Studentgrades_managementsystem/system.cpp

#include<iostream>
using namespace std;
#include<string>
#include<vector>
#include<cmath>
#include<algorithm>
#include<fstream>
class Student
{
public:
	Student(int id, string name, int math, int eng,int cl)
	{
		this->id = id;
		this->name = name;
		this->math = math;
		this->eng = eng;
		this->cl = cl;
		this->sum = math + eng + cl;
	}
public:
	int id;
	string name;
	int math,eng,cl;
	int sum;
};   
bool paixu(Student s1, Student s2)
{
	if (s1.sum != s2.sum)
	{
		return s1.sum > s2.sum;
	}
	else
	{
		if (s1.math != s2.math)
		{
			return s1.math > s2.math;
		}
		else
		{
			if (s1.eng != s2.eng)
			{
				return s1.eng > s2.eng;
			}
			else
			{
				if (s1.cl != s2.cl)
				{
					return s1.cl > s2.cl;
				}
				else
				{
					return s1.id > s2.id;
				}
			}
		}
	}
}

class Management
{
public:
	void Add()
	{
		cout << "请依次输入学生的学号，姓名，高数成绩，英语成绩，C语言成绩" << endl;
		int id;
		string name;
		int math;
		int eng;
		int cl;
		cin >> id;
		cin >> name;
		cin >> math;
		cin >> eng;
		cin >> cl;
		Student s(id, name, math, eng, cl);
		v.push_back(s);
		cout << "添加成功" << endl;
		system("pause");
		system("cls");
	}
	vector<Student>v;
	void chaxun()
	{
		cout << "请输入学生的学号" << endl;
		int id;
		cin >> id;
		bool flag = false;
		for (vector<Student>::iterator it = v.begin(); it != v.end(); it++)
		{
			if ((*it).id == id)
			{
				flag = true;
				cout<<"存在该学生！正在查询该学生资料..."<<endl;
				cout << "学号" << "\t" << "姓名" << "\t" << "高数" << "\t" << "英语" << "\t" << "C语言" << endl;
				cout  << (*it).id << "\t"  << (*it).name << "\t"  << (*it).math
					<< "\t"  << (*it).eng << "\t"  << (*it).cl << endl;
			}
		}
		if (flag != true)
			cout << "查无此人！" << endl;
		system("pause");
		system("cls");
	}
	void xiugai()
	{
		cout << "请输入学生的学号" << endl;
		int id;
		cin >> id;
		for (vector<Student>::iterator it = v.begin(); it != v.end(); it++)
		{
			if ((*it).id != id)
			cout<<"查无此人！"<<endl;
			if ((*it).id == id)
			{
				cout << "存在该学生，请重新输入该学生的信息（学号、姓名、高数成绩、英语成绩、C语言成绩）" << endl;
				int id;
				string name;
				int math;
				int eng;
				int cl;
				cin >> id;
				cin >> name;
				cin >> math;
				cin >> eng;
				cin >> cl;
				(*it).id = id;
				(*it).name = name;
				(*it).math = math;
				(*it).eng = eng;
				(*it).cl = cl;
				(*it).sum=math+eng+cl;
				cout << "修改成功！" << endl;
			}
		}
		system("pause");
		system("cls");
	}
	void Sort()
	{
		sort(v.begin(), v.end(), paixu);
		cout << "学号" << "\t" << "姓名" << "\t" << "高数" << "\t" << "英语" << "\t" << "C语言\t" << "总分" << endl;
		for (vector<Student>::iterator it = v.begin(); it != v.end(); it++)
		{
			cout << (*it).id << "\t" << (*it).name << "\t" << (*it).math << "\t" << (*it).eng << "\t" << (*it).cl << "\t" << (*it).sum << endl;
		}
		system("pause");
		system("cls");
	}

	void Show() 
	{
			cout << "学号" << "\t" << "姓名" << "\t" << "高数" << "\t" << "英语" << "\t" << "C语言" << "\t"<<"总分" << endl;
			for (vector<Student>::iterator it = v.begin(); it != v.end(); it++)
			cout << (*it).id << "\t" << (*it).name << "\t" << (*it).math << "\t" << (*it).eng << "\t" << (*it).cl << "\t" << (*it).sum << endl;	
	}
};
void Menu()
{
	int i;
	cout<<"                  桂林理工大学博文管理学院学生成绩管理系统"<<endl;
    for (i = 0; i < 80; i++)
        cout<<"*";
        cout<<endl;
    cout << "*                                                                              *" << endl;
	cout << "*                           1.添加学生信息" << "\t" <<  "2.按学号查询学生信息           *" << endl;
	cout << "*                           3.修改学生信息" << "\t" <<  "4.按降序排序学生成绩           *" << endl;
	cout << "*                           5.显示所有学生信息" << "\t" <<  "0.退出                         *" << endl;
	cout << "*                                                                              *" << endl;
	for (i = 0; i < 80; i++)
        cout<<"*";
}

int main()
{
	Management m;
	int select;
	while (1)
	{
		Menu();
		cin >> select;
		switch (select)
		{
		case 1:
			m.Add();
			break;
		case 2:
			m.chaxun();
			break;
		case 3:
			m.xiugai();
			break;
		case 4:
			m.Sort();
			break;
		case 5:
			m.Show();
			break;
		case 0:
			exit(0);
		default:
			break;
		}
	}
	return 0;
}