Problem: Write a program that swaps the values of two variables using pointers.

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#include <iostream> void swap(int* a, int* b) {    int temp = *a;    *a = *b;    *b = temp; } int main() {    int x = 10;    int y = 20;    std::cout << "Before swap: " << "x = " << x << ", y = " << y << std::endl;    swap(&x, &y);    std::cout << "After swap: " << "x = " << x << ", y = " << y << std::endl;    return 0; }

In this example, we define a function called swap that takes two integer pointers (a and b) as parameters. Inside the function, we use temporary storage to swap the values of a and b by dereferencing the pointers.

In the main function, we declare two integer variables (x and y) and initialize them with values. We then call the swap function, passing the addresses of x and y using the address-of operator &. This allows us to pass the variables by reference, enabling the function to modify their values.

Finally, we print the values of x and y before and after the swap to verify that the swap operation was successful.

You can modify and expand this code to practice working with different types of pointers and perform various operations involving pointers.