declare and initialize variable and use of conditions in kotlin

Author: hussainsherwani

.idea/uiDesigner.xml

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+/**
+ * Created by Hussain Sherwani
+ * at 10:30 AM on 1/3/2018
+ * [email protected] .
+ */
+fun main(args: Array<String>) {
+    println("Hello Word.... :) Welcome to the Kotlin world")
+}

.idea/vcs.xml

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+package com.kotlin
+
+/**
+ * Created by Hussain Sherwani
+ * at 11:05 AM on 1/3/2018
+ * [email protected] .
+ */
+var a : Int = 500
+val b : Int = 600
+fun main(args: Array<String>) {
+
+    // as we declare a is `var` so this is mutable we can change the value
+    a=700
+    // As variable b is declared with `val` so this is immutable and its value cannot change ... bellowed line give compile time error
+//    b=800
+    println("value of A is $a and value of B is $b")
+}

src/com/kotlin/HelloWord.kt

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+package com.kotlin.conditions
+
+/**
+ * Created by Hussain Sherwani
+ * at 12:34 PM on 1/3/2018
+ * [email protected] .
+ */
+fun main(args: Array<String>) {
+    val age: Int = 42
+    if (age < 18) {
+        print("You can not register")
+    } else if (age < 20) {
+        print("You should not register")
+    } else if (age < 30) {
+        print("You should  be able register")
+    } else if (age < 40) {
+        print("You can register")
+    } else {
+        print("You can not register easily")
+    }
+}

src/com/kotlin/VariableDeclarations.kt

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+package com.kotlin.conditions
+
+/**
+ * Created by Hussain Sherwani
+ * at 12:37 PM on 1/3/2018
+ * [email protected] .
+ */
+fun main(args: Array<String>) {
+
+//    To use Switch statement in kotlin we use `when` keyword
+//    val mod: Int = 6
+//    when (mod) {
+//        1 -> println("The mode is lazy")
+//        2 -> {
+//            println("The mode is 2")
+//            println("so the mode is busy")
+//        }
+//        3 -> println("The mode is super productive")
+//        else -> println("I don't know what the fuck mode is now")
+//    }
+//
+        val x = 10
+    when(x){
+        5-> println("X is 5")
+        3*12 -> println("3 *12")
+        "Hey there ".length -> println("X is the length of string'Hey There'")
+        in 1..10 -> println("X is between one and 10")
+        in 11..20 -> println("X is between 11 and 20")
+        in 21..30 -> println("X is between 21 and 30")
+        !in 1..9 -> println("X is not in 1 to 9")
+    }
+}

src/com/kotlin/conditions/If_Condition.kt

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+package com.kotlin.conditions
+
+import java.util.*
+
+/**
+ * Created by Hussain Sherwani
+ * at 1:02 PM on 1/3/2018
+ * [email protected] .
+ */
+fun main(args: Array<String>) {
+    val random = Random().nextInt(50)
+    when (random) {
+        in 1..10 -> println("Random number is between one an ten")
+        in 11..20 -> println("Random number is between eleven an twenty")
+        in 21..30 -> println("Random number is between twenty one an thirty")
+        in 31..40 -> println("Random number is between thirty one an forty")
+        in 41..50 -> println("Random number is between forty one an fifty")
+    }
+}