北京理工大学汇编语言练习题及答案

1、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 ENDSSTACKS SEGMENT DB 100 DUP(0)STACKS ENDSCODES SEGMENT ASSUME CS:CODES,DS:DATAS,SS:STACKSSTART: 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 1

2、0H ;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 21HCODES ENDS END START2. 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 SEGMENTBUF DB 100 DB ? DB 100 DUP(?)CHAR DB 0ACC DB 0SPACE DB 0CHARA DB 0DATA ENDSSTAC

3、K SEGMENTDB 100 DUP(0)STACK ENDSCODE SEGMENTASSUME DS:DATA,CS:CODEMAIN 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 BUFSI, JZ LSPACE CMP BUFSI,A JZ LCHARA INC SI DEC ACC CMP ACC,

4、0 JZ SHOW JMP L LSPACE: INC SPACE INC SI DEC ACC CMP ACC,0 JZ SHOW JMP LLCHARA: 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 SHOW

5、A 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 EXITSHOWS: 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 SHOW1SHOWA: MOV AL,CHARA MOV AH,0 MOV DL,10 DIV DL ADD AH,30H MOV CHARA,AH ADD AL,30H MOV AH,2 M

6、OV DL,AL INT 21H MOV DL,CHARA INT 21H EXIT: MOV AH,4CH INT 21HMAIN ENDP CODE ENDS END MAIN3. 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 SEGMENTBUF DB 100 DB ? DB 100 DUP(?)INP DB Please input a string:,$CHAR DB 0ACC DB 0DATA ENDSSTACK SEGMENTDB 100 DUP(0)STACK ENDSCODE SEGMENTASSUME DS:DATA,CS:CODE,ES:ST

7、ACKSTART:MOV AX,DATAMOV DS,AX ; 赋初值MOV AH,09HLEA DX,INPINT 21H ; 提示输入MOV AH,0AHLEA DX,BUFINT 21H ; 输入字符串MOV AH,2MOV DL,0DHINT 21HMOV DL,0AHINT 21H ; 回车换行LEA SI,BUFMOV DL,SI+1MOV ACC,DL MOV SI,2 LOP: MOV DL,BUFSI 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 AC

8、C CMP ACC,0 JZ EXIT JMP LOP EXIT: MOV AH,4CH INT 21H CODE ENDS END START4. 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 SEGMENTINP DB Please input a string:,$CHAR DB 0ACC DB 0BUF DB 50 DB ? DB 50 DUP(0)DATA ENDSSTACK SEGMENTDB 100 DUP(0)STACK ENDSCODE SEGMENTASSUME CS:CODE,DS:DATASTART: MOV AX,DATA MOV DS,AX

9、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,2LA: MOV DL,BUFSI CMP DL,A JZ PUTCC INT 21HLAD:INC SI DEC ACC MOV DH,ACC CMP DH,0 JZ EXIT JMP LAPUTCC: MOV DL,C INT 21H

10、INT 21H JMP LADEXIT: 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 SEGMENTINP DB Please input a string:,$CHAR DB 0ACC DB 0BUF DB 50 DB ? DB 50 DUP(0)DATA ENDSSTACK SEGMENTASSUME CS:CODE,DS:DATASTART: MOV AX,DATA MOV DS,AX MOV AH,9 LEA DX,INP INT 21H ;提示输入字符串 MOV AH,0A

11、H 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,2LA: MOV DL,BUFSI CMP DL,A JZ PUTCC INT 21HLAD:INC SI DEC ACC MOV DH,ACC CMP DH,0 JZ EXIT JMP LAPUTCC: INT 21H INT 21H JMP LADEXIT: MOV AH,4CH INT 21H CODE ENDS END S

12、TART 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 SEGMENTINP DB Please input a string:,$CHAR DB 0ACC DB 0BUF DB 50 DB ? DB 50 DUP(0)DATA ENDSSTACK SEGMENTDB 100 DUP(0)STACK ENDSCODE SEGMENTASSUME CS:CODE,DS:DATASTART: 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 IN

13、T 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,2LA: MOV DL,BUFSI CMP DL,A JB PUT CMP DL,Z JBE PUTCHGPUT:INT 21H JMP LADPUTCHG: ADD DL,32 INT 21HLAD:INC SI DEC ACC MOV DH,ACC CMP DH,0 JZ EXIT JMP LAEXIT: MOV AH,4CH INT 21H CODE E

14、NDS 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 SEGMENTINP DB Please input a string:,$CHAR DB 0ACC DB 0BUF DB 50 DB ? DB 50 DUP(0)DATA ENDSSTACK SEGMENTDB 100 DUP(0)STACK ENDSCODE SEGMENTASSUME CS:CODE,DS:DATASTART: 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