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Articles on Trending Technologies
Technical articles with clear explanations and examples
Difference Between LinkedList and LinkedHashSet in Java
LinkedList and LinkedHashSet are two important classes of Java's Collection framework. They are used to store groups of items, but they work in different ways and have their own unique features. What is a LinkedList in Java? Java LinkedList is a linear data structure that is used to store the same type of elements. It is a part of the Java Collections Framework, and it implements the List as well as the Deque interfaces. It has a dynamic size, which means it can grow and shrink as needed. Example The following is an example of how we write code for ...
Read MoreWhat is the proper declaration of main in C++?
The main() function is the entry point of every C++ program where execution begins. It is invoked automatically when the program is executed. The main() function returns the execution status to the operating system (indicating whether the program executed successfully or not). You can also use optional command-line arguments, argc and argv, to pass values to the program. Declaration /Prototype of main() The standard prototype of main() function is as follows: int main() { body } Or, int main(int argc, char *argv[]) { body } Here, argc : Number of arguments passed to the program from the environment ...
Read MoreHow to call a parent class function from derived class function in C++?
In the OOPs concept of C++, the parent class represents the root of the hierarchy while the derived class is inherited from the parent class. The derived class is presented using the scope resolution operator (::). The derived class is also known as the child class or subclass. What is Parent Class? The parent class is also called a base class used to design the structure of variable and function initialization based on access specifiers (private, public, and protected). Syntax Following is the syntax of parent class in C++: class ParentClass { // Access specifiers: ...
Read MoreStrand sort in C++
In C++, the strand sort is a recursive sorting algorithm. It is used to extract increasing subsequences repeatedly (called strands) from the input list and merge them into a sorted list. There are multiple libraries that can be used for different purposes. This sorting is one of them. This sorting technique is particularly good for sorting linked lists, but can be used with arrays too. The following is a list of approaches for strand sorting in C++: These approaches is to extract sorted strands (in increasing/descending order) from the unsorted list and merge them one by one into a final ...
Read MoreC++ Program to Find Factorial of Large Numbers
A factorial of a number defines the non-negative integer say n that calculate the product of a number by every positive integer until it reaches 1. The symbol of factorial is (!). Mathematically, it is represented by: n! = n x (n-1) x (n-2) x ... x 1 For eg. factorial of an integer 30! = 265252859812191058636308480000000. 30! = 30x29x28x27x26x25x24x23x22x21x20x19x18x17x16x15x14x13x12x11x10x9x8x7x6x5x4x3x2x1 A non-negative integer is defined by any whole number that is 0 or positive (not a fraction or decimal). What is Large Number? In context of calculating the factorial number, the large number denotes the n value ...
Read MoreWhat does \'is\' operator do in Python?
The "is" operator in Python is an identity operator. This operator checks whether two variables refer to the same object in memory. It returns boolean values as a result. Each object in the computer's memory is assigned a unique identification number (id) by the Python interpreter. Identity operators check if the id() of two objects is the same. The 'is' operator returns false if id() values are different and true if they are the same. Syntax of Python (is) Operator The "is" operator follows the following syntax in Python: variable1 is variable2 The "is" operator ...
Read MoreWhy can\'t a Java class be both abstract and final?
In Java, both abstract and final are class modifiers but they are completely opposite to each other. That's why Java class cannot be both abstract and final. Abstract class An abstract class in Java is a class that may contain both abstract methods (without implementation) and concrete methods (with implementation). If a class has even one abstract method, it must be declared abstract. You cannot create objects of an abstract class directly. If you want to use the concrete method in an abstract class you need to inherit the class, provide implementation to the abstract methods (if any) and ...
Read MoreHow to create python namespace packages in Python 3?
Namespace packages is a special package introduced in Python 3.3 that allows you to split package contents across multiple directories. If you didn't include at least an empty _init_.py file in your package, then your package becomes a namespace package. In Python, a namespace package allows you to spread Python code among several projects. This is useful when you want to release related libraries as separate downloads. Currently, there are three methods for developing namespace packages. These methods are mentioned below. Native namespace packages (PEP 420) pkgutil-style Namespace packages ...
Read MoreHow do I import all the submodules of a Python namespace package?
What are Namespace Packages? Namespace packages are a type of package in Python that allows you to split the sub-packages and modules within a single package across multiple, separate distribution packages. Unlike normal packages, the namespace packages don't require _init_.py file. Automatically importing all submodules within a namespace package serves several purposes, like auto-registration without manually importing, and to load all available plugins in a system. This article discusses the two methods that you can use to import all the sub-modules of a Python namespace package - Using pkgutil.iter_modules() Using ...
Read MoreHow to check if multiple strings exist in another string in Python?
While working with the strings, Checking if the string exists inside another string is a common task and can be achieved by using the in keyword. But, In this article we are going to see how to check if multiple strings exist in another string in Python. For example, checking the multiple strings: "TP", "WELCOME", exists in the string "WELCOME to TP". For achieving this, Python provides different methods including loops, any() and all(). Using Python any() Function The Python any() function returns true if any of the element of the given iterable (such as list, ...
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