#include <iostream>
#include <string>
#include <string.h>
#include <stdlib.h>
using namespace std;
struct Sinhvien                                                 //tạo 1 truong thuoc tinh sinh vien
{
	string masv;
	string tensv;
	string lop;
	double diem;
};
void Themsinhvien();                                            //khai bao ham
Sinhvien arrSv[50];                                             // khai bao mang sinh vien voi toi da 50 sinh vien de luu tru .
int ind = 0;//chi so mang de xem so luong sinh vien da them
void Lietketatcasinhvien();
void Timkiemsinhvien(string masv);
void Xoasinhvien(string masv);
void Lietkesinhvientheolop(string lop);
void Chinhsuathongtin();
bool kiemtra(string masv, int vitri);                            //kiem tra su tom tai sinh vien trong mang
int main()
{
	int luachon;
	while (true)
	{
		do
		{
			cout<< " Chuong trinh quan li sinh vien"<<endl;
			cout<< " 1. Them sinh vien"<<endl;
			cout<< " 2. Tim kiem sinh vien"<<endl;
			cout<< " 3. Chinh sua thong tin sinh vien "<<endl;
			cout<< " 4. Xoa sinh vien "<<endl;
			cout<< " 5.Liet ke danh sach sinh vien theo lop"<<endl;
			cout<< " 6.Liet ke danh sach tat ca sinh vien "<<endl;
			cout<< " 7. Thoat "<<endl;
			cout<< " Lua chon: ";
			cin>>luachon;
			system("clear");
		}
		while (luachon < 1 || luachon>7);
		switch(luachon)
		{
			case 1:
			{
				Themsinhvien();
				cout<<"Back";
				system("PAUSE>NULL");
				break;
			}
			case 2:
			{	string msv;
				cout<<"Nhap ma: ";
				getline(cin,msv);
				cin.ignore();
				Timkiemsinhvien(msv);
				cout<<"Back";
				system("PAUSE>NULL");
				break;
			}
			case 3:
			{	string msv;
				cout<<" Chinh sua thong tin sinh vien "<<endl;
				cin.ignore();
				cout<<"Nhap ma sinh vien";
				getline(cin, msv);

				Chinhsuathongtin();
				cout<<"Back";
				system("PAUSE>NULL");
				break;
			}
			case 4:
			{	string masv;
				cout<<" Xoa sinh vien "<<endl;
				cin.ignore();
				cout<<"Nhap ma sinh vien";
				getline(cin,masv);
				Xoasinhvien(masv);
				cout<<"Back";
				system("PAUSE>NULL");
				break;
			}
			case 5:
			{	string lop;
				cin.ignore();
				cout<<"Nhap lop: ";
				getline(cin,lop);
				Lietkesinhvientheolop( lop);
				cout<<"Back";
				system("PAUSE>NULL");
				break;
			}
			case 6:
			{	Lietketatcasinhvien();
				cout<<"Back";
				system("PAUSE>NULL");
				break;
			}
			case 7:
				exit(1);
			}
	}
	return 0;
}
void Themsinhvien ()
{ // tạo đối tượng cho lớp sinh viên


		int n;
		cout<<"Nhap so sinh vien can them:"<<endl;
		cin>>n;
		for (int i=0;i<n;i++)
			{
				Sinhvien tmpsv;// sinh vien gan cho bien temp
				cin.ignore();
				cout<<"Nhap ma sinh vien: ";
				getline(cin, tmpsv.masv);
				cout<<"Nhap ten sinh vien: ";
				getline(cin, tmpsv.tensv);
				cout<<"Nhap lop: ";
				getline(cin, tmpsv.lop);
				cout<<"Nhap diem: ";
				cin>>tmpsv.diem;
				arrSv[ind] = tmpsv;
				ind++;
			}

}
void  Lietketatcasinhvien()
{
	cout<<"Danh sach tat ca cac sinh vien"<<endl;
	cout<<"Ma sinh vien"<<"        "<<"Ten sinh vien"
			<<"      "<<"Lop"<<"       "<<"Diem"<<endl;
		for (int i =0; i <ind;i++)
			cout<<arrSv[i].masv<<"         "<<arrSv[i].tensv<<"        "
			<<arrSv[i].lop<<"         "<<arrSv[i].diem<<endl;
}
void Timkiemsinhvien(string masv)
{
	for (int i=0; i < ind; i++)
	{
		if (masv == arrSv[i].masv)
		{
			cout<<"Ten sinh vien: "<<arrSv[i].tensv<<endl;
			cout<<"Lop: "<<arrSv[i].lop<<endl;
			cout<<"Diem: "<<arrSv[i].diem<<endl;
			return ;
		}
	}
	cout<<"khong co ma sinh vien nay";
}
void Xoasinhvien(string masv)
{
	for (int i =0; i<ind; i++)
	{
		if (masv == arrSv[i].masv)
		{
			for (int j=0; j< ind -1; j++)
				arrSv[j] = arrSv[j+1];
				ind --;                                           // sau khi xoa phantu thì giam tong di 1 sinh vien
				cout<<"Da xoa"<<endl;
				return;
		}
	}
	cout<<"khong tim thay sinh vien"<<endl;
}
void Lietkesinhvientheolop(string lop)
{
	int count = 0;
	for (int i =0; i<ind; i++)
	{
		if (lop == arrSv[i].lop)
		{
			cout<<arrSv[i].masv<<arrSv[i].tensv<<arrSv[i].lop<<arrSv[i].diem<<endl;
		}
	}
	if(count==0 )
		cout<<"Sinh vien khong thuoc lop nay"<<endl;
}
void Chinhsuathongtin(){};
bool kiemtra(string masv, int vitri)
{
	bool check = false;
	for (int i=0;i< ind;i++)
	{
		if(masv == arrSv[i].masv)
		{
			vitri=i;
			check = true;
			break;
		}
		break ;
	}
}