#include <iostream>  //for cerr and <<
#include <cstdlib>   //for EXIT_FAILURE
#include <cmath>     //for abs
#include "relativistic_rocket.h"
using namespace std;

relativistic_rocket::relativistic_rocket(double initial_length, double initial_v)
	: rocket(initial_length, initial_v)
{
	if (abs(v()) >= c()) {
		cerr << "Velocity " << v() << " can't be >= the speed of light "
			<< c() << ".\n";
		exit(EXIT_FAILURE);
	}
}