do you need cin << in c++ code example

Example 1: how to grab all of user input c++

// cin with strings
#include <iostream>
#include <string>
using namespace std;

int main ()
{
  string mystr;
  cout << "What's your name? ";
  getline (cin, mystr);
  cout << "Hello " << mystr << ".\n";
  cout << "What is your favorite team? ";
  getline (cin, mystr);
  cout << "I like " << mystr << " too!\n";
  return 0;
}

Example 2: c++ output

#include <iostream>

int main(){
  std::cout << "Hello World!" << std::endl; // prints "Hello World"
}