Kotlin program uses loops to display characters from A to Z

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In this program, you will learn to use while loops to print English letters in Kotlin. You will also learn to print only uppercase and lowercase letters.

Example1Display uppercase A to Z

fun　main(args:　Array<String>)　{
　　　　var　c:　Char
　　　　c = 'A'
　　　　while (c <= 'Z') {
　　　　　　　　print("$c　")
　　　　　　　　++c
　　　　}
}

When the program is run, the output is:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Like Java, you can use a for loop to iterate from A to Z, because they are stored as ASCII characters in Kotlin.

Therefore, internally, you can loop to display65to90 to print English letters.

Here is the equivalent Java code:Java Program to Display English Letters

Make slight modifications, and you can display lowercase letters, as shown in the following example.

Example2：Display lowercase a to z

fun　main(args:　Array<String>)　{
　　　　var　c:　Char
　　　　c　=　'a'
　　　　while　(c　<=　'z')　{
　　　　　　　　print("$c　")
　　　　　　　　++c
　　　　}
}

When the program is run, the output is:

a b c d e f g h i j k l m n o p q r s t u v w x y z

You just need to replace 'A' with 'a' and 'Z' with 'z' to display lowercase letters. In this example, in the inner loop97to122.

Kotlin Examples in Full