1.2.2

#include <iostream>
 
int main()
{
  std::cout << "Hello, World!" << std::endl;
  return 0;
}

#include <iostream>
 
int main()
{
  std::cout << "Enter two numbers:" << std::endl;
 
  int v1, v2;
 
  std::cin >> v1 >> v2;
 
  std::cout << "The product of " << v1 << " and "
            << v2 << " is " << v1 * v2 << "." << std::endl;
  return 0;
}

#include <iostream>
 
int main()
{
  std::cout << "Enter two numbers:";
  std::cout << std::endl;
 
  int v1, v2;
 
  std::cin >> v1;
  std::cin >> v2;
 
  std::cout << "The sum of ";
  std::cout << v1;
  std::cout << " and ";
  std::cout << v2;
  std::cout << " is ";
  std::cout << v1 + v2;
  std::cout << ".";
  std::cout << std::endl;
 
  return 0;
}