I/O:Unit1

 编程，从键盘读入学生成绩(0~100分)，共15名学生，计算并显示总分、平均成绩、单的学生成绩

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  1 ;03 47 86 91 72 55 93 88 83 79 61 78 85 90 10         sum:1021 avg:68
  2 DATA1    SEGMENT
  3         STU     DB  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
  4         SUM     DW  0
  5         BUF     DB  0,0,0,0
  6         AVG     DB  0
  7         COUNT   EQU 15
  8         TIMES   EQU 4 
  9         BASE    DB 10
 10 DATA1    ENDS
 11 
 12 CODE SEGMENT
 13 MAIN PROC FAR
 14         ASSUME CS:CODE,DS:DATA1
 15         
 16 START:
 17         MOV AX,DATA1
 18         MOV DS,AX
 19         
 20         MOV CX,COUNT
 21         MOV BX,OFFSET STU
 22         MOV DL,10
 23 LOOP1:  MOV DH,0
 24         MOV AH,1         ;读入数据
 25         INT 21H          
 26         SUB AL,48
 27         MUL [BASE]        
 28         ADD DH,AL
 29         MOV AH,1
 30         INT 21H
 31         SUB AL,48
 32         ADD DH,AL  
 33         MOV [BX],DH
 34         MOV AH,1
 35         INT 21H
 36         INC BX
 37         LOOP LOOP1 
 38         
 39         MOV DL,0DH      ;换行
 40         MOV AH,2
 41         INT 21H
 42         MOV DL,0AH
 43         MOV AH,2
 44         INT 21H
 45         
 46         MOV CX,COUNT
 47         MOV BX,OFFSET STU 
 48         MOV AL,0
 49         MOV AH,0
 50         CLC
 51 LOOP2:  ADD AL,[BX]      
 52         ADC AH,0
 53         INC BX
 54         LOOP LOOP2
 55         
 56         MOV SUM,AX;      
 57         MOV CL,COUNT     
 58         DIV CL           
 59         MOV AVG,AL       
 60                                
 61         MOV CX,COUNT        ;输出分数
 62         MOV BX,OFFSET STU 
 63 LOOP3:  MOV AH,0
 64         MOV AL,[BX]
 65         DIV [BASE]
 66         MOV DL,AL
 67         MOV DH,AH
 68         ADD DL,48
 69         MOV AH,2      ;会影响AL中的数据
 70         INT 21H
 71         MOV DL,DH
 72         ADD DL,48
 73         MOV AH,2
 74         INT 21H
 75         MOV DL,32
 76         MOV AH,2
 77         INT 21H   
 78         INC BX
 79         LOOP LOOP3
 80         
 81         MOV DL,0DH      ;换行
 82         MOV AH,2
 83         INT 21H
 84         MOV DL,0AH
 85         MOV AH,2
 86         INT 21H 
 87         
 88         
 89         MOV CX,TIMES    ;获取总数逐位
 90         MOV BX,OFFSET BUF
 91         MOV AX,[SUM]
 92 LOOP4:  DIV [BASE]
 93         MOV [BX],AH
 94         INC BX
 95         MOV AH,0
 96         LOOP LOOP4
 97         
 98         MOV DL,115  ;显示sum
 99         MOV AH,2
100         INT 21H 
101         MOV DL,117
102         MOV AH,2
103         INT 21H
104         MOV DL,109
105         MOV AH,2
106         INT 21H
107         
108         MOV CX,TIMES    ;显示总数 
109 NEXT1:  DEC BX          ;去前导0
110         DEC CX
111         MOV DL,[BX] 
112         CMP DL,0
113         JE NEXT1
114         
115         INC BX
116         INC CX
117         
118 LOOP5:  DEC BX
119         MOV DL,[BX]
120         ADD DL,48
121         MOV AH,2
122         INT 21H
123         LOOP LOOP5
124         
125         MOV DL,0DH      ;换行
126         MOV AH,2
127         INT 21H
128         MOV DL,0AH
129         MOV AH,2
130         INT 21H 
131         
132         
133         MOV DL,97
134         MOV AH,2
135         INT 21H
136         MOV DL,118
137         MOV AH,2
138         INT 21H
139         MOV DL,103
140         MOV AH,2
141         INT 21H
142         
143         MOV AH,0
144         MOV AL,[AVG]    ;显示平均数
145         DIV [BASE]
146         MOV DL,AL
147         MOV DH,AH
148         ADD DL,48
149         MOV AH,2
150         INT 21H
151         
152         MOV DL,DH
153         ADD DL,48
154         MOV AH,2
155         INT 21H
156         
157 MAIN    ENDP
158 CODE    ENDS
159         END START
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