Kotlin program to check if a letter is a vowel or consonant

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In this program, you will learn to use the if..else and when statements in Kotlin to check if a letter is a vowel or consonant.

Example1：Check if a letter is a vowel or consonant using the if..else statement

fun　main(args:　Array<String>)　{
　　　　val　ch　=　'i'
　　　　val　vowelConsonant　=　if　(ch　==　'a'　||　ch　==　'e'　||　ch　==　'i'　||　ch　==　'o'　||　ch　==　'u')　"vowel letter"　else　"consonant letter"
　　　　println("$ch　is　$vowelConsonant")
}

When running the program, the output is:

i　is　a　vowel　letter

In the above program, 'i' is stored in the char variable ch. In Java, double quotes (" ") are used for strings, and single quotes (' ') for characters.

Now, to check if ch is a vowel, we check if ch is any of the following: ('a', 'e', 'i', 'o', 'u'). Unlike Java, this is done using an if..else expression rather than an if..else statement.

If the letter is any vowel, return the string "vowel letter". Otherwise, return the string "consonant letter".

We can also use the when statement in Kotlin to check if a letter is a vowel or consonant.

Example2：Check if a letter is a vowel or consonant using the when statement

fun　main(args:　Array<String>)　{
　　　　val　ch　=　'z'
　　　　when(ch)　{
　　　　　　　　'a', 'e', 'i', 'o', 'u'　->　println("$ch　is a vowel letter")
　　　　　　　　else　->　println("$ch　is a consonant letter")
　　　　}
}

When running the program, the output is:

z is a consonant letter

In the above program, we did not use a long if condition, but replaced it with a when statement. When is similar to the switch case in Java.

But, when is not just a statement, it is also an expression, which means we can return and store values from the when statement.

Therefore, in the program, when ch is any of the following: ('a', 'e', 'i', 'o', 'u'), it will output a vowel. Otherwise, the else part will execute and the consonant will be printed on the screen.

This is equivalent Java code: Check Java inis a Vowel or Consonant

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