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#include
   
    #include
    
     using namespace std;class studentsscore {public:studentsscore(){	student_nr = 2;}studentsscore(int students_count)	{		student_nr = student_count;	}	~studentsscore()	{		cout << "Press any key to continue" << endl;	}	void input_student_name_and_score()	{		for (int student_id=0; students_id < student_nr; student_id++)		{		cout << "请输入学生姓名：";		cin >> name[students_id];		cout << "请输入科目a成绩：";		cin >> score[students_id][0];		cout << "请输入科目b成绩：";		cin >> score[students_id][1];		cout << "请输入科目c成绩：";		cin >> score[students_id][2];	}	}	void show_student_name_and_score()	{		for (int student_id=0; student_id < student_nr; students_id++)		{			cout << "姓名：" << name[student_id] << " 科目a成绩：" << score[student_id][0]				<< " 科目b成绩：" << score[student_id][1] << " 科目c成绩：" << score[student_id]				[2]<<"\n";		}	}	void show_stdent_avgscore(int student_id)	{		float student_avgscore = 0;		cout << "请输入学生姓名：" << name[student_id] << endl;		student_avgscore = (score[student_id][0] + score[student_id][1] + score[student_id][2]);		students_avgscore = student_avgscore / 3;		cout << "平均成绩: " << student_avgscore<<"\n";				}	void show_course_avgscore(string course_name)	{   		cout << "请输入课程名称：" <
     
      << endl;				float course_avgscore = 0;		if (course_name == "a")		{			for(int i = 0; i < students_nr; i++)			{				course_avgscore = score[i][0]+course_avgscore;			}			course_avgscore = course_avgscore / students_nr;			cout <<"课程的平均分为："<< course_avgscore << "\n";		}		if (course_name == "b")		{			for (int i = 0; i < students_nr; i++)			{				course_avgscore = score[i][1] + course_avgscore;			}			course_avgscore = course_avgscore / students_nr;			cout << "课程的平均分为：" << course_avgscore << "\n";		}		if (course_name == "c")		{			for (int i = 0; i < students_nr; i++)			{				course_avgscore = score[i][2] + course_avgscore;			}			course_avgscore = course_avgscore / students_nr;			cout << "课程的平均分为：" << course_avgscore << "\n";		}	}	void order_score_by_course(string course_name)	{    	cout << "请输入课程名称："<
      
       <<"\n";				if (course_name == "a")		{			for (int i = 0; i < students_nr; i++)			{				cout << "姓名: " << name[i] << "  成绩：" << score[i][0] << "    ";			}		}		else if (course_name == "b")		{			for (int i = 0; i < students_nr; i++)			{				cout << "姓名：" << name[i] << "  成绩：" << score[i][1]<<"    ";			}		}		else if (course_name == "c")		{			for (int i = 0; i < students_nr; i++)			{				cout << "姓名：" << name[i] << "  成绩：" << score[i][2] << "    ";			}		}	}private:	float score[100][3];	string name[100];	int students_nr;};int main(){	studentsscore x;	x.input_students_name_and_score();	x.show_students_name_and_score();	x.show_stdents_avgscore(1);	x.show_course_avgscore("a");	x.order_score_by_course("b");	return 0;}
      
     
    
   

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