Check Vowel or consonant

Check Vowel or consonant:

#include <stdio.h>

int main()

{

    char c

    int n1,n2;

    printf("Enter any alphabet: ");

    scanf("%c",&c);

     n1= (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');

     n2 = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');

     if (n1 || n2)

        printf("%c is a vowel.",c);

    else

        printf("%c is a consonant.",c);

    return 0;

}