北京理工大学汇编语言练习题及答案1.doc

一、
1. 请任意输入一个字符串，将该串倒序后在屏幕上显示。

DATAS SEGMENT
BUF DB 40
DB ?
DB 40 DUP(0)
ACC DB 0
CHAR DB ?
DATAS ENDS

STACKS SEGMENT
DB 100 DUP(0)
STACKS ENDS

CODES SEGMENT
ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
MOV AX,DATAS
MOV DS,AX

MOV AH,0AH
LEA DX,BUF
INT 21H ; 输入字符串

MOV AH,0EH
MOV AL,0DH
INT 10H
MOV AL,0AH
INT 10H ;回车换行

LEA SI,BUF
MOV AL,[SI+1]
MOV AH,0
MOV ACC,AL
INC SI
ADD SI,AX

L1: MOV DL,[SI]
MOV AH,02H
INT 21H
DEC SI
DEC ACC
CMP ACC,0
JNZ L1

MOV AH,4CH
INT 21H
CODES ENDS
END START

2. 请任意输入一个字符串，统计其中空格和A的个数，并将结果显示在屏幕上。

DATA SEGMENT
BUF DB 100
DB ?
DB 100 DUP(?)
CHAR DB 0
ACC DB 0
SPACE DB 0
CHARA DB 0
DATA ENDS
STACK SEGMENT
DB 100 DUP(0)

STACK ENDS
CODE SEGMENT
ASSUME DS:DATA,CS:CODE
MAIN PROC FAR
MOV AX,DATA
MOV DS,AX

LEA DX,BUF
MOV AH,0AH
INT 21H ;输入字符串
MOV AH,02H
MOV DL,0DH
INT 21H
MOV DL,0AH
INT 21H

LEA SI,BUF
MOV AL,[SI+1]
MOV ACC,AL
MOV SI,2

L: CMP BUF[SI],' '
JZ LSPACE
CMP BUF[SI],'A'
JZ LCHARA
INC SI
DEC ACC
CMP ACC,0
JZ SHOW
JMP L

LSPACE:
INC SPACE
INC SI
DEC ACC
CMP ACC,0
JZ SHOW
JMP L
LCHARA:
INC CHARA
INC SI
DEC ACC
CMP ACC,0
JZ SHOW
JMP L

SHOW:
CMP SPACE,0AH
JAE SHOWS
ADD SPACE,30H
MOV DL,SPACE
MOV AH,2
INT 21H ;若SPACE小于10个，直接输出个数
SHOW1:
MOV AH,0EH
MOV AL,0DH
INT 10H
MOV AL,0AH
INT 10H

CMP CHARA,0AH
JAE SHOWA

ADD CHARA,30H
MOV AH,2
MOV DL,CHARA
INT 21H ;若A个数小于10，直接输出个数
JMP EXIT

SHOWS:
MOV AL,SPACE
MOV AH,0
MOV DL,10
DIV DL
ADD AH,30H
MOV SPACE,AH
ADD AL,30H
MOV AH,2
MOV DL,AL
INT 21H
MOV DL,SPACE
INT 21H
JMP SHOW1
SHOWA:
MOV AL,CHARA
MOV AH,0
MOV DL,10
DIV DL
ADD AH,30H
MOV CHARA,AH
ADD AL,30H
MOV AH,2
MOV DL,AL
INT 21H
MOV DL,CHARA
INT 21H

EXIT:
MOV AH,4CH
INT 21H
MAIN ENDP
CODE ENDS
END MAIN

3. 请任意输入一个字符串，将其中的空格全部删除，并将结果显示在屏幕上。

DATA SEGMENT
BUF DB 100
DB ?
DB 100 DUP(?)
INP DB 'Please input a string:','$'
CHAR DB 0
ACC DB 0
DATA ENDS
STACK SEGMENT
DB 100 DUP(0)
STACK ENDS
CODE SEGMENT
ASSUME DS:DATA,CS:CODE,ES:STACK
START:
MOV AX,DATA
MOV DS,AX ; 赋初值

MOV AH,09H
LEA DX,INP
INT 21H ; 提示输入

MOV AH,0AH
LEA DX,BUF
INT 21H ; 输入字符串
MOV AH,2
MOV DL,0DH
INT 21H
MOV DL,0AH
INT 21H ; 回车换行

LEA SI,BUF
MOV DL,[SI+1]
MOV ACC,DL
MOV SI,2
LOP:
MOV DL,BUF[SI]
MOV CHAR,DL
CMP CHAR,' '
JZ LADD
MOV AH,2
MOV DL,CHAR
INT 21H ;若不是空格则输出
LADD:
INC SI
DEC ACC
CMP ACC,0
JZ EXIT
JMP LOP
EXIT:
MOV AH,4CH
INT 21H
CODE ENDS
END START

