#include <RPN.hpp>
#include <cstdlib>
#include <iostream>

int main(int argc, char* argv[]) {
	if (argc != 2) {
		std::cerr << "Usage: " << argv[0] << " <expression>" << std::endl;
		return 1;
	}

	try {
		const RPN rpn;

		std::cout << rpn.evaluate(argv[1]) << std::endl;
	} catch (const std::exception& exception) {
		std::cerr << "Error" << std::endl;
		std::cerr << exception.what() << std::endl;
		return EXIT_FAILURE;
	}
}