#include <iostream>
using namespace std;
bool isItAVowel(char letter);
int main()
{
char input;
    while (1)
    {
      cout<<"Please enter a letter: (0 to quit)";
      cin >> input;
      if (input == '0') break;

      if (isItAVowel (input) )
        cout<<"Yes, your letter is a vowel."<<endl;
      else
        cout<<"No, your letter is not a vowel."<<endl;
    }
  return 0;
}
bool isItAVowel(char letter)
{  char vowels[10] = {'a','e','i','o','u','A','E','I','O','U'};
   bool found = false;
   char i;

    for (i = 0; i < 10; i++)
    {
    found = (vowels[i]);
        if (vowels == 'a','e','i','o','u','A','E','I','O','U')
        {
        found = true;
        }
   // Add code here:
   // Compare the letter to each element in the array
    }
   return found;
}