Chapter 1 Learncpp

#include <iostream>

using namespace std;

int main()
{
   cout << "Hello World" << endl; 
   
   return 0;
}
#include <iostream>
 
// best version
int main()
{
	std::cout << "Enter an integer: ";
 
	int num{ 0 };
	std::cin >> num;
 
	std::cout << "Double that number is: " <<  num * 2 << '\n'; // use an expression to multiply num * 2 at the point where we are going to print it
 
	return 0;
}