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#include <iostream>
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#include <string>
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using std::string, std::cout, std::cin, std::endl;
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class Student
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{
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protected:
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string name;
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int age;
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public:
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Student(string _name, int _age) : name{_name}, age{_age} {}
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int schooling()
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{
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return 0; // 空泛的学生类，缺乏收费依据，直接返回0
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}
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};
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class MiddleStudent : public Student
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{
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int books;
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public:
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MiddleStudent(string _name, int _age, int _books)
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: Student(_name, _age), books{_books} {}
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int schooling()
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{
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return books * 20; // 中学生按20元单价收书本费
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}
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};
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class CollegeStudent : public Student
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{
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int credit;
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public:
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CollegeStudent(string _name, int _age, int _credit)
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: Student(_name, _age), credit{_credit} {}
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int schooling()
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{
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return credit * 120; // 大学生按120单价收学分费
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}
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};
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class GraduateStudent : public Student
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{
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int credit;
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public:
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GraduateStudent(string _name, int _age, int _credit)
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: Student(_name, _age), credit{_credit} {}
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int schooling()
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{
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return credit * 200; // 研究生按200单价收学分费
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}
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};
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int get_total(Student s[], int len)
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{
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int total{};
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for (int i{0}; i < len; ++i)
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total += s[i].schooling();
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return total;
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}
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int main()
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{
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MiddleStudent ms{"张三", 15, 20};
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CollegeStudent cs{"张二", 18, 150};
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GraduateStudent gs{"张大", 22, 40};
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Student s[]{ms, cs, gs};
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std::cout << get_total(s, 3) << '\n';
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// 本程序失败了，输出为0，为什么？
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} |
