汇编语言学习记录

2023-06-03 09:21| 来源: 网络整理| 查看: 265

汇编语言编程学习，记录相关问题和程序如何编写

内存有一个字节变量VAL中存放着小写字符’a’，请将该字符转换为大写字符并在屏幕中显示出来

DATA SEGMENT VAL DB 'a' DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX MOV AL,VAL SUB AL,20H MOV AH,02H INT 21H MOV AH,4CH INT 21H CODE ENDS END START

设存储单元A和B各有一带符号字节数，比较大小和正负，要求将较大数送RES1单元；如果有负数，将一个负数送RES2，否则RES2送-1

DATA SEGMENT A DB 1 B DB -2 RES1 DB ? RES2 DB ? DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX MOV AL,A MOV BL,B CMP AL,BL JE NEXT1 MOV RES1,BL MOV CL,AL JMP NEXT2 NEXT1:MOV RES1,AL MOV CL,BL NEXT2:CMP CL,0 JG NEXT3 MOV RES2,-1 JMP NEXT4 NEXT3:MOV RES2,CL NEXT4:MOV AH,4CH INT 21H CODE ENDS END START

在STR到STR+99单元中存放着一个字符串，试编写程序测试该字符串中是否有数字，若有将CL置1，否则CL置0

DATA SEGMENT STR DB 'AB123CDEFGHIJKLMNOPQRSTUVWXYZ1234ABCDEFGHIJKLMNOPQRSTUVWXYZ1234ABCDEFGHIJKLMNOPQRSTUVWXYZ1234ABCDEFG' DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX MOV BX,OFFSET STR MOV CX,100 LP:MOV AL,[BX] CMP AL,48 JB NO CMP AL,57 JA NO MOV CL,1 JMP EXIT NO:INC BX LOOP LP MOV CL,0 EXIT:MOV AH,4CH INT 21H CODE ENDS END START

在字节数组中找出第一个负数，并将该负数存入RES单元中；假设该数组中包含20个带符号数，且至少有1个负数

DATA SEGMENT ARR DB 1,-2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 RES DB ? DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX MOV CX,20 MOV DI,-1 LP:INC DI CMP ARR[DI],0 JL EXIT LOOP LP EXIT:MOV AL,ARR[DI] MOV RES,AL MOV AH,4CH INT 21H CODE ENDS END START

用冒泡法完成排序任务

DATA SEGMENT A DW 12,34,6,3,45,43 CNT EQU ($-A)/2 DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX MOV CX,CNT-1 LP1:XOR SI,SI XOR DI,DI LP2:MOV AX,A[SI] MOV BX,A[SI+2] CMP AX,BX JL LP3 MOV A[SI],BX MOV A[SI+2],AX LP3:ADD SI,2 INC DI CMP DI,CX JB LP2 LOOP LP1 MOV AH,4CH INT 21H CODE ENDS END START

试编写一个汇编程序，能对键盘输入的小写字母用大写字母显示出来（要求采用子程序格式，即采用子程序完成将小写字母转化成大写字母）

DATA SEGMENT DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX MOV AH,1 INT 21H CALL SUBT MOV DL,AL MOV AH,2 INT 21H MOV AH,4CH INT 21H SUBT PROC NEAR SUB AL,20H RET SUBT ENDP CODE ENDS END START

有2个数组：

ary1 db 12,-35,0,126,-90,-5,68,120,1,-19

ary2 db 24,25,0,-38,-89,99,68,100,2,-20

比较两个数组的对应位，将大的数放在ary1数组中，小的数放在ary2中

DATA SEGMENT ARY1 DB 12,-35,0,126,-90,-5,68,120,1,-19 ARY2 DB 24,25,0,-38,-89,99,68,100,2,-20 DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX MOV CX,10 LEA SI,ARY1 LEA DI,ARY2 CALL SUBT MOV AH,4CH INT 21H SUBT PROC LP:MOV AX,[SI] MOV DX,[DI] CMP AX,DX JG NEXT MOV [SI],DX MOV [DI],AX NEXT:INC SI INC DI LOOP LP RET SUBT ENDP CODE ENDS END START

用DOS的10号功能调用输入一个字符串，并用DOS的9号功能调用将这个字符串输出到屏幕上显示

DATA SEGMENT STR DB 20,20 DUP('$') DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START:MOV AX,DATA MOV DS,AX MOV AH,10 LEA DX,STR INT 21H MOV BYTE PTR STR+0,10 MOV BYTE PTR STR+1,13 MOV AH,9 INT 21H MOV AH,4CH INT 21H CODE ENDS END START

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汇编语言学习记录

汇编语言学习记录

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