C Program – Check Whether a Character is Vowel or Consonant - If/Else & Switch

C Basics

Vowel or Consonant Using If-Else

#include <stdio.h>
int main() {
    char ch;
    printf("Enter an alphabet: ");
    scanf(" %c", &ch);
    if (ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u'||
        ch=='A'||ch=='E'||ch=='I'||ch=='O'||ch=='U') {
        printf("%c is a vowel\n", ch);
    } else {
        printf("%c is a consonant\n", ch);
    }
    return 0;
}
Enter an alphabet: e
e is a vowel

This method compares the input character against all vowels (both lowercase and uppercase). If none match, the character is considered a consonant.

Vowel or Consonant Using Switch

#include <stdio.h>
int main() {
    char ch;
    printf("Enter an alphabet: ");
    scanf(" %c", &ch);
    switch(ch) {
        case 'a': case 'e': case 'i': case 'o': case 'u':
        case 'A': case 'E': case 'I': case 'O': case 'U':
            printf("%c is a vowel\n", ch);
            break;
        default:
            printf("%c is a consonant\n", ch);
    }
    return 0;
}
Enter an alphabet: x
x is a consonant

A switch statement can simplify multi-branch checks. By grouping vowel cases together, the program prints a message when any vowel is matched and uses the default branch for consonants.


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