create a table using pointers in C++

To create a table using pointers in C++, you can follow these steps:

Step 1: Declare the variables - Declare a pointer variable to store the memory address of the table. - Declare two variables to represent the size of the table: rows and columns. - Declare a variable to store the total number of elements in the table.

Step 2: Input the size of the table - Ask the user to input the number of rows and columns for the table. - Store the user input in the corresponding variables.

Step 3: Allocate memory for the table - Calculate the total number of elements by multiplying the number of rows and columns. - Use the "new" operator to dynamically allocate memory for the table. - Assign the address of the allocated memory to the pointer variable.

Step 4: Initialize the table - Use nested loops to traverse through each element of the table. - Ask the user to input the value for each element. - Store the user input in the corresponding memory location using pointer arithmetic.

Step 5: Access and display the table - Use nested loops to traverse through each element of the table. - Access the value of each element using pointer arithmetic. - Display the value of each element.

Step 6: Deallocate memory - Use the "delete" operator to deallocate the memory allocated for the table. - Set the pointer variable to nullptr to avoid accessing invalid memory.

Here is an example of the code:

#include <iostream>

int main() {
    int rows, columns;
    int* table;
    int totalElements;

    // Input the size of the table
    std::cout << "Enter the number of rows: ";
    std::cin >> rows;
    std::cout << "Enter the number of columns: ";
    std::cin >> columns;

    // Allocate memory for the table
    totalElements = rows * columns;
    table = new int[totalElements];

    // Initialize the table
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < columns; j++) {
            std::cout << "Enter the value for element at row " << i + 1
                      << " and column " << j + 1 << ": ";
            std::cin >> (table + i  columns + j);
        }
    }

    // Access and display the table
    std::cout << "Table:" << std::endl;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < columns; j++) {
            std::cout << (table + i  columns + j) << " ";
        }
        std::cout << std::endl;
    }

    // Deallocate memory
    delete[] table;
    table = nullptr;

    return 0;
}

This code allows the user to create a table of any size, input values for each element, and display the table. The memory for the table is allocated dynamically using pointers, and it is deallocated at the end to prevent memory leaks.