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Articles on Trending Technologies
Technical articles with clear explanations and examples
Does C++ support Variable Length Arrays
No, C++ does not support Variable Length Arrays (VLAs). A Variable length array is an array whose size is determined at runtime, not at compile time. These types of arrays are only supported in C99 version of C language. In this article, we will discuss the reasons why C++ does not support VLAs and what alternatives are available for variable array allocation. What is Variable Length Array (VLA)? A Variable Length Array (VLA) is an array whose size can be determined at runtime. It is not supported in standard C++. But, in C99 you can declare a VLA like ...
Read MoreConverting string to number and vice-versa in C++
In this article, we will see how to convert a string to a number and a number to string using modern C++ techniques. Understanding Strings and Numbers In C++, strings and numbers are two different data types. A string is a sequence of characters enclosed in double quotes, and a number can be any numerical value such as integer, float, double, etc. Strings are used to represent text data and numbers are used for mathematical calculations. Let's see an example of defining a string and number. // Define a string string str = "Hello World"; // Define ...
Read MoreHow does delete[] “know” the size of the operand array in C++
The delete[] operator is used to deallocate that memory from heap that was allocated using the new[] operator. In this article, we will explore, what is delete[] operator in C++, how it works, and how it knows the size of the operand array to deallocate the correct amount of memory. The delete[] Operator The delete[] operator is a C++ operator that is used to free memory that was previously allocated for an array using the new[] operator. It is always important to deallocate memory that has been allocated with new[] to avoid memory leaks in your program. If you ...
Read MoreHow do I create a random alpha-numeric string using C++?
Alpha-numeric string are the strings that containing both alphabets and numbers mixed together. These are generally used in security system for generating passwords or hash keys. In this article, we will learn all the approaches for developing a C++ program to generate random alpha numeric stiring. First of all, let's understand the problem statement, We have to input a positive integer for the length of string. The program should output a string of the size containing random characters and numbers. For example, // Input Number : Length of alpha-numeric string 5 // Output String : Alpha-numeric string fd23j ...
Read MoreWhat is the size of a pointer in C/C++?
The size of a pointer in C/C++ is not fixed. It depends upon different issues like Operating system, CPU architecture etc. Usually it depends upon the word size of underlying processor, for example for a 32 bit computer the pointer size can be 4 bytes and for a 64 bit computer the pointer size can be 8 bytes. So for a specific architecture pointer size will be fixed. It is common to all data types like int *, float * etc. Depending on the system architecture, pointer size may vary. The following table shows the pointer size based on the ...
Read MoreC++ Program to Implement Fusion Tree
A fusion tree is a tree data structure that implements an associative array on w-bit integers. Here, W is the number of bits in the integer. A fusion tree is used to maintain the ordered set of elements. It uses a combination of a B-tree and a hash table that helps reduce the time complexity of the operations like insertion, deletion, and searching in the tree. How Fusion Tree Works? The following are the factors that should be considered while implementing the fusion tree: Bit manipulation: The tree extracts specific bits from stored integers and ...
Read MoreHow to create a thread by using anonymous class in Java?
This article will use an anonymous class to create a Thread in Java. An Anonymous class is a class that does not have a name. Thread in Java In Java, a Thread is a part of a program that can be executed independently. All Java programs have at least one thread, known as the main thread, which is created by the Java Virtual Machine (JVM), when the main() method is invoked. Creating a Thread by Using Anonymous Class In Java, the basic way to create a thread is to either extend the Thread class or implement the Runnable interface. However, we ...
Read MoreWhat is the use of Object Cloning in Java?
The article will explain the use of object cloning in Java and provide an appropriate example to clarify the problem. What is the Object Cloning in Java? In Java, object cloning is a way to create an exact copy of an object. We can use the clone() method provided by the Object class to create a clone of an object. When an object is cloned, a new instance of the same class is created, and the fields of the original object are copied to the new object. The Cloneable interface must be implemented by a class whose object is ...
Read MoreHow many ways to call garbage collector (GC) in Java?
This article explains the different ways of calling the garbage collector (GC) in Java. It also includes a brief introduction to garbage collection, various calling approaches, and relevant examples. Garbage Collection (GC) in Java In Java, the garbage collection is carried out by a daemon thread called the Garbage Collector (GC). Instead of waiting until the Java Virtual Machine (JVM) runs a garbage collector, we can request the JVM to run the garbage collector. There is no guarantee that the JVM will accept our request. In Java, we can call the garbage collector (GC) manually in "two ways", which ...
Read MoreHow to convert between List and Array in Java?
In Java, a List is an interface that represents an ordered collection of elements of the same type. You cannot directly create an object of the List interface, instead, you need to instantiate an ArrayList class or another class that implements the List interface.An array is a container that holds a fixed size of similar types of data. As the size is fixed, it can not be changed once created.The conversion between List and array is important because array provides faster access to the elements than List interface (faster in case of searching elements), and provides a fixed size of ...
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