Input and Output with cin/cout

C++ uses cin for input and cout for output. They are part of the iostream library.

#include <iostream>
using namespace std;

int main() {
  int age;
  cout << "Enter your age: ";
  cin >> age;
  cout << "You are " << age << " years old.";
  return 0;
}

cout uses the insertion operator <<, and cin uses the extraction operator >>.