1)Variable Code: package com.example.operator fun main() { var name:String name= "John" name= "Roma" val rollno:Int rollno= 12 println (name) println (rollno) } data class Demo( val name :String= "N/A" ) Output: 2)Operator Arithmetic operation package com.example.operator fun main() { var x = 200 var y = 100 var sum = x + y println (sum) } data class Demo( val name :String= "N/A" ) Output: 3)Function package com.example.operator fun main(args: Array){ result () print ( "Result after subtraction" ) } fun result(){ var num1 = 1700 var num2 = 68 println ( "result = " +(num1 - num2)) } data class Demo( val name :String= "N/A" ) Output: If - else program package com. example.operator fun main(args: Array) { val num1 = 90 val num2 = 100 val result = if (num1 > num2) { " $ num1 is greater than $ num2 " } else { " $ num1 is smaller than $ num2 " } println (result) } data class Demo( val name :String= "N/A" ) Ouput: Kotlin Loop program Code: - package com.example.operator fun main() { val nums = arrayOf ( 1 , 5 , 10 , 15 , 20 ) for (x in nums) { println (x) } } data class Demo( val name :String= "N/A" ) Output: Kotlin when program Code: package com.example.operator fun main() { val day = 4 val result = when (day) { 1 - > "Monday" 2 - > "Tuesday" 3 - > "Wednesday" 4 - > "Thursday" 5 - > "Friday" 6 - > "Saturday" 7 - > "Sunday" else - > "Invalid day." } println (result) } data class Demo( val name :String= "N/A" ) Output: Hello world program. Activitymai n.xml < RelativeLayout xmlns: android ="http://schemas.android.com/apk/res/android" xmlns: app ="http://schemas.android.com/apk/res - auto" xmlns: tools ="http://schemas.android.com/tools" android :layout_width ="match_parent" android :layout_height ="match_parent" > < TextView android :layout_width ="wrap_content" android :layout_height ="wrap_content" android :layout_alignParentStart ="true" android :layout_alignParentTop ="true" android :layout_marginStart ="6dp" android :layout_marginTop ="58dp" android :text ="Hello World!" app :layout_constraintBottom_toBottomOf ="parent" app :layout_constraintEnd_toEndOf ="parent" app :layout_constraintStart_toStartOf ="parent" app :layout_constraintTop_to TopOf ="parent" /> MainActivity.kt package com.example.helloworld import androidx.appcompat.app.AppCompatActivity import android.os.Bundle class MainActivity : AppCompatActivity() { override fun onCreate( savedInstanceState: Bundle?) { super .onCreate(savedInstanceState) setContentView(R.layout. activity_main ) } } AndroidManifest.xml < manifest xmlns: android ="http://schemas.android.com/apk /res/android" xmlns: tools ="http://schemas.android.com/tools" > < application android :allowBackup ="true" android :icon ="@mipmap/ic_launcher" android :label ="@string/app_name" android :supportsRtl ="true" android :th eme ="@style/Theme.Helloworld" tools :targetApi ="31" > < activity android :name =".MainActivity" android :exported ="true" > < intent - filter > < action android :name ="android.intent.action.MAIN" /> < category android :name ="android.intent.category.LAUNCHER" /> String.xml file < resources > < string name ="app_name" >Hello world program < string name ="hello_world" >Hello world!!! < string name ="menu_settings" >Setting < string name ="title_activity_main" >MainActivity Output: Text view pro gram A ctivitymain.xml file Main Actiuvity.kt package com.example.sycspractical2ic import 25ndroid.appcompat.app.AppCompatActivity import android.os.Bundle import android. widget.TextView import android.widget.Toast class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) //accessing our 25ndroid25 from layout val textView = findViewById(R.id.text_view_id) textView.setOnClickListener{ Toast.makeText(this@MainActivity, R.string.text_on_click, Toast.LENGTH_LONG).show() } } } String .xml file SYCSPractical2ic www. bkbirla .com COMPUTER SCIENCE PORTAL AndroidM anifest.xml file Output: EditT ext Program Acti vityMain.x ml file

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