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1、北京理工大学汇编上机试题和代码（修改版）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 BUF1 DB 0FFH DB ? DB 0FFH DUP(?) BUF2 DB 0DH,0AH,0FDH DUP(?) DATAS ENDSCODES SEGMENT ASSUME CS:CODES,DS:DATASSTART: MOV AX,DATAS MOV DS,AX LEA DX,BUF1 MOV AH,0AH INT 21H MOV AX,0 MOV AL,BUF11 LEA SI,BUF11 ADD SI,AX LEA DI,BUF22 MOV CX,0 MO
2、V CL,BUF11 L: MOV AL,SI MOV DI,AL DEC SI INC DI LOOP L MOV BYTE PTR DI,$ LEA DX,BUF2 MOV AH,09H INT 21H MOV AH,4CH INT 21HCODES ENDSEND START取巧：DATA SEGMENTDB 512 DUP($) ;定义可输入的字符个数BUF DB $DATA ENDSCODE SEGMENTASSUME CS:CODE,DS:DATASTART: MOV AX,DATA MOV DS,AXMOV BX,OFFSET BUF ;指针指向待显示字符串尾部AGAIN:MOV
3、 AH,01 ;输入字符INT 21HCMP AL,0DH ;是回车吗JE DISP ;是,转显示DEC BX ;指针减1MOV BX,AL ;存入输入的字符JMP AGAIN ;继续输入DISP:MOV DX,BX ;定位待显示字符串首地址MOV AH,09 INT 21H ;显示MOV AH,4CH ;DOS返回INT 21HCODE ENDSEND START2.请任意输入一个字符串，统计其中空格和A的个数，并将结果显示在屏幕上。DATA SEGMENTBUF DB 0FFH DB ? DB 0FFH DUP (?)OUTPUT DB 0DH,0AH, A =000 DB 0DH,0AH
4、,SPACE=000,$DATA ENDSCODE SEGMENTASSUME CS:CODE,DS:DATASTART:MOV AX,DATAMOV DS,AXLEA DX,BUFMOV AH,0AHINT 21HLEA SI,BUF2MOV CX,0MOV CL,BUF1L:CMP BYTE PTRSI,AJNE NOTACMP OUTPUT10,9JE CAR1INC OUTPUT10JMP NEXTCAR1:CMP OUTPUT9,9JE CAR2MOV OUTPUT10,0INC OUTPUT9JMP NEXTCAR2:MOV OUTPUT10,0MOV OUTPUT9,0INC O
5、UTPUT8JMP NEXTNOTA:CMP BYTE PTRSI, JNE NEXTCMP OUTPUT21,9JE CSR1INC OUTPUT21JMP NEXTCSR1:CMP OUTPUT20,9JE CSR2MOV OUTPUT21,0INC OUTPUT20JMP NEXTCSR2:MOV OUTPUT21,0MOV OUTPUT20,0INC OUTPUT19JMP NEXTNEXT:INC SILOOP LLEA DX,OUTPUTMOV AH,09HINT 21HMOV AX,4C00HINT 21HCODE ENDSEND3.请任意输入一个字符串，将其中的空格全部删除，并
6、将结果显示在屏幕上。DATA SEGMENTBUF1 DB 0FFH DB ? DB 0FFH DUP(?)BUF2 DB 0DH,0AH,0FDH DUP(?)DATA ENDSCODE SEGMENT ASSUME CS:CODE,DS:DATA START: MOV AX,DATA MOV DS,AX LEA DX,BUF1 MOV AH,0AH INT 21H MOV CX,0 MOV CL,BUF11 LEA SI,BUF12 LEA DI,BUF22 L: CMP BYTE PTR SI, JE M MOV AL,SI MOV DI,AL INC DI M: INC SI LOOP
7、 L MOV BYTE PTR DI,$ LEA DX,BUF2 MOV AH,09H INT 21H MOV AX,4C00H INT 21HCODE ENDSEND4.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 BUF DB 0FFH DB ? DB 0FFH DUP(?)DATA ENDSCODE SEGMENT ASSUME CS:CODE,DS:DATA START: MOV AX,DATA MOV DS,AX LEA DX,BUF MOV AH,0AH INT 21H MOV CX,0 MOV CL,BUF1 LEA SI,BUF2 L:
8、CMP BYTE PTR SI,A JNE M MOV BYTE PTR SI,B M: INC SI LOOP L MOV WORD PTR SI,0D0AH MOV BYTE PTR SI+2,$ LEA DX,BUF2 MOV AH,09H INT 21H MOV AX,4C00H INT 21HCODE ENDSEND5.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 BUF1 DB 0FFH DB ? DB 0FFH DUP(?) BUF2 DB 0DH,0AH,0FDH DUP(?) DATA ENDSCODE SEGMENT ASSUME
9、CS:CODE,DS:DATA START: MOV AX,DATA MOV DS,AX LEA DX,BUF1 MOV AH,0AH INT 21H MOV CX,0 MOV CL,BUF11 LEA SI,BUF12 LEA DI,BUF22 L: CMP BYTE PTR SI,A JNE M MOV WORD PTR DI,CC ADD DI,2 INC SI JMP N M: MOV AL,SI MOV DI,AL INC DI INC SI N: LOOP L MOV BYTE PTR DI,$ LEA DX,BUF2 MOV AH,09H INT 21H MOV AX,4C00H
10、 INT 21HCODE ENDSEND6.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 BUF1 DB 0FFH DB ? DB 0FFH DUP(?) BUF2 DB 0DH,0AH,0FDH DUP(?) DATA ENDSCODE SEGMENT ASSUME CS:CODE,DS:DATA START: MOV AX,DATA MOV DS,AX LEA DX,BUF1 MOV AH,0AH INT 21H MOV CX,0 MOV CL,BUF11 LEA SI,BUF12 LEA DI,BUF22 L: MOV AL,SI MO
11、V DI,AL CMP BYTE PTR DI,a JNB M OR BYTE PTR DI,00100000B M: INC DI INC SI N: LOOP L MOV BYTE PTR DI,$ LEA DX,BUF2 MOV AH,09H INT 21H MOV AX,4C00H INT 21HCODE ENDSEND7.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 BUF1 DB 0FFH DB ? DB 0FFH DUP(?) BUF2 DB 0DH,0AH,0FDH DUP(?) DATA ENDSCODE SEGMENT AS
12、SUME CS:CODE,DS:DATA START: MOV AX,DATA MOV DS,AX LEA DX,BUF1 MOV AH,0AH INT 21H MOV CX,0 MOV CL,BUF11 LEA SI,BUF12 LEA DI,BUF22 L: CMP BYTE PTR SI,A JNB M MOV AL,SI MOV DI,AL INC SI INC DI JMP NEXT M: CMP BYTE PTR SI,z JNA N MOV AL,SI MOV DI,AL INC SI INC DI JMP NEXT N: CMP BYTE PTR SI,a JB H INC SI JMP NEXT H: CMP BYTE PTR SI,Z JA O INC SI JMP NEXT O: MOV AL,SI MOV DI,AL INC SI
