问c++ 循环中指针和堆区对象为什么可以重复定义？

while (ifs >> id && ifs >> name && ifs >> dId)   
	{
		Worker* worker = NULL;   //问题1

		if (dId == 1)
		{
			worker = new Employee(id, name, dId);    //问题2
		}
		else if (dId == 2)
		{
			worker = new Manger(id, name, dId);
		}
		else 
		{
			worker = new Boss(id, name, dId);
		}

		this->m_EmpArray[index] = worker;
		index++;
	}