Please in C++

Problem : (Swap Function)

Write a function with the following prototype:

void swap(int& x, int& y);

that takes two integers that are passed by reference and swaps their contents. For example, if a == 1 and b == 2, and we execute swap(a,b), then it should be the case that a == 2 and b == 1.

Write a complete program that asks the user to input two integers into two variables, calls the swap function, and then displays the contents of the swapped variables.