In C++, we use the cin and cout objects for standard input and output. These objects belong to the iostream library. The cout object, along with the << operator, is used to output data, like print in Python or JavaScript's console.log, while cin, together with >>, is used to take input from the user, akin to JavaScript's prompt or Python's input.

In the given C++ code, we first include iostream to be able to use cin and cout. Then we define variables userName and userAge to store the user's input. We ask for the user's name and age using cout, and take the user's input using cin. At the end, we greet the user and tell them their age using cout.

Comparable to string interpolation in your JavaScript or Python code, the << operator allows us to include variable values in strings output by cout.

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#include <iostream>

using namespace std;

int main() {

  string userName;

  int userAge;

  cout << "Please enter your name: ";

  cin >> userName;

  cout << "Enter your age: ";

  cin >> userAge;

  cout << "Hello, " << userName << ". You are " << userAge << " years old." << endl;

  return 0;

}