Showing posts with label En. Show all posts
Showing posts with label En. Show all posts

Using String Variable with Kotlin Programming Language |Part-2|

String Variable with Kotlin

Greetings!

Hello Everyone here, Creating another video to demonstrate how to use String Variables in Android Studio using Kotlin Programming language.



 

Environment

Software: Android Studio
Programming Language: Kotlin

Summary

Its a beginner example and Part two of my Kotlin Programming Guide.

To declare any variable in Kotlin, you can simply use two keywords.

Var and Val

First, we are going to use Var Variables is the General variable that can be changed anytime throughout the Kotlin programming.

However, the Val variables are the constraint variables and can be declared only once.

Practice tasks

1. Open Android Studio and go to your project > Java > <com.folder> and edit the Kotlin file to create the variable:

fun main()
{
var name = "James"
val lname = "McDonald"
println(name)
println(lname)
}

Result: Run the compilation and see what happens, Check for error and update it here in comments.

2. Try to reassign a new value to the "var" variable name and the "val" variable lname and see if we can change the value at the later point during our program.

Result: Share the error, if any.

3.  Assign null values to the variables and check out for the outcome. Check for error.
Assign null String declaration to the available by using

:String? Next to the variable name.

Result: Share the error, if any.

We can also assign variables outside the function as well using this method variable will be easily accessible to the other Functions throughout the program.

While declaring the string variable, you may think about how the program decides what kind of variable it. Kotlin chooses the type of variable with very first user input. Like when you mentioned string value to the variable with the quotes that time it assigned, they string type to the variable, and that variable name will remain String Variable throughout the program.
Similarly, if we are going to assign Integer or Float value to the variable for the very first time, it will take is as the Float/Integer variable. We will discuss other types of variables in another post in more detail.

Kotlin - Control Statements |Part - 3|

Control Statements Part-3

In Kotlin Programming language, the Control Statements are similar as in most of the programing language.
Control Statements are the conditional statements that let us create a set of options to make a decision to produce the choice of output if a different type of input supplied to the program.




The Conditional Statements are 
  • if Statement
  • if-else Statement
  • if-else as expression
  • when Statement

if Statement: 

In an, if Statement, program checks for the Condition to match with the given option if matches then perform the activity following it

Syntax

if(<condition>)

{
    <Set of activity>
}

Example 1:

val name: String? = "James"
val lname = "McDonald"
var newVar: String? = null 
 
fun main()
{
if (name == "James")newVar = "Yes the name is " + name 
println(newVar)
}

Example 2:

var newVar: String? = null
var y = 20 
var x = 10
 
fun main() {
if (x > y) newVar = "x is greater number " + x
if (x < y) newVar = "Y is greater number " + y
println(newVar)
}


if-else Statement:

In an if-else statement, program checks for the Condition to match with the given option if matches then perform the activity follows it, if not matches the Condition, then conducts the other event.  

The syntax used for if the Statement is as below: 

if(<condition>) <Set of activity>
else <set of activity>

Example 1:

var newVar: String? = null
var y = 20 
var x = 10
 
fun main()
{
if (x > y) newVar = "x is greater number " + y
else newVar = "Y is greater number " + y
println(newVar)
}

Example2:

val name: String? = "James"
val lname = "McDonald"
var newVar: String? = null
fun main()
{
    if (name == "James")newVar = "Yes it is " + name
    else newVar == "No it is the Something else"

println(newVar)
}

if-else Statement as an expression:

In an if-else statement, it is just like the usual if-else Statement, but in this one, we use curly braces to supply multiple expressions instead of a single line of expression.

Syntax:

if(<condition>)
{
    <Set of activity>
}
else{
    <Set of activity>
}

Example 1:

val name: String? = "James" 
val lname = "McDonald"
var newVar: String? = null
fun main() { if (name == "James") { newVar = "Yes it is " + nameprintln(newVar) } else { newVar == "No it is the Something else"println(newVar) } }

Example 2:

var newVar: String? = null
var y = 20 
var x = 10
fun main() {
 
if (x > y)
{
newVar = "x is greater number " + y 
println(newVar)
}
 
else
{
newVar = "Y is greater number " + y 
println(newVar)
}
}

when Statement:

In a when Statement, program checks for the Condition to match with the multiple options to make a choice, when it matches one of the options, then it performs the activity following the decision.  

Syntax:

when(<variable>)
{
    <variable condition> -> <output>
    <variable condition> -> <output>
    <variable condition> -> <output>
    <variable condition> -> <output>
    else -> <output>
}

Example:

fun main() {
    when(x)
    {
        1 -> println("You selected  1")
        2 -> println("You selected  2")
        3 -> println("You selected  3")
        4 -> println("You selected  4")
        else -> println("Invalid range outside 1 to 4")
    }
}

Kotlin Program "Hello World" codded using Android Studio |Part-1|

Kotlin- Part 1

Introduction: 

 This article describes how to compline Kotlin programming inside the Android Studio for beginners tutorial.

Environment:

OS: Windows 10
Application: Android Studio

Description:

Kotlin is an alternative JVM programing language to create Android Application.

Most of the learners start learning Kotlin with IntelliJ and later start to work on Android Studio.

However, the learners can, from the beginning, learn this on Android studio.

In a small series of tutorials on Kotlin Programming, we introduced the tutorial to do a Kotlin Programming directly on Android Studio. In Part-1, we have a quick demonstration of running a "Hello World" program in the Android Studio application.

Kotlin Programming using Android Studio:




We welcome all our viewers to watch the video of the easy to use Kotlin programming to print "Hello World" into the Android Studio Terminal.

