NAME TURN
DSEG SEGMENT
A DB 'PLEASE INPUT (a~z):','$'
B DB 0AH,0DH,'$'
DSEG ENDS
SSEG SEGMENT STACK
DB 90H DUP(?)
SSEG ENDS
CSEG SEGMENT
ASSUME CS:CSEG,DS:DSEG,SS:SSEG
START:
MOV AX,DSEG
MOV DS,AX
MOV DX,OFFSET A///提示输入
MOV AH,09H
INT 21H
MOV AH,01H
INT 21H
MOV BL,AL
SUB BL,20H///转换
MOV DX,OFFSET B
MOV AH,09H
INT 21H
MOV DL,BL
MOV AH,02
INT 21H//输出
MOV AH,4CH
INT 21H/////结束
CSEG ENDS
END START
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