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4-Dimensional Array in C++

A 4-dimensional array in C++ is an array that has four dimensions. It is essentially an array of arrays of arrays of arrays. You can declare and use a 4D array as follows:

C++
#include <iostream>

int main() {
    // Define the dimensions of the 4D array
    int dim1 = 2;
    int dim2 = 3;
    int dim3 = 4;
    int dim4 = 5;

    // Declare and initialize a 4D array
    int arr4D[dim1][dim2][dim3][dim4];

    // Initialize elements in the 4D array
    for (int i = 0; i < dim1; ++i) {
        for (int j = 0; j < dim2; ++j) {
            for (int k = 0; k < dim3; ++k) {
                for (int l = 0; l < dim4; ++l) {
                    arr4D[i][j][k][l] = i * 1000 + j * 100 + k * 10 + l;
                }
            }
        }
    }

    // Access and print elements in the 4D array
    for (int i = 0; i < dim1; ++i) {
        for (int j = 0; j < dim2; ++j) {
            for (int k = 0; k < dim3; ++k) {
                for (int l = 0; l < dim4; ++l) {
                    std::cout << "arr4D[" << i << "][" << j << "][" << k << "][" << l << "] = "
                              << arr4D[i][j][k][l] << std::endl;
                }
            }
        }
    }

    return 0;
}

In this example:

  • We define the dimensions of the 4D array using dim1, dim2, dim3, and dim4.
  • We declare and initialize a 4D array arr4D with the specified dimensions.
  • We initialize the elements in the 4D array using nested loops.
  • We access and print the elements in the 4D array using nested loops.

Keep in mind that working with multi-dimensional arrays can become complex, especially as the number of dimensions increases. In practice, it is often more convenient to use alternative data structures like nested std::vector containers or consider whether a higher-dimensional array is truly necessary or if a different data structure might better suit your needs.

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