Answer 1

#include <iostream>
#include <string>
using namespace std;

int main() {
string *doc = new string;
cin >> *doc;
cout << *doc << endl;
delete doc;
return 0;
}

In the lesson examples, they use p as the variable name to stand for pointer. It is not a keyword so you can just make the pointer named doc like this:

string *doc = new string;

Also, cin doesn’t return a value. To get input from it and store that input in the pointer doc:

cin >> *doc;

No = is needed.

Finally, you should use

delete doc;

to delete the memory location that doc is pointing to. It’s not important if the program is about to exit, but if you use a lot of pointers and never delete when you are done with them, they will build up and slow the program down a lot.

Answer 2

may I ask why are you declaring a pointer in middle of a variable name ?