
    
83. add bx,ax
    
84. mov ax,0b800h
    
85. mov es,ax;段地址
    
86. mov di,bx;做偏移
    
87. mov bx,0
    
88. mov ah,cl
    
89. mov ch,0
    
90. s:mov cl,ds:[bx]
    
91. jcxz ok
    
92. mov es:[di],cl
    
93. mov es:[di+1],ah
    
94. inc bx
    
95. inc di
    
96. inc di
    
97. jmp s
    
98. ok:ret
    
99. 
    
100. code ends
     
101. end start
     

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415968430

其中那个arund是把ds掉头用的
源代码多了个dec si：

1. assume cs:code
   
2. 
   
3. data segment
   
4. db '1','2','3','4','5','6'
   
5. db 10 dup (0)
   
6. data ends
   
7. 
   
8. stack segment
   
9. db 30h dup (0)
   
10. stack ends
    
11. 
    
12. code segment
    
13. start:
    
14. mov ax,data
    
15. mov ds,ax
    
16. mov ax,stack
    
17. mov ss,ax
    
18. mov sp,30h
    
19. mov si,6 ;6个数,si为形参
    
20. dec si
    
21. mov bx,0
    
22. mov dh,0
    
23. e:mov cx,si
    
24. mov dl,ds:[bx]
    
25. push dx
    
26. inc bx
    
27. sub cx,bx
    
28. jcxz e0
    
29. 
    
30. jmp e
    
31. e0:mov cx,si
    
32. mov bx,0
    
33. e1:pop ax
    
34. mov ds:[bx],al
    
35. inc bx
    
36. loop e1
    
37. 
    
38. 
    
39. mov ax,4c00h
    
40. int 21h
    
41. code ends
    
42. end start

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