learning basic kotlin

Author: yrsdi

learning-kotlin-basic.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
+  </component>
+</module>

src/KotlinBasic.kt

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+fun main() {
+    //output text
+    var helloWorld: String = "Hello World"
+    println(helloWorld)
+
+    //input and output text
+    println("What is your name?")
+    var name = readLine()
+    println("My Name is,  $name")
+
+    // Data Type
+
+    // number
+    var age: Int = 30
+    // float or double
+    var priceDouble: Double = 100000.00
+    // literal
+    var binary: Int = 0b0101010101
+    var hexaColor: Int = 0x000FFFF
+    // Underscore on Decimal
+    var priceLong: Long = 9_0000_0000_000L
+    //Convertion
+    var ToByte: Byte = age.toByte()
+    var ToFloat: Float = age.toFloat()
+
+    println(ToFloat)
+    println(ToByte)
+    println(priceLong)
+    println(hexaColor)
+    println(binary)
+    println(priceDouble)
+
+    //Boolean
+    var yes: Boolean = true
+    var no: Boolean = false
+    println(yes)
+    println(no)
+
+    //Character
+    var y: Char = 'Y'
+    var a: Char = 'A'
+    var d: Char = 'D'
+    var i: Char = 'I'
+
+    println("$y$a$d$i")
+
+    //String
+    var firstName: String = "Yadi"
+    var lastName: String = "Rosadi"
+
+    var address: String = """ 
+        street not defined
+        west java
+        indonesia
+    """.trimIndent()
+    var fullName: String = "$firstName $lastName"
+    var lengthFullname: String = "$fullName length is ${fullName.length}"
+
+    println(lengthFullname)
+    println(firstName)
+    println(lastName)
+    println(address)
+    println(fullName)
+
+    //Variable
+
+    // Mutable
+    var thisIsMutable = "This is Mutable Variable"
+        thisIsMutable = "Variable can be change"
+    // Immutable
+    val thisIsImmutable = "This is Immutable Variable, Cannot be changed"
+
+    println(thisIsMutable)
+    println(thisIsImmutable)
+
+    //nullable
+    var nama:String? = null
+    nama="Yadi"
+
+    println(nama)
+    println(nama?.length)
+}