In what case will the "end of file" be reached when reading data from the keyboard?

Question

C++ / C#

There is such a function for reading a string. The function inside is used fgets(). This function returns NULLif an error has occurred or the end of the file has been reached .
Under what conditions is "end of file" detected when reading from the keyboard?

char * s_gets(char * str, int n)
{
  char * return_value;
  int i = 0;

  return_value = fgets(str, n, stdin);

  if (return_value)
  {
    while (str[i] != '\n' && str[i] != '\0')
      i++;

    if (str[i] == '\n')
      str[i] = '\0';
    else
      while (getchar() != '\n')
        continue;
  }

  return return_value;
}

Answer 1

The standard end-of-file sign is Ctrl+Z. On Windows, you also need to press Enter or Ctrl+M.

Answer 2

If you have linux, then it will read up to the moment when you pressed enter, then it will return NULL. If you want to read long text, then use a loop like this: Then your text will be read in bursts of length n.