输入一个32767~-32767之间的一个10进制有符号数后以16进制形式输出

 

1 STA SEGMENT STACK
2 DW 60H DUP(?)
3 TOP LABEL WORD
4 STA ENDS
5
6 DATA SEGMENT
7
8 CRLF DB 0DH,0AH,24H
9
10 DATA ENDS
11
12 CODE SEGMENT
13
14 ASSUME CS: CODE, SS: STA, DS: DATA
15
16 MAIN PROC FAR
17 MOV AX,STA
18 MOV SS,AX
19 LEA SP,TOP
20 MOV AX,DATA
21 MOV DS,AX
22
23 MOV CX, 5
24 XOR BX,BX
25 MOV AH, 1
26 INT 21H
27 CMP AL,30H
28 JB L99
29 CMP AL,39H
30 JA L155
31
32
33 AND AX,0FH ; 0000 0000 0000 1111
34   XCHG AX,BX
35 MOV SI, 10
36 MUL SI
37 ADD BX,AX
38 MOV CX, 4
39   L100: MOV AH, 1
40 INT 21H
41 CMP AL,0DH
42 JE L82
43 CMP AL,30H
44 JB L100
45 CMP AL,39H
46 JA L100
47
48 AND AX,0FH ; 0000 0000 0000 1111
49 XCHG AX,BX
50 MOV SI, 10
51 MUL SI
52 ADD BX,AX
53 LOOP L100
54
55 L82:
56 JMP L20
57
58
59
60 L99: CMP AL, ' + '
61 JE L10 ; 跳到整数部分
62
63 CMP AL, ' - '
64 JE L11
65
66 L155: JMP L15
67
68 L10:
69 MOV AH, 1
70 INT 21H
71 CMP AL,0DH
72 JE L12
73 CMP AL,30H
74 JB L10
75 CMP AL,39H
76 JA L10
77
78 AND AX,0FH ; 0000 0000 0000 1111
79 XCHG AX,BX
80 MOV SI, 10
81 MUL SI
82 ADD BX,AX
83 LOOP L10
84
85 L12:
86 JMP L20
87
88 L11:
89
90 MOV AH, 1
91 INT 21H
92 CMP AL,0DH
93 JE L19
94 CMP AL,30H
95 JB L11
96 CMP AL,39H
97 JA L11
98
99 AND AX,0FH ; 0000 0000 0000 1111
100 XCHG AX,BX
101 MOV SI, 10
102 MUL SI
103 ADD BX,AX
104 LOOP L11
105
106 L19: NEG BX
107 JMP L20
108
109 L20:
110 MOV AH, 9
111 LEA DX,CRLF
112 INT 21H
113 MOV CX, 4
114 L23:
115 MOV DL,30H
116 PUSH CX
117 MOV CL, 4
118 ROL BX,CL
119 MOV AL,BL
120 AND AL,0FH
121 CMP AL, 9
122 JNA L24
123 ADD AL, 7
124 L24:
125 ADD DL,AL
126 MOV AH, 2
127 INT 21H
128 POP CX
129 LOOP L23
130 L15:
131 MOV AH,4CH
132 INT 21H
133 MAIN ENDP
134 CODE ENDS
135 END MAIN
136
137
138
139
140

 

转载于:https://www.cnblogs.com/SCAU_que/articles/1716564.html