汇编语言实现小写转为大写

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法一：

DATA SEGMENT

MES1 DB 'Input:',0AH,0DH,'$'
MES2 DB 0AH,0DH,'Output:',0AH,0DH,'$'
XXX DB 10,?,10 DUP('$')
DATA ENDS

CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:
MOV AX,DATA
MOV DS,AX

LEA DX,MES1
MOV AH,9
INT 21H

INPUT: LEA DX,XXX
MOV AH,0AH
INT 21H

LEA DX,MES2
MOV AH,9
INT 21H

MOV CL,XXX+1
MOV CH,0
LEA BX,XXX+2
OUTPUT:
MOV DL,[BX]
SUB DL,20H
MOV AH,2
INT 21H
INC BX
LOOP OUTPUT

MOV AX,4C00H
INT 21H
CODE ENDS

END START

DATA SEGMENT
MES1 DB 'Input:',0AH,0DH,'$'
MES2 DB 0AH,0DH,'Output:',0AH,0DH,'$'
XXX DB 10,?,10 DUP('$')
DATA ENDS

法二：

CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:
MOV AX,DATA
MOV DS,AX

LEA DX,MES1
MOV AH,9
INT 21H

INPUT: LEA DX,XXX
MOV AH,0AH
INT 21H

LEA DX,MES2
MOV AH,9
INT 21H

MOV CL,XXX+1
MOV CH,0
LEA BX,XXX+2
OUTPUT:
MOV DX,[BX]
SUB DX,20H
MOV [BX],DX
INC BX
LOOP OUTPUT

LEA DX,XXX+2
MOV AH,9
INT 21H

MOV AX,4C00H
INT 21H
CODE ENDS
END START

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