Is "C:\nul" directed to any file or folder?

Question

I used this code to create a filestream ,and I tried to output something by this filestream.

Here's my cpp code : (MinGW 9.2.1,Windows 10)

ofstream outfile;
outfile.open("C:\\nul");
for(unsigned long long i=1llu;i<=18446744073709551615ull;++i)
    outfile<<i<<endl;

It ran for a few seconds and I use "Ctrl+C" to kill the progress, but it seem to be the available capacity of my C disk is smaller at runtime. My description may not be accurate enough because of my poor English :(

Let me put it another way: I noticed that the remaining space of my C disk is about 0.2Gb less than before.

Is it output to my C disk?If so,where is it?

I am searching for a long time on Net.Please help give some ideas how to achieve this. Thanks in advance !

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Upd:

There is my files on C disk.

I'm really sure that the remaining space of my C disk is much less than before.

Answer 1

Oh,maybe it's really on my Disk,I think.

But after restarting my PC,these spaces have been released,the remaining space of my disk is back to before.