Examples of dynamic multidimensional arrays source code

This snippet submitted by Ali Nawkhas Murad on 2012-01-15. It has been viewed 29119 times.
Rating of 6.0 with 190 votes

//creation of dynamic multidimensional arrays?
#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
	//For creating one dimension array of 4 integers
	int *ptr1;
	ptr1 = new int[4];
	for( int i = 0 ; i < 4 ; i++)
	{
		ptr1[i] = i+1;
	}

	cout << "\nOne dimension array of 4 integers:\n";
	for( int i = 0 ; i < 4 ; i++)
	{
		cout << "  " << ptr1[i] ;
	}

	cout << endl << endl;

	//for creating two dimensional array of 3 by 4 integers
	int **ptr2;
	ptr2 = new int*[3];
	for( int i = 0 ; i < 3 ; i++)
	{
		ptr2[i] = new int[4];
	}

	for( int i = 0 ; i < 3 ; i++)
	{
		for ( int j = 0 ; j < 4 ; j++)
		{
			ptr2[i][j] = i * 4 + j;
		}
	}

	cout << "\nTwo dimensions array of 3 by 4 integers:\n";
	for( int i = 0 ; i < 3 ; i++)
	{
		for ( int j = 0 ; j < 4 ; j++)
		{
			cout << setw(4) << right << ptr2[i][j] << " ";
		}
		cout << endl;
	}

	//for creating three dimensional array of 2 by 3 by 4 double float
	double ***ptr3;
	ptr3 = new double**[2];
	for( int i = 0 ; i < 2 ; i++)
	{
		ptr3[i] = new  double*[3];
	}
	for( int i = 0 ; i < 2 ; i++)
	{
		for( int j = 0 ; j < 3 ; j++)
		{
			ptr3[i][j] = new  double[4];
		}
	}

	for( int i = 0 ; i < 2 ; i++)
	{
		for( int j = 0 ; j < 3 ; j++)
		{
			for( int k = 0 ; k < 4 ; k++)
			{
				ptr3[i][j][k] = ( i * 3 + j ) * 4.1 + k * 0.1;
			}
		}
	}
	cout << "\nThree dimensions array of 2 by 3 by 4 double float :\n";
	for( int i = 0 ; i < 2 ; i++)
	{
		for( int j = 0 ; j < 3 ; j++)
		{	
			for( int k = 0 ; k < 4 ; k++)
			{
				cout <<"\nptr3(" << i << "," << j << "," << k << ") = " << setprecision(4) <<
				{
					ptr3[i][j][k];
				}
			}
		}
	}

	return 0;
}

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