创建一个飞机类，其中数据成员包括长、宽、高、最大载重和最大载重下的航程。当飞机的载重不超过最大载重时，重量每减轻1000千克，航程就会提高100千米。在主类中创建该类的对象，当已知飞机的载重时，求飞机的航程-Create an aircraft category, which comprises the data length, width, height, maximum load and maximum load under the voyage. When the plane' s load does not exceed the maximum load, the weight of 1000 kg per ease, will enhance the range of 100 kilometers. In the main class to create objects of this class, when a known load the aircraft, find the plane' s flight