c写一个学生信息管理系统，不喜勿喷

#include
#include
#include
#include
using namespace std;
#define N 2
#define MAX 200
class Show
{
public:
	 Show()
	{
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "                         管理端： " << endl;
		cout << endl;
		cout << endl;
		cout << "*★☆★            " << "1.增加学生信息" << "            ★☆★*" << endl;
		cout << "*★☆★            " << "2.删除学生信息" << "            ★☆★*" << endl;
		cout << "*★☆★            " << "3.修改学生信息" << "            ★☆★*" << endl;
		cout << "*★☆★            " << "4.查找学生信息" << "            ★☆★*" << endl;
		cout << "*★☆★            " << "5.显示学生信息" << "            ★☆★*" << endl;
		cout << "*★☆★            " << "其他任意键退出" << "            ★☆★*" << endl;
		cout << endl;
		cout << endl;
		cout << "请选择序号" << endl;
		cout << "---------欢迎联系2460918833--------潇---------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
	}
};
class Nstudent
{
public:
	string Sno;
	string Sname;
	string Sex;
	string Sclass;
	int Sage;
	string Splace;
	double Score[2] = { 0,0 };
	double Sum_Sc = 0;
	string inf[9] = { "学号:","姓名:","性别:","班级:","年龄:","户籍:","语文成绩:","数学成绩:","总分:" };
};
Nstudent student[MAX];
void studentinf(int quantity);
int quantity;//学生数目
class InData//写入内存
{
public:
	InData()//写入内存
	{
		ifstream File_cin("C:\\Users\\潇\\Desktop\\Student.txt");
		File_cin >> quantity;
		for (int i = 0; i < quantity; i++)
		{
			File_cin >> student[i].Sno;
			File_cin >> student[i].Sname;
			File_cin >> student[i].Sex >> student[i].Sclass >> student[i].Sage >> student[i].Splace;
			for (int j = 0; j < N; j++)
			{
				File_cin >> student[i].Score[j];
				student[i].Sum_Sc += student[i].Score[j];
			}
		}
		File_cin.close();
	}
};
class OutData
{
public:
	OutData()
	{
		fstream File_cout("C:\\Users\\潇\\Desktop\\Student.txt");
		File_cout << quantity << endl;
		for (int i = 0; i < quantity; i++)
		{
			File_cout << student[i].Sno << " ";
			File_cout << student[i].Sname << " ";
			File_cout << student[i].Sex << " ";
			File_cout << student[i].Sclass << " ";
			File_cout << student[i].Sage << " ";
			File_cout << student[i].Splace << " ";
			for (int j = 0; j < N; j++)
			{
				File_cout << student[i].Score[j] << " ";
			}
			File_cout << student[i].Sum_Sc;
			File_cout << endl;
		}
		File_cout.close();
	}
};
void Show_inf();
void CetData()
	{
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "               学生信息管理系统" << endl;
		cout << "        增加学生信息:" << endl;
		cout << "     请按提示输入" << endl;
		cout << "     请输入增加数量: " << endl;
		int nn;
		cin >> nn;
		for (int i = 0; i < nn; i++, quantity++)
		{
			system("cls");
			cout << "----------------------------------------------------" << endl;
			cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
			cout << "               学生信息管理系统" << endl;
			cout << "        增加学生信息:" << endl;
			cout << "请按提示输入第" << i + 1 << "个学生信息" << endl;
			cout << "*★☆★    " << student[quantity].inf[0];
			cin >> student[quantity].Sno;
			cout << endl;
			cout << "*★☆★    " << student[quantity].inf[1] << "： ";
			cin >> student[quantity].Sname;
			cout << endl;
			cout << "*★☆★    " << student[quantity].inf[2] << "： ";
			cin >> student[quantity].Sex;
			cout << endl;
			cout << "*★☆★    " << student[quantity].inf[3] << "： ";
			cin >> student[quantity].Sclass;
			cout << endl;
			cout << "*★☆★    " << student[quantity].inf[4] << "：";
			cin >> student[quantity].Sage;
			cout << endl;
			cout << "*★☆★    " << student[quantity].inf[5] << "：";
			cin >> student[quantity].Splace;
			cout << endl;
			for (int j = 0; j < N; j++)
			{

