1．定义一个学生类Student，学生类中有3个私有数据成员：name(姓名)、cls(班级)、grade(年级)；3个公有成员函数；Student(构造函数)、display、~Student(析构函数)。使用构造函数为Student类的对象赋值(name使用动态内存分配空间)，display负责显示学生的基本信息，在析构函数中释放动态分配的内存-1. Definition of a student class Student, student class has three private data members: name (name), cls (class), grade (grade)　three public member function　Student (constructor), display, ~ Student (destructor function). Use the constructor for the object of Student class assignments (name space using dynamic memory allocation), display the basic information that the student is responsible for the destructor to release dynamically allocated memory