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#include <iostream>
#include <string>
 
using namespace std;
 
struct sinhvien
{
	string tensv;
	string masinhvien;
	float diemtb;
 
};
 
int main(){
 
	sinhvien sv;
	int n;
	cout << "nhap vao so luong sinh vien : ";
	cin >> n;
	fflush(stdin);
	for (int i = 0; i < n; i++){
		cout << "nhap vao thong tin sinh vien thu " << i + 1 << " : " << endl;
		cout << "nhap vao ten sinh vien : ";
		getline(cin, sv.tensv);
		cout << "nhap vao ma sinh vien:  ";
		getline(cin, sv.masinhvien);
		cout << "nhap vao diem : ";
		cin >> sv.diemtb;
		cout << endl << endl << endl;
		fflush(stdin);
 
 
	}
 
	for (int  i = 0; i < n; i++)
	{
		cout << "sinh vien thu " << i + 1 << " : " << endl;
		cout << "ten :" << sv.tensv << endl;
		cout << "ma sinh vien : " << sv.masinhvien << endl;
		cout << "dien trung binh mon : " << sv.diemtb << endl;
		fflush(stdin);
		system("pause");
	}
 
 
}

prog.cpp:20:9: error: use of undeclared identifier 'stdin'
        fflush(stdin);
               ^
prog.cpp:30:10: error: use of undeclared identifier 'stdin'
                fflush(stdin);
                       ^
prog.cpp:41:10: error: use of undeclared identifier 'stdin'
                fflush(stdin);
                       ^
prog.cpp:42:3: error: use of undeclared identifier 'system'
                system("pause");
                ^
4 errors generated.

Standard output is empty