				cout << "*★☆★    " << student[quantity].inf[6 + j] << "： ";
				cin >> student[quantity].Score[j];
				student[quantity].Sum_Sc += student[quantity].Score[j];
				cout << endl;
			}
			cout << "第" << i + 1 << "个学生信息输入完成" << endl;

			cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
			cout << "----------------------------------------------------" << endl;
			Sleep(1500);
			system("cls");

		}
};
void Judje();
void Clien();
void DelData();
void LooData();
void ChaData();

//写入文件
int main()
{
	ifstream Cin_file("C:\\Users\\潇\\Desktop\\root.txt");
	string File_name;
	string File_passname;
	Cin_file >> File_name;
	Cin_file >> File_passname;
	Cin_file.close();
	cout << "----------------------------------------------------" << endl;
	cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
	cout << "               学生信息管理系统" << endl;
	cout << endl;
	cout << endl;
	cout << "*★☆★    " << "请输入账号：";
	string name;
	cin >> name;
	if (name[0] != '1')
	{
		InData nData;
		for (int i = 0; i < quantity; i++)
		{
			if (name == student[i].Sno)
			{
				studentinf(i);
				exit(0);
			}
		}
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "                   学生端： " << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "                " << "学生信息不存在" << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "----------------------------------------------------" << endl;
		system("pause");
		exit(0);
	}
	else
		if (name == File_name);
		else
		{
			cout << "*★☆★    " << "账号不存在" << endl;
			cout << "结束" << endl;
			Sleep(3000);
			exit(0);
		}
	for (int i = 0; i < 15; i++) cout << ' '; cout << endl;
	cout << "*★☆★    " << "请输入密码：";
	string password;
	cin >> password;
	if (password == File_passname) Clien();
	else
	{
		cout << "*★☆★    " << "密码错误" << endl;
		cout << "*★☆★    " << "请输入密码：";
		int count = 1;
		while (count < 3)
		{
			cin >> password;
			if (password == "exit")
			{
				cout << "程序即将退出";
				Sleep(5000);
				exit(0);
			}
			if (password == File_passname)
			{
				Clien();
			}

		}
		cout << "*★☆★    " << "密码错误次数过3，结束" << endl;
		cout << endl;
		cout << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "----------------------------------------------------" << endl;
		Sleep(3000);
		exit(0);
	}	
}


void Clien()
{
	system("cls");
	Show show;
	getchar();
	//程序入口  
	InData();
	int a;
	cin >> a;
	switch (a)
	{
	case 1:
		system("cls");
		CetData() ;
		Judje();
	case 2:
		system("cls");
		DelData();
		Judje();
	case 3:
		system("cls");
		ChaData();
		Judje();
	case 4:
		system("cls");
		LooData();
		getchar();
		Judje();
	case 5:
		system("cls");
		Show_inf();
		getchar();
		getchar();
		Judje();
	default:
		OutData outData;
		
		exit(0);

