do-while isn't working help

please help me...the do-while loop will not work
It will go through properly the first time and then the "Want to enter another comes up but if you enter "1" it will ask again "Want to enter another" it won't go through the program...but if you enter "2" it will exit the program

Code:

---

int main()
{
        int again;        //user input which determines if they want to enter another sentence
    char sentence[81];        //user inputs sentence
       
        do
        {
                system("cls");
                cout << "Do you want to enter a word or sentence up to 80 characters: " << endl;
                gets(sentence);

                encrypt(sentence);                //calls function encrypt
                decrypt(sentence);                //calls function decrypt
       
                cout << "Want to enter another? (press 1 - Yes, 2 - No)" << endl;
                cin >> again;
               
        }
        while (again == 1);
        return 0;
}

void encrypt(char sentence[])
{
        for (int i = 0; i < strlen(sentence); i++)
        {
                sentence[i] = sentence[i] + 3;

        }
        cout << sentence << endl;
}

 
void decrypt(char sentence[])
{
        for (int i = 0; i < strlen(sentence); i++)
        {
                sentence[i] = sentence[i] - 3;
        }
        cout << sentence << endl;
}

---

Code:

---

do
{
  system("cls");
  cout << "Do you want to enter a word or sentence up to 80 characters: " << endl;
  cin.getline(sentence, 81);  // don't use gets() (see faq )

  encrypt(sentence);                //calls function encrypt
  decrypt(sentence);                //calls function decrypt
       
  cout << "Want to enter another? (press 1 - Yes, 2 - No)" << endl;
  cin >> again;
  cin.ignore();      // this code seems to fix it
               
} while (again == 1);

---

Thank you very much it works great now