TEXT SEGMENT
ASSUME CS:TEXT
X1: DB 13, 10, 'You Input a lowercase Letter! $'
X2: DB 13, 10, 'You Input a Uppercase Letter! $'
X3: DB 13, 10, 'You Input a Digit! $'
X4: DB 13, 10, 'You Input other Letter! $'
START:
MOV AX, TEXT
MOV DS, AX
MOV AH, 1
INT 21H
CMP AL, '0'
JB D_X4
CMP AL, '9'
JBE D_X3
CMP AL, 'A'
JB D_X4
CMP AL, 'Z'
JBE D_X2
CMP AL, 'a'
JB D_X4
CMP AL, 'z'
JBE D_X1
JMP D_X4
D_X1:
LEA DX, X1
JMP DISP
D_X2:
LEA DX, X2
JMP DISP
D_X3:
LEA DX, X3
JMP DISP
D_X4:
LEA DX, X4
DISP:
MOV AH, 9
INT 21H
EXIT:
MOV AH,4CH
INT 21H
TEXT ENDS
END START
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