		break;
	}
}

void ChaData()
{
	cout << "----------------------------------------------------" << endl;
	cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
	cout << "               学生信息管理系统" << endl;
	cout << "       查找学生信息:" << endl;
	cout << "     请按提示输入" << endl;
	cout << "     请选择: " << endl;
	cout << endl;
	cout << endl;
	cout << "*★☆★            " << "1.按学号" << "            ★☆★*" << endl;
	cout << "*★☆★            " << "2.按姓名" << "            ★☆★*" << endl;
	cout << endl;
	cout << endl;
	cout << "请选择序号" << endl;
	cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
	cout << "----------------------------------------------------" << endl;
	getchar();
	char a = getchar();
	if (a == '1')
	{
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "               学生信息管理系统" << endl;
		cout << "       查找学生信息:" << endl;
		cout << "    您选择了按学号查找: " << endl;
		cout << "     请输入学号" << endl;
		string name;
		cin >> name;
		for (int i = 0; i < quantity; i++)
		{
			if (name == student[i].Sno)
			{
				cout << "请按提示输入第" << i + 1 << "个学生信息" << endl;
				cout << "*★☆★    " << student[i].inf[0];
				cin >> student[i].Sno;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[1] << ": ";
				cin >> student[i].Sname;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[2] << ": ";
				cin >> student[i].Sex;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[3] << ": ";
				cin >> student[i].Sclass;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[4] << ": ";
				cin >> student[i].Sage;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[5] << ": ";
				cin >> student[i].Splace;
				for (int j = 0; j < N; j++)
				{

					cout << "*★☆★    " << student[i].inf[6 + j] << ": ";
					cin >> student[i].Score[j];
					cout << endl;
				}

				cout << "*★☆★    " << student[i].inf[8] << ": ";
				cin >> student[i].Sum_Sc;
				cout << endl;
			}
		}
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "                   学生信息管理系统 " << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "                " << "学生信息不存在" << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "----------------------------------------------------" << endl;
		getchar();
		getchar();
		return;
	}
	else
	{
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "               学生信息管理系统" << endl;
		cout << "       查找学生信息:" << endl;
		cout << "    您选择了按姓名查找: " << endl;
		cout << "     请输入姓名" << endl;
		string name;
		cin >> name;
		for (int i = 0; i < quantity; i++)
		{
			if (name == student[i].Sname)
			{
				cout << "请按提示输入" << endl;
				cout << "*★☆★    " << student[i].inf[0];
				cin >> student[i].Sno;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[1] << ": ";
				cin >> student[i].Sname;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[2] << ": ";
				cin >> student[i].Sex;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[3] << ": ";
				cin >> student[i].Sclass;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[4] << ": ";
				cin >> student[i].Sage;
				cout << endl;
				cout << "*★☆★    " << student[i].inf[5] << ": ";
				cin >> student[i].Splace;
				for (int j = 0; j < N; j++)
				{

					cout << "*★☆★    " << student[i].inf[6 + j] << ": ";
					cin >> student[i].Score[j];
					cout << endl;
				}

				cout << "*★☆★    " << student[i].inf[8] << ": ";
				cin >> student[i].Sum_Sc;
				cout << endl;
			}
		}
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "                   学生信息管理系统 " << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "                " << "学生信息不存在" << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "----------------------------------------------------" << endl;
		getchar();
		getchar();
		return;
	}

}
void DelData()
{
	cout << "----------------------------------------------------" << endl;
	cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
	cout << "               学生信息管理系统" << endl;
	cout << "       删除学生信息:" << endl;
	cout << "     请按提示输入" << endl;
	cout << "     请选择: " << endl;
	cout << endl;
	cout << endl;
	cout << "*★☆★            " << "1.按学号" << "            ★☆★*" << endl;
	cout << "*★☆★            " << "2.按姓名" << "            ★☆★*" << endl;
	cout << endl;
	cout << endl;
	cout << "请选择序号" << endl;
	cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
	cout << "----------------------------------------------------" << endl;
	getchar();
	char a = getchar();
	if (a == '1')
	{
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "               学生信息管理系统" << endl;
		cout << "       删除学生信息:" << endl;
		cout << "    您选择了按学号查找: " << endl;
		cout << "     请输入学号" << endl;
		string name;
		cin >> name;
		for (int i = 0; i < quantity; i++)
		{
			if (name == student[i].Sno)
			{
				for (int j = i; j < quantity - 1; j++)
				{
					student[i] = student[j];
				}
				quantity--;
				getchar();
				return;
			}
		}
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "                   学生信息管理系统 " << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "                " << "学生信息不存在" << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "----------------------------------------------------" << endl;
		getchar();
		getchar();
		return;
	}
	else
	{
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "               学生信息管理系统" << endl;
		cout << "       查找学生信息:" << endl;
		cout << "    您选择了按姓名查找: " << endl;
		cout << "     请输入姓名" << endl;
		string name;
		cin >> name;
		for (int i = 0; i < quantity; i++)
		{
			if (name == student[i].Sno)
			{
				for (int j = i; j < quantity - 1; j++)
				{
					student[i] = student[j];
				}
				quantity--;
				getchar();
				return;
			}
		}
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "                   学生信息管理系统 " << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "                " << "学生信息不存在" << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "----------------------------------------------------" << endl;
		getchar();
		getchar();
		return;
	}

