C program to check whether a character is vowel or consonant

• In this  program we will discuss about how to check whether a character is vowel or consonant.
• In English language will be having 5 vowels and 21 consonants.
• To check entered character is vowel or consonant, first Read input character from user using scanf.
• There are only 5 vowels(A,E,I,O,U), so we need to check entered character is there in those 5 characters.
• If it is present then we can say its an vowel, otherwise it is a consonant.
• While checking we need to consider case sensitivity. So we need to check both uppercase vowels and lower case vowels.
• Lets see an example program to check whether entered character is vowel or not.

Write a program to determine whether the input character is a vowel or consonant or not an alphabet

1. #include <stdio.h>
2. //write a program to determine whether the input character is a vowel or consonant or not an alphabet
3. //c program to check whether a character is vowel or consonant
4. //www.InstanceofJava.com
5. int main() {
6.     char character;
7.     int lowercaseVowel, uppercaseVowel;
8.     printf("Enter a character  ");
9.     scanf("%c", &character);
10. 
    
11.     // assigns 1
12.     lowercaseVowel = (character == 'a' || character == 'e' || character == 'i' || character == 'o' || character == 'u');
13. 
    
14.     // evaluates to 1 if variable c is a uppercase vowel
15.     uppercaseVowel = (character == 'A' || character == 'E' || character == 'I' || character == 'O' || character == 'U');
16. 
    
17.     // evaluates to 1 (true) if c is a vowel
18.     if (lowercaseVowel || uppercaseVowel)
19.         printf("%c is a vowel.", character);
20.     else
21.         printf("%c is a consonant.", character);
22.    getch();
23. }

Output:

1. Enter a character
2. I
3. I is an vowel