Problem in Getting Menu Option

I'm currently doing an assignment but I've desperately to make this work:

Code:

---

int addString(void){

  char addAnother, str[100];

  do{
      printf("Enter string: ");
      gets(str);

      /* Some not important code here */

      printf("Add another? [Press Y for Yes]");
      addAnother = getchar();    /* Problem exist here */
  }while( (toupper(addAnother)) == Y );

  return 0;

}

---

Now, as I was asked to add another, I press 'y' then Enter and it will skip the gets() statement on top, like this:
Output:
------------------------------------
Add another? [Press Y for Yes]y
Enter string: Add another? [Press Y for Yes]
------------------------------------

I've tried to use getch() instead but end up the output like this:
------------------------------------
Add another? [Press Y for Yes]
Enter string: y
------------------------------------
which the y always appear after my 'Enter string' prompt (which I didn't want).

Is there any way that I can achieve this "menu selection" hassle?

Fixed code:

int addString(void)
{
char addAnother, str[100], character;

gets(0);
do
{
printf("Enter string: ");
gets(str);

/* Some not important code here */

printf("Add another? [Press Y for Yes]");
scanf("%c", &character);
if (character != 'Y') then break;
}while( (toupper(addAnother)) == Y );

return 0;
}

I think this is it. That "gets(0);" is before do{}while loop beacuse it clears all the characters that "scanf" command left them, if you know what I mean.

Alright! Someone found a practical use for gets. Though getchar would still work in clearing the newline left by scanf.
;) ;) ;) ;)

Thanks for the help! The program works fine :).

(P/S: Now I know why scanf and gets can't live together in my assignments :) )