c language : fwrite doesnt do anything

Question

{
    FILE* f1 = fopen("C:\\num1.bin", "wb+");//it will create a new file 
    int A[] = { 1,3,6,28 }; //int arr
    fwrite(A, sizeof(A), 1, f1); //should insert the A array to the file
}

I do see the file but even after the fwrite, the file remains empty (0 bytes), does anyone know why?

Answer 1

You need to close the file with fclose

Otherwise the write buffer will not (necessarily) force the file contents to be written to disk