Write a C Program to Check Whether A Character is Vowel or Consonant?

In this Program, the if…else statement is used to check whether an alphabet entered by the user is a vowel or a constant. The five alphabets A, E, I, O and U are called vowels. All other alphabets except these 5 vowel letters are called consonants.

This program assumes that the user will always enter an alphabetic character.

Write a C Program to Check Whether A Character is Vowel or 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;

}

Output:

Case 1:

Enter an alphabet: G

G is a consonant.

Case 2:

Enter an alphabet: U

U is a vowel.

Explanation:

The character entered by the user is stored in variable c.

The isLowerCaseVowel evaluates to 1 (true) if c is a lowercase vowel and 0 (false) for any other character. Similarly, isUpperCaseVowel evaluates to 1(true) if c is an uppercase vowel and 0 (false) for any other character.

If both isLowercaseVowel and isUppercaseVowel is equal to 0, the test expression evaluates to 0 (false) and the entered character is a consonant.

However, if either isLowercaseVowel or isUppercaseVowel is 1 (true), the test expression evaluates to 1 (true) and the entered character is a vowel.

The program above assumes that the user always enters an alphabet. If the user enters any other character other than an alphabet, the program will not work as intended.