Some related questions:


What is IntelliJ?
Answer: IntelliJ is an Integrated Development Environment(IDE) software written in Java for making software. It was developed by Jetbrains(formally known as IntelliJ) in 2001 to Develop Java-based software with more sophistication; to learn more about IntelliJ history, please visit the Wiki link for IntelliJ.
What is Android Studio?

Android Studio is another IDE that is based upon IntelliJ and is specifically designed to create Android-based applications.
Wiki link to Android Studio.

What is Kotlin?

Java is a language that we still use to create as a preferred language to make Android applications. However, Jetbrains developed the programming language as an alternative to Java named it as Kotline, a new language buddle with more sophistication, ease, and it supports multiple platforms.
Wiki Link to Kotlin

 

What is the LifeSpan of Corona Virus on the surface of Mobiles, computers, and Gadgets?

The Novel Corona Virus COVID-19


The World Health Organisation (WHO) declared COVID-19 as the pandemic, and we know it is a global concern, and the impact is visible in many countries. The source of the Virus is still unknown. The scientists are estimating that it may have originated from China, where the first of such a case was reported and may be the result of the fact that Chinese people are habituated to it the animals who are the host of Coronavirus family, especially Snakes and Bats.  

Social Media Question

What is the full form of COVID 19?

Answer: Corona Virus Diseases, 2019.

Who is the Host of the Virus?

This Virus is not Airborn; that means it is not in the environment like regular viral flu, but it is a contagion that means it can be transferred from one patient to another patient.
We first need to understand how this Virus lives and survive in our body and how it infects others.

How This Virus Spread?

This Virus infects the lungs, nose, and throat; basically, the respiratory organs of the body, just like any other flu, show early symptoms of cough, cold, and flu. At a later stage, its cells start to regenerate inside the body at such a fast speed that it causes pneumonia and creates a life-threatening situation. Sneeze and cough cause tiny droplets containing the Virus, which is touched by the healthy person, and once his hand reaches around respiratory parts like nose or mouth, he infects himself.

Main Problem with this Virus - Why are we not able to control it?

This Virus survives for more than 3-4 days on the surface, and it is invisible due to which many people unknowingly come in contact with it and spread infection by infecting themself.

Why LockDown is the only resort?

Because we don't have a cure, the only way to survive is to break the chain of its spread by locking ourselves for the time all the patients are identified & quarantined.
Why we are not able to identify the patients without Lockdown. Most of the patients are showing the symptoms post 12 days during this period; they coughing and sneezing and laying the Virus on their surroundings.
Some people causing the further delay, because they are afraid and unaware of the situation, and the psychology of thinking that reporting the flu to the medical institutions which are full of COVID-19 patients is a hub, and they may get infected.
Delay in reporting of the decease cause delay in the treatment which results in an emergency, along with it there are chances of patients infecting a lot of people around him.
So it is crucial to lock ourselves for good 21 days or more if needed, completely isolate ourselves and in between if required medical help, report it immediately so that we can reduce the impact as soon as possible.

What is the lifespan of the COVID-19 Virus?

We should know the lifespan of this Virus on the surface of different objects, especially the necessary devices on which we spend most of our time & touch them again and again. 
For example, the surface of the table, knobs glass, water bottle, keyboard, mouse, power button, and switchboards, etc...
To answer this question accurately, we checked the report shared by WHO and sharing some details.
The old Report from World Health Organisation (WHO) suggested that the original SARS-CoV virus identified in the year 2003 has a lifetime on the glass surface for up to four full days, which makes it 96 hours.
For the Plastic Surface, it has a lifespan of 72 hours that makes it 3 days.
Similarly, In the recent study conducted by the United States' National Institutes of Health, and conveyed to the WHO reports that the new coronavirus (SARS-CoV-2) also lives on the surfaces like steel and hard plastic for about 72 hours (three days), same as the SARS-CoV virus.
Also, when tested on cardboard(you might be taking deliveries), it has a lifespan of 24 hours, and on copper, the Virus lives for 4 hours.
However, the new studies from the United States National Institutes of Health did not test it on Glass surface; hence we can consider the same as SARS-COV-2 as the other test factors match with COVID-19.
Finally, the best practice to be safe is social distancing and isolation for some time.
We give credit to the United States National Insitute of Health for sharing their research & providing us a better idea about the virus life span and helping us to be more aware of sanitizing the surface.
So far, We do not have any effective cure for the Corona Virus Pandemic, the only best way to rescue ourselves is by keeping the social distance between people, and by maintaining strict hygiene by covering ourselves with the protective shields like masks and sanitizer.

How to Mobile View webpages on Desktop browser on Windows PC - answered.

Here we are with another fantastic trick which you can make use of for viewing your webpage's mobile design from your desktop computer. It is to change view settings of the Browser from desktop to Mobile.

Earlier, If you have gone through our previous blog post, you will find we had posted a desktop view on mobile Browser.
This time Mobile view on a desktop browser. Just the reverse of what we did last time.

This time I will recommend you use Chrome Browser on the desktop for this purpose.

Open Chrome browser, and under it, you will find. 3, dots button ... Button on the top right corner to open settings, click on it, it will give drop-down list select "More Tool" from there select "Developers Tool" in developer tool right Windows pane you will be able to see small Mobile/Tablet Icon click on it. That's it. Now enjoy the Mobile view on your desktop Windows browser.

This step is useful when you want to hide your platform from the responding website, checking mobile views of sites, or you directly want to download windows 10 ISO.

You may find it helpful for different purposes.

Please share if you find our staff helpful.

Tips:
1. Short cut to open developer console on most of the Browser is "F12" Key.
2. The same feature is also a part of Firefox, Internet Explorer, Edge, and other browsers as well.

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