定义一个学生类，其中有3个数据成员有学号、姓名、年龄，以及若干成员函数。同时编写主函数使用这个类，实现对学生数据的赋值和输出。

使用成员函数实现输入、输出；

使用构造函数和析构函数实现对数据的输入、输出；

编写主函数，定义对象，完成相应功能。

-Define a category of students, of which there are three places its data members, name, age, and a number of member functions. At the same time, the preparation of the main function of the use of this type to achieve the assignment of students and output data. Requirements: (1) member functions input, output　(2) the use of constructor and destructor function of data input and output　(3) the preparation of the main function, the definition of the object, the completion of the corresponding function.