Declare 2D Array in C++ Using New

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.

Algorithm

Begin    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. End

Example Code

 Live Demo

#include <iostream> 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];    for(int i = 0; i < B; ++i)       for(int j = 0; j < A; ++j)          a[i][j] = i;    for(int i = 0; i < B; ++i)       for(int j = 0; j < A; ++j)          cout << a[i][j] << "\n";    for(int i = 0; i < A; ++i)       delete [] a[i];       delete [] a; return 0; }

Output

0 0 0 0 0 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3