}
void studentinf(int quantity)
{
	system("cls");
	cout << "----------------------------------------------------" << endl;
	cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
	cout << "                学生信息管理系统 " << endl;
	cout << "       信息： " << endl;
	cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
	for (int i = 0; i < 15; i++)
		cout << ' ';
	cout << "*★☆★    " << student[quantity].inf[0] << student[quantity].Sno << endl;
	for (int i = 0; i < 15; i++)
		cout << ' ';
	cout << "*★☆★    " << student[quantity].inf[1] << student[quantity].Sname<> name;
		for (int i = 0; i < quantity; i++)
		{
			if (name == student[i].Sno)
			{
				studentinf(i);
			}
		}
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "                   学生信息管理系统 " << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "                " << "学生信息不存在" << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "----------------------------------------------------" << endl;
		getchar();
		getchar();
		return;
	}
	else
	{
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "               学生信息管理系统" << endl;
		cout << "       查找学生信息:" << endl;
		cout << "    您选择了按姓名查找: " << endl;
		cout << "     请输入姓名" << endl;
		string name;
		cin >> name;
		for (int i = 0; i < quantity; i++)
		{
			if (name == student[i].Sname)
				studentinf(i);
		}
		system("cls");
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "                   学生信息管理系统 " << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "                " << "学生信息不存在" << endl;
		for (int i = 0; i < 4; i++)cout << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << "----------------------------------------------------" << endl;
		getchar();
		getchar();
		return;
	}
	cout << "----------------------------------------------------"<< endl;
	cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*"<< endl;
	cout << "               学生信息管理系统"<< endl;
	for (int i = 0; i < quantity; i++)
	{
		cout<< student[i].Sno<<" "<< student[i].Sname<<" "<< student[i].Sex <<" "<< student[i].Sclass <<" "<< student[i].Sage <<" "<< student[i].Splace;
		for (int j = 0; j < N; j++)
		{
			cout<< student[i].Score[j]<<" ";
		}
		cout << endl;
	}

}
void Judje()
{
	system("cls");
	cout << "----------------------------------------------------" << endl;
	cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
	cout << "                   管理端： " << endl;
	cout << endl;
	cout << endl;
	cout << "*★☆★    " << "是否继续操作 y or n" << endl;
	char flag;
	cout << "*★☆★    ";
	cin >> flag;
	if (flag == 'y' || flag == 'Y')
		Clien();
	else
	{
		cout << "*★☆★    " << "程序将自动退出" << endl;
		cout << endl;
		cout << endl;
		cout << endl;
		cout << "----------------------------------------------------" << endl;
		cout << "*★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★*" << endl;
		cout << endl;
		OutData();
		Sleep(3000);
		exit(0);
	}
}
void Show_inf()
{
	cout <<"学生数目："<< quantity << endl;
	for (int i = 0; i < quantity; i++)
	{
		cout << student[i].Sno << " ";
		cout << student[i].Sname << '  ';
		cout << student[i].Sex << " ";
		cout << student[i].Sclass << " ";
		cout << student[i].Sage << " ";
		cout << student[i].Splace << " ";
		for (int j = 0; j < N; j++)
		{
			cout << student[i].Score[j] << " ";
		}
		cout << student[i].Sum_Sc;
		cout << endl;
	}
}