C program to check whether a character is vowel or consonant

PROGRAM-1:

#include <stdio.h>

int main()

{

    char c;

    int isLowercaseVowel, isUppercaseVowel;

    printf("Enter an alphabet: ");

    scanf("%c",&c);

    isLowercaseVowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' ||

    c == 'u');

    isUppercaseVowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' ||

    c == 'U');

    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.

PROGRAM-2:

#include <stdio.h>

#include <ctype.h>

int main()

{

    char c;

    int isLowercaseVowel, isUppercaseVowel;

    do {

        printf("Enter an alphabet: ");

        scanf(" %c", &c);

    }

    while (!isalpha(c));

    isLowercaseVowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' ||

    c == 'u');

    isUppercaseVowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || 

    c == 'U');

    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.