double array size c++

To double the size of a C++ array, you need to follow these steps:

Declare a new array with double the size of the original array. You can use the new operator to dynamically allocate memory for the new array. For example, if the original array is named originalArray and has n elements, you can declare a new array as follows:

cpp double newArray = new double[2 n];

This allocates memory for an array of 2 * n elements of type double.

Copy the elements from the original array to the new array. You can use a loop to iterate over the elements of the original array and copy them one by one to the new array. For example:

cpp for (int i = 0; i < n; i++) { newArray[i] = originalArray[i]; }

This loop copies each element of the original array to the corresponding position in the new array.

Release the memory occupied by the original array. Since you have created a new array, you should deallocate the memory occupied by the original array to avoid memory leaks. You can use the delete[] operator to free the memory. For example:

cpp delete[] originalArray;

Update any references to the original array to point to the new array. If there are any variables or pointers that hold a reference to the original array, you need to update them to point to the new array. For example, if you have a pointer named arrayPtr that points to the original array, you can update it as follows:

cpp arrayPtr = newArray;

Now arrayPtr will point to the new array.

Optionally, update the value of the variable n to reflect the new size of the array. If you have a variable n that stores the size of the original array, you may want to update its value to reflect the new size of the array. For example:

cpp n = 2 * n;

Now n will hold the new size of the array.

Remember to free the memory allocated for the new array when you no longer need it to avoid memory leaks:

delete[] newArray;

That's it! By following these steps, you can double the size of a C++ array.