#include <iostream>
using namespace std;

//Declaring function isVowel so that main can call it
bool isVowel(char x);

int main() {
    //input character
    char c;
    
    //get user input
    cout << "Input a letter: ";
    cin >> c;
    
    //if isVowel (the function) returns true its a vowel so print that it is a vowel
    if (isVowel(c)) cout << endl << c << " is a vowel.";
    
    //if isVowel did not return true it returned false... could have use an else if here, but just else is sufficient
    else cout << endl << c << " is a consonant.";
    
    //keep program open
    cin >> c;
    return 0;
}

//isVowel definition... returns type bool, takes char type as an input
bool isVowel(char ch) {
     //if test on inputted ch char... uses | for or
     if ((ch == 'a') || (ch == 'e') || (ch == 'i') || (ch == 'o') || (ch == 'u') ||(ch == 'A') || (ch == 'E') || (ch == 'I') || (ch == 'O') || (ch == 'U')) return true;
     //if not true then return false
     else
     return false;
}