C++ can't create txt files

Question

Code does not create .txt files to output

Updated: this code is working on friend's PC, but on on my PC. We both installed same mingw file. Both have Windows 11, both tried on VS code and Far Manager

Hi. Here is following code:

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <fstream>
using namespace std;
int main() {
 freopen("input.txt","r",stdin);
 int a,b;
 cin >> a >> b;
 cout << a + b << endl;
 freopen("output.txt","w",stdout);
 cout << a + b << endl;
}

Code succesfully read integers a,b from file input.txt and outputs them in console, but freopen it do nothing. I tried ofstream fout("output.txt") also and it did not work. I tried this in Visual Studio Code with Code Runner and Far Manager with than line on compilation used on both: g++ --std=c++17 !.! -DLOCAL -O2 -Wall -Wl,--stack=67108864 -o !.exe

For VS code I tried debug cwd (current working directory) and it was correct, I also checked .json files such as tasks.json and launch.json with it's cwd.

I have tried this code on Visual Studio (not VS code) and it worked! Maybe, the problem is in Windows 11? No antivirus programs on PC, no Windows Defender, no virtual machine, no windows 11 UAC.

Tried this code to get an error, but it seems like no errors occured.

 FILE* file = freopen("output.txt", "w", stdout);
 if (file == NULL) {
 perror("Error opening file\n");
 printf("errno: %d, description: %s\n", errno, strerror(errno));
 }
 else {
 printf("File reopened successfully.\n");
 }

• Pepijn Kramer: Why do you think you should use freopen (and std::cin, std::cout)? Use std::ofstream learncpp.com : 28.6 — Basic file I/O
• Pepijn Kramer: Recommendation : fully switch to "visual studio community edition" it is much more easy to use than "visual studio code"
• HMS Tree: ofstream do not work either. Visual Studio is not available on ICPC World Finals docs.icpc.global/worldfinals-programming-environment
• Some programmer dude: First of all, always check for failure. In your case check what freopen returns. If it fails, use strerror to get a printable string of the error from errno. And to emphasize what others have said, use standard C++ facilities for all your file input and output.
• Pepijn Kramer: ofstream should work, but be sure you set the "working directory" of your final directory to a place where you have rights to write files. Considering the link you sent : make sure you practice on Linux (so you are familiar with the linux file system behavior too).