to input any alphabet and check whether it is vowel or consonant.

#include <iostream>

using namespace std;


int main() {

    char alpha;

    bool lowercasevowel, uppercasevowel;


    cout << "Enter an alphabet: ";

    cin >> alpha;


   

   lowercasevowel= (alpha == 'a' || alpha == 'e' || alpha == 'i' || alpha == 'o' || alpha == 'u');

   uppercasevowel= (alpha == 'A' || alpha == 'E' || alpha == 'I' || alpha == 'O' || alpha == 'U');


   

    if (!isalpha(alpha))

      printf("wrong input");

    else if (lowercasevowel || uppercasevowel)

        cout << alpha << " is a vowel.";

    else

        cout << alpha << " is a consonant.";

    return 0;

}