汇编第四章作业

喜欢ヅ旅行 2023-10-03 20:27 37阅读 0赞

> 《微机原理与接口技术》(第四版)周何琴

1.  编程实现:在显示器上显示全部标准和扩展ASCII码(其编码为00~FFH)字符。(参考例4.33。)

CODE  SEGMENT
          ASSUME CS:DODE
    START:
        MOV CX,0FFH
        MOV AL,00H
    LOOP1:
        MOV DL,AL
        MOV AH,02H
        INT 21H
        INC AL
        LOOP LOOP1 
    
        MOV AH,4CH
        INT 21H
    CODE ENDS
    END START

1.  编程实现:从键盘输入一个十进制数字0~9,查表求键入数字的七段代码，存入DL中,并在键入数字之前,显示提示信息“Please input a number:”。(参考例4.34。)

DATA SEGMENT
    TABLE DB 40H,79H,24H,30H,19H
          DB 12H,02H,78H,00H,18H
    PROMPT DB 'Please input a number:','$'
    DATA ENDS  
    
    CODE SEGMENT
    ASSUME CS:CODE,DS:DATA,SS:STACK,ES:DATA
    START: 
    PUSH DS
    MOV AX,DATA
    MOV DS,AX
    MOV DX,OFFSET PROMPT
    MOV AH,09H
    INT 21H
    MOV AH,1
    INT 21H
    AND AL,0FH
    MOV BX,OFFSET TABLE 
    XLAT
    MOV DL,AL
    POP DS
    HLT
    CODE ENDS
    END START

1.  某个学生的英语成绩已存放在BL中,如果低于60分,则显示F(Fail),如高于或等于85分,则显示G (Good),否则显示P(Pass),试编写完整的汇编语言程序来实现。(程序流程见图4.8。)

MOV AL,66
    CMP AL,85
    JAE GOOD
    CMP AL,60
    JAE PASS
    JB  FAIL
    
    GOOD:
        MOV DL,'G'
        JMP OVER   
    PASS:
        MOV DL,'P'
        JMP OVER
    FAIL:
        MOV DL,'F'
        JMP OVER   
    OVER:
        MOV AH,02H
        INT 21H

1.  在TABLE开始的内存宇节单元中,存放了12个带符号数,试编写完整的汇编语言程序统计其中的正数、负数和零的个数，分别存入PLUS.NEG 和ZERO单元中。(参考例3.89。

DATAS SEGMENT  
        CAT DB 0AH,0DH,"$";
        msg1 DB "positive: ","$"
        msg2 DB "negative: ","$"
        msg3 DB "zero     : ","$"
        TABLE DB 1,2,-3,4,5,0,-6,7,-8,-9,0,10
    DATAS ENDS
     
    STACKS SEGMENT
     STACKS ENDS
     
    CODES SEGMENT
        ASSUME CS:CODES,DS:DATAS,SS:STACKS
    START:
        MOV AX,DATAS
        MOV DS,AX
        MOV SI,OFFSET TABLE
        MOV CL,0
        MOV CH,0
        MOV BH,0
        MOV BL,0
        
    AGAIN:
        CMP CL,12
         JE OVEROUTPUT
        MOV AL,[SI]
        CMP AL,0H
         JZ ZERO
         JS NEGATIVE
         JMP POSITIVE
     
    ZERO:
     ADD CH,1
     JMP over
    NEGATIVE:
     ADD BL,1
     JMP over
    POSITIVE:
     ADD BH,1
     JMP over
        
    OVER:
     ADD CL,1
     ADD SI,1
     JMP again
         
    OVEROUTPUT:
     LEA DX, msg1                            
        MOV AH, 09H        
        INT 21H
        
        add BH,48
        mov DL,BH
        mov AH,2
        int 21H
        
        LEA DX, CAT                                   
        MOV AH, 09H        
        INT 21H
        
        LEA DX, msg2                          
        MOV AH, 09H        
        INT 21H
        
        add BL,48
        mov DL,bl
        mov AH,2
        int 21H
        
        LEA DX, CAT                                   
        MOV AH, 09H        
        INT 21H
        
        LEA DX, msg3                                   
        MOV AH, 09H        
        INT 21H
        
        add CH,48
        mov DL,CH
        mov AH,2
        int 21H
        
        LEA DX, CAT                                   
        MOV AH, 09H        
        INT 21H
        
        MOV AH,4CH
        INT 21H
    CODES ENDS
        END START