Android Development

  Formula to calculate leap year. Identify the year we want to know if its a leap year. We then divide the year by 4 to check if its evenly divisible. Then confirm that the year is not evenly divisible by 100. Check if the year is divisible by 400. If the year is evenly divisible by 4, then the year is a leap year. If the year is only evenly divisible by 100 and not evenly divisible by 400, then the year is not a leap year. package com.company ; import java.util.Scanner ; public class Main { public static void main ( String [] args ) { // write your code here int year ; Scanner sc = new Scanner ( System . in ); System . out . print ( "Enter year : " ); year = sc . nextInt (); if (( year % 4 == 0 ) && ( year % 100 != 0 ) && ( year % 400 != 0 )) { System . out . println ( year + " is Leap Year" ); } else { System . out . println ( year + " is Not L

  package com.company ; import java.util.Scanner ; public class Main { public static void main ( String [] args ) { // write your code here int a ; System . out . println ( "Enter a number : " ); Scanner sc = new Scanner ( System . in ); a = sc . nextInt (); if ( a % 2 == 0 ) { System . out . println ( "Even number" ); } System . out . println ( "Odd number" ); } } Enter a number : 23 Odd number Process finished with exit code 0

  //.If coast price and selling price of an item are input through the keyboard. // Write a program to determine whether the seller has made profit or incurred loss. // Also determine how much profit he made or loss he incurred. package com.company ; import java.util.Scanner ; public class Main { public static void main ( String [] args ) { // write your code here int costPrice , sellingPrice , profit , loss ; Scanner sc = new Scanner ( System . in ); System . out . print ( "Enter cost price : " ); costPrice = sc . nextInt (); System . out . print ( "Enter selling price : " ); sellingPrice = sc . nextInt (); if ( sellingPrice > costPrice ) { profit = sellingPrice - costPrice ; System . out . println ( "Seller has made profit : " + profit + " ₹ " ); } else { loss = costPrice - sellingPrice ; System . o

  TOAST   A Toast is short message display on the screen. Toast provide simple feedback message with a popup message. Toast automatically disappear after a timeout. Example :-   clicking  Send  on an email triggers a "Sending message..." toast. Context context = getApplicationContext (); CharSequence text = "Hello Shraddha Nand Pandey" ; int duration = Toast . LENGTH_SHORT ; Toast toast = Toast . makeText ( context , text , duration ); toast . show ();// in built function to show toast XML CODE:- <? xml version ="1.0" encoding ="utf-8" ?> < androidx.constraintlayout.widget.ConstraintLayout 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" tools :context =".MainActiv

 Dice Roller App using  Java In Android Studio <? xml version ="1.0" encoding ="utf-8" ?> < androidx.constraintlayout.widget.ConstraintLayout 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" android :background ="#29b6f6" tools :context =".MainActivity" > < ImageView android :id ="@+id/Image_view_dice" android :layout_width ="300dp" android :layout_height ="300dp" android :onClick ="play" android :src ="@drawable/one" app :layout_constraintBottom_toBottomOf ="parent" app :layout_constraintLeft_toLeftOf ="parent" app :layout_constraintR

 Music Player App in   Android Studio  Xml code:- <? xml version ="1.0" encoding ="utf-8" ?> < androidx.constraintlayout.widget.ConstraintLayout 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" tools :context =".MainActivity" > < TextView android :id ="@+id/textView" android :layout_width ="149dp" android :layout_height ="40dp" android :background ="#2196F3" android :gravity ="center" android :shadowColor ="#FFFFFF" android :text ="Music Player" android :textColor ="#FFFFFF" android :textSize ="24sp" android :text

 SWAPPING OF TWO NUMBER WITHOUT USING THIRD VARIABLE  (XOR Bitwise operator)  with the use of XOR bitwise operator we can swap two number without using third variable XOR(^) : help to inverse the binary or decimal number         ALGORITHM  Take two variable a and b assign value of a and b  (as we assign a=10 and b=15) then a = a^b ( value of a will change to 5 )           because   a  =10 =1 0 1 0  |    only one bit should be 1 so                           b =15 = 1 1 1 1  |    answer will be 1 or true                          a ^ b  =  0 1 0 1    .i.e. 5 now b = a^b (here a = 5 and b = 15) then, value of b =10           because    a  =5   =  0 1 0 1                               b =15 =  1 1 1 1                          a ^ b  =   1 0 1 0     a = a^b ( value of a will swap to 15)           because    a  =5   =  0 1 0 1                               b =10 =  1 0 1 0                         a ^ b  =   1 1 1 1   .i.e. 15   result a =15 and b=10 Java code    package com.company ; import