strange thing in sequential file access

Question

Recently, I am trying to write codes to get trained in sequential file access. I learned it well, but the issue is kinda stressing me out. I have a code that work 100%, and its task is "make a code that prints array elements inside a file", the text file name is "numric".

#include <iostream>
#include <fstream>

using namespace std;

int main(){
    int a[3]={5000,6000,7000};
    ofstream outfile("numric.txt");

    if (outfile.is_open()){
        outfile << "employee payroll:" << endl;

        for (int i=0;i<3;i++)
            outfile << a[i] << endl;

        outfile.close();
    } else
        cout << "failed!" << endl;

    return 0;
}

I implemented the code in two different program (VS Code, dev++) and it works fine. It found the file, but when I open the text file, there isn't any text inside it. The code should do its work by finding some text inside it if I opened it.

Note:sometimes when the code works, the antivirus pops a message saying it found an item that doesn't look safe in the program and deletes it.