Flushing stdin after every input - which approach is not buggy?

Question

After Mark Lakata pointed out that the garbage isn\'t properly defined in my question I came up with this. I\'ll keep this updated to avoid confusions.

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Answer 1

You should use getline/getchar:

#include 

int main()
{
  int bytes_read;
  int nbytes = 100;
  char *my_string;

  puts ("Please enter a line of text.");

  /* These 2 lines are the heart of the program. */
  my_string = (char *) malloc (nbytes + 1);
  bytes_read = getline (&my_string, &nbytes, stdin);

  if (bytes_read == -1)
    {
      puts ("ERROR!");
    }
  else
    {
      puts ("You typed:");
      puts (my_string);
    }

  return 0;