Last Vowel

Difficulty: ⚫◯◯◯

Tags: array, characters, search

Hurdle: Passing this question is sufficient to pass the arrays hurdle.

Description

Write a function last_vowel that takes a character array with exactly size elements.

The function should return the last vowel in the array.

If there are no vowels in the array, return '\0' (the null character).

Vowels: a, e, i, o, u (and their uppercase versions A, E, I, O, U)

Examples

Example 1

Input: {'h', 'e', 'l', 'l', 'o'}
Output: 'o'

Explanation: The last vowel in the array is 'o' at index 4.

Example 2

Input: {'b', 'a', 'n', 'a', 'n', 'a'}
Output: 'a'

Explanation: The last vowel is 'a' at index 5.

Example 3

Input: {'x', 'y', 'z'}
Output: '\0'

Explanation: No vowels in the array, so return the null character.

Example 4

Input: {'H', 'E', 'L', 'L', 'O'}
Output: 'O'

Explanation: Uppercase vowels count too. The last vowel is 'O'.

Example 5

Input: {'c', 'a', 't'}
Output: 'a'

Explanation: Only one vowel, 'a', so return it.

Example 6

Input: {'a', 'e', 'i', 'o', 'u'}
Output: 'u'

Explanation: All vowels, the last one is 'u'.

Function Signature

char last_vowel(int size, char array[MAX_COLS]);

Constants

#define MAX_COLS 100

Constraints

The array has at least 1 character.
The array has at most 100 characters.
Uppercase and lowercase vowels all count as vowels.
If no vowels exist, return '\0'.
Do not modify the array provided.
Do not call scanf, getchar, or fgets.
Do not call printf.

Hints

There are two approaches:

Approach 1: Traverse from beginning to end, update your answer every time you find a vowel. The last update will be the last vowel.

Approach 2: Traverse from end to beginning, return immediately when you find a vowel.

Testing

./last-vowel hello
o

./last-vowel banana
a

./last-vowel xyz
(null character - no output or special output)

./last-vowel HELLO
O

./last-vowel cat
a