Question

要求使用C++建立一个学生信息管理系统，具有创建、显示、查找、删除、插入功能。

信息包括学号、姓名及性别（使用顺序表），还有每位学生选修课程及成绩（使用单链表，每个结点的数据域包括课程名与成绩，每位学生课程不完全相同），并计算平均分、排序。该如何实现？

Answer 1

#include <iostream>

struct subject {
	double			subject_score;
	std::string		subject_name;
};

class student {
	std::string		name;
	subject*		subject_info;
	unsigned int	subject_num;
	
	public:
		student() {
			name			= "unknown";
			subject_num		= 0;
			subject_info	= nullptr;
		}
		
		student( std::string name, unsigned int subject_number ): name(name), subject_num(subject_number) {
			subject_info = new subject [subject_num];
			for ( unsigned int i=0; i<subject_num; ++i ) {
				std::cout	<< "Name of subject [" << i+1 << "] : ? ";
				std::cin	>> subject_info[i].subject_name;
				std::cout	<< "Score of " << subject_info[i].subject_name << " -> ";
				std::cin	>> subject_info[i].subject_score;
			}
		}
		
		~student() {
			delete [] subject_info;
		}
		
		void set_info() {
			std::cout << "student\'s name : ? "; 		std::cin >> name;
			std::cout << "number of subjects : ? ";	std::cin >> subject_num;
			subject_info = new subject [subject_num];
			for ( unsigned int i=0; i<subject_num; ++i ) {
				std::cout	<< "Name of subject [" << i+1 << "] : ? ";
				std::cin	>> subject_info[i].subject_name;
				std::cout	<< "Score of " << subject_info[i].subject_name << " -> ";
				std::cin	>> subject_info[i].subject_score;
			}
		}
		
		friend std::ostream& operator<< ( std::ostream& out, const student& one ) {
			out << one.name << "\'s score information\n";
			for ( unsigned int i=0; i<one.subject_num; ++i ) {
				out	<< one.subject_info[i].subject_name << "\t-- ";
				out	<< one.subject_info[i].subject_score << '\n';
			}
			return out;
		}
		
		friend double average_score( const student& one );
};

double average_score( const student& one ) {
	double average;
	for ( unsigned int i=0; i<one.subject_num; ++i ) {
		 average += one.subject_info[i].subject_score ;
	}
	return average/(double)one.subject_num;
}

int main(int argc, char *argv[]) {
	unsigned int num = 0;
	std::cout << "how many students in classroom_A1 ? ";	std::cin >> num;
	student* classroom_A1 = new student [num];
	
	for ( unsigned int i=0; i<num; ++i ) {
		classroom_A1[i].set_info();
	}
	
	for ( unsigned int i=0; i<num; ++i ) {
		std::cout << classroom_A1[i] << std::endl;
		std::cout << "average_score:\t" << average_score( classroom_A1[i] ) << std::endl;
	}
	
	delete [] classroom_A1;
}

排序没有，可以在这个语言结构中自行插上。

排版有点乱，你自己调整一下吧！