c program to check an alphabet is vowel or consonant 

Enter any alphabet then it will give an alphabet is vowel or consonant.vowel are a,e,i,o,u.and rest all the alphabets are consonant. 

#include <stdio.h>

int main()

{

    char c;

    int isLowercaseVowel, isUppercaseVowel;

    printf("Enter an alphabet: ");

    scanf("%c",&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;

}