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Programming Articles
Page 1127 of 2547
Read and Write Input in Dart Programming
Dart provides us with a standard library named 'io' which contains different classes and in turn, these classes contains different methods that we can use to read or write input from the terminal.We import the library in our program by making use of the import command.ExampleConsider the example shown below −Import 'dart:io';Writing something to the terminalWe can write something to the terminal by making use of the standard out class (stdout) that is available to us in the 'dart:io' library.ExampleConsider the example shown below −import 'dart:io'; void main(List arguments) { stdout.write('What is your name?\r'); }OutputWhat is your name?Note − ...
Read MoreReturn statement in Dart Programming
There are certain cases where we want to return a value from a given function so that we can use it later. These return values make use of a return keyword which in turn allows a function to return values.It should be noted that the return statement is optional, if not specified the function returns null.Also, only one return statement is allowed in a function.Syntaxreturn ;Syntax of a Dart function with a return value −returnType funcName(){ // statement(s) return value; }In the above syntax, the funcName is replaced with the name of our function. The returnType represents the type of data/expression ...
Read MoreExplain how Razor Pages work in ASP.NET Core
Razor Pages simplify the traditional MVC-based programming model by adopting a file-based routing. Razor Pages focus on page-based scenarios for building web applications rather than using controllers and views like a traditional ASP.NET MVC application.Once the application receives an HTTP request, it moves through the middleware pipeline until it reaches a middleware component that can handle and process it. Typically, it's a routing middleware that matches a URL path to a configured route. This route defines which Razor page to invoke for this particular request.Once the router has selected the Razor Page, the framework executes that Razor Page to generate ...
Read MoreString Interpolation in Dart Programming
There are times when we want to make use of variables inside the statement that is made up of string values.We know that we can add two strings together in Dart with the help of the + symbol operator. But to make use of a variable in between the strings that we are concatenating, we need to add one more + symbol and then type the name of the variable, which works okay when it comes to small statements.ExampleConsider the example shown below −void main(){ String name = "Tutorials"; var collegeName = "DTU"; print("Name is " + ...
Read MoreSuper constructor in Dart Programming
The subclass can inherit the superclass methods and variables, but it cannot inherit the superclass constructor. The superclass constructor can only be invoked with the use of the super() constructor.The super() constructor allows a subclass constructor to explicitly call the no arguments and parametrized constructor of superclass.SyntaxSubclassconstructor():super(){ }Though, it is not even necessary to use the super() keyword as the compiler automatically or implicitly does the same for us.When an object of a new class is created by making use of the new keyword, it invokes the subclass constructor which implicitly invokes the parent class's default constructor.Let's make use of an example where ...
Read MoreSuper keyword in Dart Programming
Super keyword in dart is used to refer to the parent's class object's methods or variables. In simple terms, it is used to refer to the superclass properties and methods.The most important use of the super keyword is to remove the ambiguity between superclass and subclass that have methods and variables with the same name.The super keyword is able to invoke the parent's objects method and fields, as when we create an instance of the subclass in Dart, an instance of the parent class is also created implicitly.Syntaxsuper.varName or super.methodNameAs we can access both the variables and methods of the parent's ...
Read MoreTernary Operator in Dart Programming
The ternary operator is a shorthand version of an if-else condition. There are two types of ternary operator syntax in Dart, one with a null safety check and the other is the same old one we encounter normally.Syntax 1condition ? expressionOne : expressionTwo;The above syntax implies that if a certain condition evaluates to true then we evaluate the expressionOne first and then the expressionTwo.ExampleLet's explore a Dart example where we make use of the above syntax of the ternary operator.Consider the example shown below −void main(){ var ans = 10; ans == 10 ? print("Answer is 10") : ...
Read MoreThis keyword in Dart Programming
This keyword in dart is used to remove the ambiguity that can be caused if the class attributes and the parameters have the same name. This keyword basically represents an implicit object pointing to the current class object.We usually prefix the class attribute with this keyword whenever we want to remove the ambiguity between the class attributes and the parameters.ExampleLet's take two examples of the case where the name of the class attribute and the parameters are the same.Consider the example shown below −void main() { Employee emp = new Employee('001'); emp.empCode = '111'; } class Employee ...
Read MoreHow to convert a list to JSON in R?
To convert a list to JSON, we can use toJSON function of jsonlite package. For example, if we have a list called LIST then it can be converted to a JSON by using the command toJSON(LIST,pretty=TRUE,auto_unbox=TRUE). We need to make sure that the package jsonlite is loaded in R environment otherwise the command won’t work.ExampleList
Read MoreFind Next Sparse Number in C++
In this problem, we are given an integer value N. our task is to create a program to find the next spares Number.Sparse Number is a special type of number whose binary conversion does not contain any adjacent 1’s.Example: 5(101) , 16(10000)Problem Description − For the given number N, we need to find the smallest number greater than N which is a sparse number.Let’s take an example to understand the problem, InputN = 7Output8ExplanationThe binary of 8 is 1000 which makes it the smallest sparse number greater than n.Solution ApproachA simple solution to the problem is checking for all numbers ...
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