Let us consider this following program, Live Demo#include using namespace std; int* Array() {    int a[100];    a[0] = 7;    a[1] = 6;    a[2] = 4;    a[3] = 3;    return a; } int main() { int* p = Array(); cout

C++ does not support variable length arrays. The C++11 standard mentions array size as a constant-expression.So if we write a program in C++ like:void displayArray(int n) { int arr[n]; // ...... } int main() { displayArray(7); } It will not work.

New operator is used for dynamic memory allocation which puts variables on heap memory. Delete[] operator is used to deallocate that memory from heap. New operator stores the no of elements which it created in main block so that delete [] can deallocate that memory by using that number.Example Code Live Demo#include using namespace std; int main() { int B = 4; int A = 5; int** a = new int*[B]; for(int i = 0; i < B; ++i) a[i] = new ... Read More

Arrays can be passed to a function as an argument. In this program, we will perform to display the elements of the 2 dimensional array by passing it to a function.AlgorithmBegin The 2D array n[][] passed to the function show(). Call function show() function, the array n (n) is traversed using a nested for loop. EndExample Code Live Demo#include using namespace std; void show(int n[4][3]); int main() {    int n[4][3] = {       {3, 4 ,2},       {9, 5 ,1},       {7, 6, 2},       {4, 8, 1}};    show(n);    return 0; } void show(int n[][3]) { cout

A dynamic 2D array is basically an array of pointers to arrays. Here is a diagram of a 2D array with dimenation 3 x 4.AlgorithmBegin    Declare dimension of the array.    Dynamic allocate 2D array a[][] using new.    Fill the array with the elements.    Print the array.    Clear the memory by deleting it. EndExample Code Live Demo#include using namespace std; int main() {    int B = 4;    int A = 5;    int** a = new int*[B];    for(int i = 0; i < B; ++i)       a[i] = new int[A];   ... Read More

In C++, it is faster to process a sorted array than an unsorted array because of branch prediction. In computer architecture, a branch prediction determines whether a conditional branch (jump) in the instruction flow of a program is likely to be taken or not.Let’s take an example:if(arr[i] > 50) { Do some operation B } else { Do some operation A }If we run this code for 100 elements in unsorted and sorted order below things will be happened:For sorted array:1, 2, 3, 4, 5, ……50, 51………100 A, A, A, A, A A, B ... Read More

This is a C++ program to implement Bit Array. A Bit Array is an array data structures that compactly stores data. It is basically used to implement a simple data structure.AlgorithmFunctions and pseudocodes:Begin    Function getBit(int val, int pos)    singleBit->b = 0    if(pos == 0)       singleBit->b = val & 1    else       singleBit->b = ( val & (1 > pos       return singleBit    Function setBit(BitArr *bt, B *bit, int pos)       bt->bVal[pos] = bit       return bt    Function getVal(BitArr *bArray)    initialize val = ... Read More

In this C++ program we implement Graph Structured Stack.AlgorithmBegin    Function graphStructuredStack(int **adjMat, int s, int bNode):    Take an array adjMat, source s and bottom node bNode    initialize stackFound = false    for sVertex = 1 to noOfNodes       for dVertex = 1 to noOfNodes          this->adjMat[sVertex][dVertex] = adjMat[sVertex][dVertex]       Done    Done    Push source into mystack.    while (!mystack.empty())       element = mystack.top()       Initialize destination, d=1       while (d adjMat[element][d] == 1)             Push destination into mystack ... Read More

A directed acyclic graph (DAG) is a graph that is directed and without cycles connecting the other edges. The edges of this graph go one way. This is a C++ program to check whether the graph is DAG.AlgorithmBegin Function checkDAG(int n):    intialize count = 0    intialize size = n - 1    for i = 0 to n-1       if (count == size)          return 1       done       if (arr[i].ptr == NULL)          increment count          for j = 0 to n-1 ... Read More

The day of the year for a particular LocalDateTime can be obtained using the getDayOfYear() method in the LocalDateTime class in Java. This method requires no parameters and it returns the day of the year which can be in the range of 1 to 365 and also 366 for leap years.A program that demonstrates this is given as follows −Example Live Demoimport java.time.*; public class Demo {    public static void main(String[] args) {       LocalDateTime ldt = LocalDateTime.parse("2019-02-18T11:30:15");       System.out.println("The LocalDateTime is: " + ldt);       System.out.println("The day of the year is: " + ... Read More