#include <iostream>
#include <stdexcept>

/* Expected output:

hello5.3
helloworld
Unknown operator
6.5

 */
int main()
{
    Variable var1 { "hello" };
    Variable var2 { 5.3 };
    Variable var3 { "world" };
    Variable var4 { 1.2 };
    
    std::cout << var1 + var2 << std::endl;
    std::cout << var1 + var3 << std::endl;

    try
    {
	std::cout << var2 + var3 << std::endl;
    } catch (std::exception& e)
    {
	std::cerr << e.what() << std::endl;
    }
    
    std::cout << var2 + var4 << std::endl;
    
}