masm匯編語言問題
將字串小寫變成大寫字母，雖然變成功了，但是在結果后為什么有大片亂碼？
DATAS SEGMENT
VAR DB 'This is assembly language'
VAR1 DB 50 DUP(?)
DATAS ENDS
STACKS SEGMENT
DB 128 DUP(?)
STACKS ENDS
CODES SEGMENT
ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
MOV AX,DATAS
MOV DS,AX
MOV CX,25
XOR DX,DX
LEA SI,VAR
LEA DI,VAR1
MOV AL,[SI]
L1:
MOV AL,[SI]
CMP AL,61h
JAE L2
MOV [DI],AL
INC SI
INC DI
LOOP L1
L2:
MOV AL,[SI]
CMP AL,7ah
JB L3
MOV [DI],AL
INC SI
INC DI
LOOP L1
L3:
SUB AL,20H
INC SI
MOV [DI],AL
INC DI
LOOP L1
LEA DX,VAR1
MOV AH,09H
INT 21H
MOV AH,4CH
INT 21H
CODES ENDS
END START
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