Not creating txt file in c drive by file operations in C language

Question

I am trying to create a simple text file using TurboC++ DOS emulator. But, it's not creating the file. I am referring to an online video where the same file is getting created. What can be the issue?

Below is the code:

#include<stdio.h>
#include<stdlib.h>

int main()
{
  int num;
  FILE *fptr;

  fptr = fopen("c:\\program.txt","w");

  if(fptr == NULL)
  {
    printf("error");
    exit(1);
  }
  printf("enter num = ");
  scanf("%d", &num);

  fprintf(fptr,"%d",num);
  fclose(fptr);

  return 0;

}

Answer 1

Although, this answer may no longer be required, I am providing it here for future reference of those who might need it.

I had the same problem some time ago.

It turns out the DOS emulator emulates the PC storage for programs.
The folder C:\TurboC++\Disk is treated as C:\ by TurboC++, and it is the root folder for whatever TurboC++ needs to refer to.

So, your file program.txt, should have the path [Your Installation Path]:\TurboC++\Disk when seen from outside TurboC++.