4. 请任意输入一个字符串，将其中A换成B，并将结果显示在屏幕上。

DATA SEGMENT
INP DB 'Please input a string:','$'
CHAR DB 0
ACC DB 0
BUF DB 50
DB ?
DB 50 DUP(0)
DATA ENDS
STACK SEGMENT
DB 100 DUP(0)
STACK ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:
MOV AX,DATA
MOV DS,AX

MOV AH,9
LEA DX,INP
INT 21H ;提示输入字符串

MOV AH,0AH
LEA DX,BUF
INT 21H
MOV AH,2
MOV DL,0DH
INT 21H
MOV DL,0AH
INT 21H ;输入字符串

LEA SI,BUF
MOV DL,[SI+1]
MOV ACC,DL ;记录字符串个数

MOV SI,2
MOV AH,2
LA: MOV DL,BUF[SI]
CMP DL,'A'
JZ PUTCC
INT 21H
LAD:INC SI
DEC ACC
MOV DH,ACC
CMP DH,0
JZ EXIT
JMP LA
PUTCC:
MOV DL,'C'
INT 21H
INT 21H
JMP LAD
EXIT:
MOV AH,4CH
INT 21H
CODE ENDS
END START

5. 请任意输入一个字符串，将其中A换成CC，并将结果显示在屏幕上。

DATA SEGMENT
INP DB 'Please input a string:','$'
CHAR DB 0
ACC DB 0
BUF DB 50
DB ?
DB 50 DUP(0)
DATA ENDS
STACK SEGMENT
ASSUME CS:CODE,DS:DATA
START:
MOV AX,DATA
MOV DS,AX

MOV AH,9
LEA DX,INP
INT 21H ;提示输入字符串

MOV AH,0AH
LEA DX,BUF
INT 21H
MOV AH,2
MOV DL,0DH
INT 21H
MOV DL,0AH
INT 21H ;输入字符串

LEA SI,BUF
MOV DL,[SI+1]
MOV ACC,DL ;记录字符串个数

MOV SI,2
MOV AH,2
LA: MOV DL,BUF[SI]
CMP DL,'A'
JZ PUTCC
INT 21H
LAD:INC SI
DEC ACC
MOV DH,ACC
CMP DH,0
JZ EXIT
JMP LA
PUTCC:
INT 21H
INT 21H
JMP LAD
EXIT:
MOV AH,4CH
INT 21H
CODE ENDS
END START

6. 请任意输入一个字符串，将其中大写字母换成小写字母，并将结果显示在屏幕上。

DATA SEGMENT
INP DB 'Please input a string:','$'
CHAR DB 0
ACC DB 0
BUF DB 50
DB ?
DB 50 DUP(0)
DATA ENDS
STACK SEGMENT
DB 100 DUP(0)
STACK ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:
MOV AX,DATA
MOV DS,AX

MOV AH,9
LEA DX,INP
INT 21H ;提示输入字符串

MOV AH,0AH
LEA DX,BUF
INT 21H
MOV AH,2
MOV DL,0DH
INT 21H
MOV DL,0AH
INT 21H ;输入字符串

LEA SI,BUF
MOV DL,[SI+1]
MOV ACC,DL ;记录字符串个数

MOV SI,2
MOV AH,2
LA: MOV DL,BUF[SI]
CMP DL,'A'
JB PUT
CMP DL,'Z'
JBE PUTCHG
PUT:INT 21H
JMP LAD
PUTCHG:
ADD DL,32
INT 21H
LAD:INC SI
DEC ACC
MOV DH,ACC
CMP DH,0
JZ EXIT
JMP LA
EXIT:
MOV AH,4CH
INT 21H
CODE ENDS
END START

7. 请任意输入一个字符串，将其中的英文字母全部删除，并将结果显示在屏幕上。

DATA SEGMENT
INP DB 'Please input a string:','$'
CHAR DB 0
ACC DB 0
BUF DB 50
DB ?
DB 50 DUP(0)
DATA ENDS
STACK SEGMENT
DB 100 DUP(0)
STACK ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:
MOV AX,DATA
MOV DS,AX

MOV AH,9
LEA DX,INP
INT 21H ;提示输入字符串

MOV AH,0AH
LEA DX,BUF
INT 21H
MOV AH,2
MOV DL,0DH
INT 21H
MOV DL,0AH
INT 21H ;输入字符串

LEA SI,BUF
MOV DL,[SI+1]
MOV ACC,DL ;记录字符串个数

MOV SI,2
MOV AH,2
LA: MOV DL,BUF[SI]
CMP DL,'A'
JB PUT
CMP DL,'Z'
JBE LAD
CMP DL,'a'
JB PUT
CMP DL,'z'
JBE LAD
PUT:
INT 21H
JMP LAD
LAD:INC SI
DEC ACC
MOV DH,ACC
CMP DH,0
JZ EXIT
JMP LA

EXIT:
MOV AH,4CH
INT 21H
CODE ENDS
END START

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