C++ send numbers from a file to odd.txt and even.txt

#include <iostream>
#include <fstream>


using namespace std;


int main() {
    int i;
    ifstream f("numere.txt");
    ofstream g("impare.txt");
    ofstream g2("pare.txt");
    int numar;

    while (f>>numar) {
        if (numar%2==1) {
            g << numar << " ";
        } else {
            g2 << numar << " ";
        }
    }
    f.close();
    g.close();
    g2.close();

    system("pause");
}