Program to Check Vowel or consonant 2

#include <stdio.h>
#include <ctype.h>

int main()
{
    char c;
    int isLowercaseVowel, isUppercaseVowel;

    do {
        printf("Enter an alphabet: ");
        scanf(" %c", &c);
    }
    // isalpha() returns 0 if the passed character is not an alphabet
    while (!isalpha(c));

    // evaluates to 1 (true) if c is a lowercase vowel
    isLowercaseVowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');

    // evaluates to 1 (true) if c is an uppercase vowel
    isUppercaseVowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');

    // evaluates to 1 (true) if either isLowercaseVowel or isUppercaseVowel is true
    if (isLowercaseVowel || isUppercaseVowel)
        printf("%c is a vowel.", c);
    else
        printf("%c is a consonant.", c);
    return 0;
}

Output

Enter an alphabet: G
G is a consonant.