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.MODEL SMALL
.STACK 100H
.DATA
M1 DB 'Enter DECIMAL:$'
M2 DB 'DECIMAL is:$' 
.CODE
MAIN PROC
            
    MOV AX,@DATA
MOV DS,AX         
            
    CALL INDEC
    PUSH AX
    
    MOV AH,2
    MOV DL,0DH
    INT 21H
    MOV DL,0AH
    INT 21H
    
    POP AX
    CALL OUTDEC
    
    MOV AH,4CH
    INT 21H
    
    MAIN ENDP

   INDEC PROC
    
    PUSH BX
    PUSH CX
    PUSH DX 
    
    BEGIN:
    
    LEA DX,M1
MOV AH,9
INT 21H
    
    XOR BX,BX
    XOR CX,CX
    
    MOV AH,1
    INT 21H
    
    CMP AL,'-'
    JE MINUS
    CMP AL,'+'
    JE PLUS
    
    JMP REPEAT2
    
    MINUS:
    MOV CX,1
    PLUS:
    INT 21H
    
    REPEAT2:
    CMP AL,'0'
    JNGE NOT_DIGIT
    CMP AL,'9'
    JNLE NOT_DIGIT
    
    AND AX,000FH
    PUSH AX
    
    MOV AX,10
    MUL BX
    POP BX
    ADD BX,AX
    
    MOV AH,1
    INT 21H
    CMP AL,0DH
    JNE REPEAT2
    
    
    
    MOV AX,BX
    
    OR CX,CX
    JE EXT
    
    NEG AX
    
    EXT:
    
    POP DX
    POP CX
    POP BX
    RET
    
   NOT_DIGIT:
   MOV AH,2
   MOV DL,0DH
   INT 21H
   MOV DL,0AH
   INT 21H
   JMP BEGIN 
   
   
INDEC ENDP
   
   
   OUTDEC PROC
    
    
    
    PUSH AX
    PUSH BX
    PUSH CX
    PUSH DX
    
    OR AX,AX
    JGE END
    
    PUSH AX
    MOV DL,'-'
    MOV AH,2
    INT 21H
    POP AX
    NEG AX
    
    END:
    XOR CX,CX
    MOV BX,10D
    
    REPEAT1:
    XOR DX,DX
    DIV BX
    PUSH DX
    INC CX
    
    OR AX,AX
    JNE REPEAT1
    
    MOV AH,2
    
    PRINT:
    POP DX
    OR DL,30H
    INT 21H
    LOOP PRINT
    
    POP DX 
    POP CX
    POP BX
    POP AX
    RET
    OUTDEC ENDP
   
   
END MAIN