汇编语言学习记录

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

汇编语言学习记录

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