Count the vowels

Count the vowels (a e i o u) in a String, treating upper- and lower-case the same. Lower-case it first with s.toLowerCase(), then loop with s.charAt(i) and compare against each vowel.

Complete countVowels(String s) so it returns how many letters are vowels (a, e, i, o, u), ignoring case.

public class Text {
    public static int countVowels(String s) {
        return 0;   // change this
    }
}

Click Run to see the output here.

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Count the vowels

Count the vowels

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