Write a PL/SQL block to show the uses of a variable in explicit cursor query, and no result set is affected despite that value of the variable is incremented after every fetch

DECLARE
    emp_sal   employees.salary%TYPE;
    sal_twise employees.salary%TYPE;
    newvar    INTEGER := 2;
    CURSOR cur1 IS
      SELECT salary,
             salary * newvar
      FROM   employees
      WHERE  job_id LIKE 'PU_%';
BEGIN
    OPEN cur1;
    LOOP
        FETCH cur1 INTO emp_sal, sal_twise;
        EXIT WHEN cur1%NOTFOUND;
        dbms_output.Put_line('When value of the variable: '
                             || newvar);
        dbms_output.Put_line('Salary: '
                             || emp_sal);
        dbms_output.Put_line('Twise of Salary:  '
                             || sal_twise);
        newvar := newvar + 1;
    END LOOP;
    CLOSE cur1;
END;
/