Fix ho

#include<iostream>
#include<cmath>
using namespace std;
class SinhVien{
private:
    string MaSV, HoTen,Lop,NgaySinh;
    float GPA;
public:
    SinhVien();
    friend void nhap(SinhVien &a);
    friend void in(SinhVien &a);
};
SinhVien::SinhVien(){
    MaSV = HoTen = Lop = NgaySinh = "";
    GPA = 0;
}
void nhap(SinhVien &a){
    a.MaSV = "B20DCCN001";
    cin.ignore();
    getline(cin, a.HoTen);
    cin >> a.Lop;
    cin >> a.NgaySinh;
    cin >> a.GPA;
}
void in(SinhVien &a){
    cout << a.MaSV << " " <<  a.Lop << " " << a.HoTen << " " << a.NgaySinh << " " << a.GPA << endl;
}
int main(){
    SinhVien a();
    nhap(a);
    in(a);
    return 0;
}