Using the following C$++$ code down below:

So it takes a second parameter called change. And then we're going to replace the is digit to check to see if what p is pointing at is equal to change. If it is$,$ then turn it into the x$.$ The second thing I want you to do is I want you to count how many times you've made this change. So instead of returning zero, you return how many times you've changed out the string, whatever this character is in the string, and replaced it with an x$.$