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Articles on Trending Technologies
Technical articles with clear explanations and examples
C++ to perform certain operations on a sequence
Suppose, we are given an empty sequence and n queries that we have to process. The queries are given in the array queries and they are in the format {query, data}. The queries can be of the three following types−query = 1: Add the supplied data to the end of the sequence.query = 2: Print the element at the beginning of the sequence. After that delete the element.query = 3: Sort the sequence in ascending order.Note that, query types 2 and 3 always have data = 0.So, if the input is like n = 9, queries = {{1, 5}, {1, ...
Read MoreC++ Program to find out the maximum number of moves to reach a unblocked cell to another unblocked cell in a grid
Suppose, we are given a grid of dimensions h * w that contains two types of cells, blocked and unblocked. Blocked cells mean that the cells aren't accessible and unblocked means that the cells are accessible. We represent the grid in a 2D array where the blocked cells are given as '#' and the unblocked cells are given as '.'. Now, we have to reach from an unblocked cell to another unblocked cell in the grid. We can perform only two moves, we can either go vertical or we can go horizontal. We can't move diagonally. We have to keep ...
Read MoreHow to print all the elements of a String array in Kotlin in a single line?
In this article, we will take an example and show how to print all the elements of a String array in a single line using a Kotlin library class. In order to do that, we will use a String function called joinToString(), provided by the Kotlin library.As per the Kotlin documentation, the function definition looks like this −fun Array.joinToString( // the String will be separated by this separator: CharSequence = ", ", // This will be added as prefix to the String prefix: CharSequence = "", // This will be added as postfix ...
Read MoreHow to add an item to a list in Kotlin?
A List is a collection where you can store same type of data in one place. There are two types of lists in Kotlin −An Immutable list is something that cannot be modified. It is read-only in nature.The other type of list is mutable which can be modified.In this article, we will see how to create a mutable list and how to add an item to the existing list.Example – Adding an Item to a Mutable ListIn order to add an item to a list, we will be using add() that is provided by the Kotlin library class.fun main(args: Array) ...
Read MoreHow to get the current local date and time in Kotlin?
Kotlin is a statistically typed language and it is based on Java, hence all the Java codes can easily be compiled within Kotlin. In this article, we will see how we can generate the current local date and time in Kotlin.As Kotlin is interoperable with Java, we will be using the Java utility class and Simple Date Format class in order to get the current local date and time.Example – Current Date and time using SimpleDateFormatimport java.text.SimpleDateFormat import java.util.* fun main(args: Array) { val simpleDate = SimpleDateFormat("dd/M/yyyy hh:mm:ss") val currentDate = simpleDate.format(Date()) println(" Current Date is: ...
Read MoreHow to convert Int to Hex String in Kotlin?
Kotlin is statistically typed language and it is built on JVM. Kotlin is cent percent comparable with Java. Hence, some of the Java functions can be used in Kotlin as well.In this article, we will take an example to demonstrate how we can use a Java class function convert an Int in Kotlin to its correponding Hex String.Example – Converting Int to Hex String in KotlinIn this example, we will use the Java class function toHexString().import java.lang.* fun main(args: Array) { val hexString = java.lang.Integer.toHexString(-66) println("Hex String for negative Number: " +hexString) val positiveNumber ...
Read MoreKotlin 'when' statement vs Java 'switch'
Switch-case statement in any programming language allows the programmers to testify it against different values. It also provides an option to do something whenever the value of the variable does not match with a given value. In this article, we will take a simple example and demonstrate how we can implement the switch-case statement in Kotlin.Kotlin does not provide any option to write a switch-case statement. However, Kotlin provides an option to implement when() which works exactly the same way switch works in other programming languages.Example – Implementing switch-case in JavaIn this example, we will implement switch-case in Java.public class ...
Read MoreHow to reverse a Map in Kotlin?
Kotlin provides four types of constructors to define and manipulate a HashMap. In this article, we will see how we can reverse a map using Kotlin library function.A Map is a collection where data is stored as a key-value pair and the corresponding key has to be unique.A HashMap is a collection class based on MutableMap interface and it does that by implementing the MutableMap interface of HashTable.Example − Reverse using Iterable associate()In this example, we will create a HashMmap and we will reverse the same using associate(). In this method, we will be creating a new map and we ...
Read MoreHow to convert TimeStamp to DateTime in Kotlin?
Kotlin is a statistically typed language and it is based on Java, hence all the Java code can easily be compiled within Kotlin code. In this article, we will see how we can generate the current local date and time in Kotlin.As Kotlin is interoperable with Java, we will be using Java utility class and Simple Date Format class in order to convert TimeStamp into DateTime.Example – Converting DateTime using Java util classAs Kotlin is comparable with the JVM, we can use the Java util class in order to convert the TimeStamp into DateTime.import java.text.SimpleDateFormat import java.util.* fun main(args: ...
Read MorePrint 0001 to 1000 in Kotlin with padding
In this example, we will see how to print 0001 to 1000 in Kotlin with padding. For this purpose, we will use a Kotlin library function called padStart().padStart is a function which returns a charSequence. Its function definition looks like this −fun CharSequence.padStart( length: Int, padChar: Char = ' ' ): CharSequenceExample – Print 0001 to 1000 with paddingThe following code prints 1 to 1000 with padding.fun main(args: Array) { (1..1000).forEach{println("$it".padStart(4, '0'))} }OutputOn execution, it will print a sequence of 4-digit numbers starting from 0001 to 1000.0001 0002 0003 0004 ... ... ... 0996 0997 0998 0999 1000
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