C Programming Code Examples

C > If Else and Switch Case Code Examples

C program to check vowel or consonant

C program to check vowel or consonant

Write a C program to check whether an alphabet is vowel or consonant using if else. How to check vowels and consonants using if else in C programming. C Program to input a character from user and check whether it is vowel or consonant.

English alphabets a, e, i, o and u both lowercase and uppercase are known as vowels. Alphabets other than vowels are known as consonants.

    Input a character from user. Store it in some variable say ch.
    Check conditions for vowel i.e. if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u'), then it is vowel.
    If character is alphabet but not vowel then it is consonant. Means check ch >= 'a' && ch <= 'z' then, it is consonant.
    If it is neither vowel nor consonant, then it is not alphabet.

Character in C is represented inside single quote. Do not forget to add single quote whenever checking for character constant.

Let us implement the logic with both lower and upper case alphabets.

#include <stdio.h>

int main()
{
    char ch;

    /* Input character from user */
    printf("Enter any character: ");
    scanf("%c", &ch);

    /* Condition for vowel */
    if(ch=='a' || ch=='e' || ch=='i' || ch=='o' || ch=='u' || 
       ch=='A' || ch=='E' || ch=='I' || ch=='O' || ch=='U')
    {
        printf("'%c' is Vowel.", ch);
    }
    else if((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'))
    {
        /* Condition for consonant */
        printf("'%c' is Consonant.", ch);
    }
    else 
    {
        /*
         * If it is neither vowel nor consonant
         * then it is not an alphabet.
         */
        printf("'%c' is not an alphabet.", ch);
    }

    return 0;
}