Phần tử lẻ cuối

//https://www.facebook.com/CungHocLapTrinhUIT/?ref=bookmarks
#include <iostream>
using namespace std;
void Nhap(float a[], int &n)
{
    cout << "Nhap so phan tu n: ";
    cin >> n;
    cout << "Nhap mang: " << endl;
    for (int i = 0; i < n; i++)
    {
        cout << "Nhap phan tu thu " << i + 1 << " : ";
        cin >> a[i];
    }
}
int CuoiCung(float a[], int n)
{
    for (int i = n - 1; i > 0; i--)
    {
        if (a[i] < 0 && a[i] >= -1.0f)
            return i;
    }
    return -1;
}
int main()
{
    float a[100];
    int n;
    Nhap(a, n);
    int ret = CuoiCung(a, n);
    if (ret == -1)
        cout << "Khong co phan tu le\n" << endl;
    else
        cout << "vi tri so le cuoi cung: " << ret << endl;
    return 0;
}