thisinh

#include "stdafx.h"
#include <iostream>
#include<string>
#include<windows.h>
using namespace std;
class thisinh
{
private:
    char sbd[25];
    float toan, ly, hoa;
public:

    void nhap()
    {
        fflush(stdin);
        cout << "\n------------------------------------------------------------\n";

        cout << "Nhap so bao danh :    ";
        cin >> sbd;
        do{
            cout << "Nhap diem toan :    ";
            cin >> toan;
            if (toan<0 || toan>10){

                cout << "\nNhap lai 0 < diem toan <10" << endl;
                system("cls");
            }
        } while (toan<0 || toan>10);

        do{
            cout << "Nhap diem ly :    ";
            cin >> ly;
            if (ly<0 || ly>10){
                cout << "\nNhap lai 0 < diem ly <10" << endl;
                system("cls");
            }

        } while (ly<0 || ly>10);
        do{
            cout << "Nhap diem hoa :    ";
            cin >> hoa;
            if (hoa<0 || hoa>10){

                cout << "\nNhap lai 0 < diem hoa <10" << endl;
                system("cls");
            }
        } while (hoa<0 || hoa>10);
    }
    void in()
    {
        cout << "SBD: " << sbd;
        cout << "\tDiem toan:" << toan << "\tDiem ly:" << ly << "\tDiem hoa:" << hoa;
        cout << "\tTong diem: " << tongdiem() << endl;
    }


    float tongdiem()
    {
        return(toan + ly + hoa);
    }
};

class ds
{
private:
    int n;
    thisinh ts[100];

public:


    void nhapds()
    {
        cout << "Nhap vao so luong thi sinh:  ";
        cin >> n;
        for (int i = 0; i < n; i++)
            ts[i].nhap();
    }


    void inds()
    {
        for (int i = 0; i < n; i++)
            ts[i].in();
    }
    void sapxep()
    {

        for (int i = 0; i < n - 1; i++)
        for (int j = i + 1; j<n; j++)
        if (ts[i].tongdiem()>ts[j].tongdiem())
        {
            thisinh tg;
            tg = ts[i];
            ts[i] = ts[j];
            ts[j] = tg;
        }
    }

    void tongdiemtren18()
    {

        for (int i = 0; i<n; i++)
        if (ts[i].tongdiem()>18)
            ts[i].in();
    }

};
int main()
{
    ds ds1;
    ds1.nhapds();
    system("cls");
    cout << "\nDanh sach cac thi sinh sap xep theo thu tu tang dan ve tong diem:\n" << endl;
    ds1.sapxep();
    ds1.inds();
    cout << "--------------------------------------------------------------------------\n";
    cout << "\nDanh sach cac thi sinh co tong diem tren 18 la: \n" << endl;
    ds1.tongdiemtren18();

    return 0;
}