Server Side Programming Articles - Page 2299 of 2651

In this section we will see what is the placement new operator in C++. This placement new is another variation of new operator. The normal new operator performs two things. It allocates memory, and then constructs an object in allocated memory.The new operator allocates memory in the heap section and constructs objects there. But for the placement new operator, it constructs object at the given address. To deallocate memory, we can use delete keyword if the memory is allocated using new operator. But for placement new there is no placement delete feature.So in a nutshell, placement new allows you to ... Read More

In C++, we allocate the memory dynamically using the new operator. But there is a special version of this operator known as placement new operator. The new operator performs two things. It allocates memory, and then constructs an object in allocated memory. But for the placement new operator, it constructs object at the given address. What is Placement New? The placement new operator allows you to construct an object at a specific memory location. Its syntax lets you place an object at a pre-allocated memory address instead of letting the compiler allocate memory. new (address) Type (constructor_args); Where ... Read More

What is Conversion Operator Conversion operators are a type of operator overloading in C++. These operators are commonly known as type-cast operators. They enable a class or structure to specify how an object should be converted into another data type. Sometimes we need to convert concrete-type objects to some other type of objects or primitive data types. To make this conversion we can use a conversion operator. Following is the syntax to use the conversion: class ClassName { public: operator TargetType() const { // conversion logic } }; ... Read More

In this article we will see how to add two numbers without using arithmetic operators like +, ++, -, or --.To solve this problem, we can solve them using binary adder logic. In that case we were designed half adder and full adder. These adders can add one bit binary numbers. By cascading multiple adders, we have can create circuit to add bigger numbers.In that adder, we have performed XOR operation among the numbers, then for the carry we were performing the ANDing logic. These features are implemented here to add two numbers.Example Code Live Demo#include using namespace std; int ... Read More

A hash table is a data structure which is used to store key-value pairs. Hash function is used by hash table to compute an index into an array in which an element will be inserted or searched.Linear probing is a collision resolving technique in Open Addressed Hash tables. In this method, each cell of a hash table stores a single key–value pair. If a collision is occurred by mapping a new key to a cell of the hash table that is already occupied by another key. This method searches the table for the following closest free location and inserts the ... Read More

Rolling hash is a hash function in which the input is hashed in a window that moves through the input.Rabin-Karp is popular application of rolling hash. The rolling hash function proposed by Rabin and Karp calculates an integer value. For a string the integer value is numeric value of a string.The Rabin–Karp string search algorithm is often explained using a very simple rolling hash function that only uses multiplications and additions −H=c1ak-1+c2ak-2+….+ cka0.Where, a is a constant, and c1, c2….ck are the input characters. In order to manipulate Huge value of H, mod n is done.AlgorithmBegin    Declare a constant ... Read More

A hash table is a data structure which is used to store key-value pairs. Hash function is used by hash table to compute an index into an array in which an element will be inserted or searched.Double hashing is a collision resolving technique in Open Addressed Hash tables. Double hashing uses the idea of using a second hash function to key when a collision occurs.This is a C++ program to Implement Hash Tables chaining with double hashing.AlgorithmFor search a key:Begin    Declare Function SearchKey(int k, HashTable *ht)       int hashVal= HashFunc1(k, ht->s)       int stepSize= HashFunc2(k, ... Read More

A hash table is a data structure which is used to store key-value pairs. Hash function is used by hash table to compute an index into an array in which an element will be inserted or searched.This is a C++ program to Implement Hash Tables chaining with singly linked lists.AlgorithmFor insert:Begin    Declare Function Insert(int k, int v)       int hash_v = HashFunc(k)       HashTableEntry* p = NULL       HashTableEntry* en = ht[hash_v]       while (en!= NULL)          p = en          en= en->n     ... Read More

A hash table is a data structure which is used to store key-value pairs. Hash function is used by hash table to compute an index into an array in which an element will be inserted or searched.This is a C++ Program to Implement Hash Tables Chaining with List Heads.AlgorithmFor insert:Begin    Declare function Insert(int k, int v)       int hash_v = HashFunc(k)       if (ht[hash_v] == NULL)          ht[hash_v] = new ListHead(k, v)       else          ListHead *en = ht[hash_v]          while (en->n != NULL) ... Read More

In this article, we will see what is the conversion operator in C++. C++ supports object-oriented design. So we can create classes of some real-world objects as concrete types.Sometimes we need to convert some concrete type objects to some other type objects or some primitive datatypes. To make this conversion we can use conversion operator. This is created like operator overloading function in class.In this example, we are taking a class for complex numbers. It has two arguments real and imaginary. When we assign the object of this class into some double type data, it will convert into its magnitude ... Read More