Kotlin Basics

Author: smartherd

.idea/uiDesigner.xml

@@ -1,4 +1,6 @@
 
+// Hello World App
+
 fun main(args: Array<String>) {
     print("Hello World")
-}
+}

1_hello_world.kt renamed to src/1_hello_world.kt

@@ -0,0 +1,18 @@
+
+// Explore First App
+
+fun main(args: Array<String>) {
+
+    println("Hello World")
+
+    println(10)
+
+    println(true)
+
+    println(10 / 2)
+
+    println(94.2f)
+
+    println(9 - 3)
+
+}

src/2_explore_first_app.kt

@@ -0,0 +1,14 @@
+
+
+
+/*
+* This is comment line 1
+*
+* This is comment line 2
+*
+* This is main function. Entry point of the application. 
+* */
+
+fun main(args: Array<String>) {     // This is inline comment ...
+    print("Hello World")
+}

src/3_comments.kt

@@ -0,0 +1,19 @@
+
+/*
+* This is main function. Entry point of the application.
+* */
+fun main(args: Array<String>) {
+
+    var myNumber = 10       // Int
+    var myDecimal = 1.0     // Float
+    var isActive = true     // Boolean
+
+    var myString: String    // Mutable String
+    myString = "Hello World"
+    myString = "Another World"
+
+    val myAnotherString = "My constant string value"    // Immutable String
+//    myAnotherString = "some value"  // NOT ALLOWED, since it is immutable
+
+    print(myNumber)
+}

src/4_variables_data_types.kt

@@ -0,0 +1,17 @@
+
+
+/*
+* This is main function. Entry point of the application.
+* */
+fun main(args: Array<String>) {
+
+    var personObj = Person()
+    personObj.name = "Steve"
+
+    print("The name of the person is ${personObj.name}")
+}
+
+class Person {
+
+    var name: String = ""
+}

src/5_kotlin_basics.kt

@@ -0,0 +1,7 @@
+
+class Persson(var name: String ) {
+
+    fun display() {
+        print("The name of the person is ${name}")
+    }
+}

src/6_Person.kt

@@ -0,0 +1,10 @@
+
+/*
+* This is main function. Entry point of the application.
+* */
+fun main(args: Array<String>) {
+
+    var personObj = Persson("Steve")
+
+    personObj.display()
+}

src/6_kotlin_basics.kt

@@ -0,0 +1,21 @@
+
+/*
+* Explore Data Types in Kotlin
+* */
+
+fun main(args: Array<String>) {
+
+    var name: String
+    name = "Kevin"
+
+    var age: Int = 10
+    var myAge = 10
+
+    var isAlive: Boolean = true
+    var marks: Float = 97.4F
+    var percentage: Double = 90.78
+    var gender: Char = 'M'
+
+    print(marks)
+}
+

src/7_data_types.kt

@@ -0,0 +1,19 @@
+
+/*
+* Explore String Interpolation in Kotlin
+* */
+fun main(args: Array<String>) {
+
+    var rect = Rectangle()
+    rect.length = 5
+    rect.breadth = 3
+
+    print("The length of the rectangle is ${rect.length} and breadth is ${rect.breadth}. The area is ${rect.length * rect.breadth}")
+
+}
+
+class Rectangle {
+
+    var length: Int = 0
+    var breadth: Int = 0
+}

src/8_string_interpolation.kt

@@ -0,0 +1,28 @@
+
+
+/*
+* Explore Ranges
+* */
+fun main(args: Array<String>) {
+
+    var r1 = 1..5
+    // This range contains number 1, 2, 3, 4, 5
+
+    val r2 = 5 downTo 1
+    // This range contains number 5, 4, 3, 2, 1
+
+    val r3 = 5 downTo 1 step 2
+    // This range contains number 5, 3, 1
+
+    val r4 = 'a'..'z'
+    // This range contains the values from "a", "b", "c" . . . "z"
+
+    var isPresent = 'c' in r4
+
+    var countDown = 10.downTo(1)
+    // This range contains number 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
+
+    var moveUp = 1.rangeTo(10)
+    // This range contains number 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
+    
+}