how to make a user input in c 2b 2b

1#include <iostream>
2int main(){
3  std::string firstname; //variable created as a string
4  std::cout << "What's your first name\n";
5  std::cin >> firstname;//asking for the users' first name
6  std:: cout << "Hello " << firstname
7}
8//Works for anyone, don't need any packages, just type this is in and run it.

1#include <iostream>
2using namespace std;
3
4int main() {
5  int x, y;
6  int sum;
7  cout << "Type a number: ";
8  cin >> x;
9  cout << "Type another number: ";
10  cin >> y;
11  sum = x + y;
12  cout << "Sum is: " << sum;
13  return 0;
14}
15