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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.


Related Topic: Write a C Program to Check whether the entered value is Alphabet or Not?

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