#include <iostream>
#include <cstdlib>  //for the function exit and the macro EXIT_FAILURE
#include "element.h"
using namespace std;

//Definitions for static data members:

const string element::name[] {
	"",	     //dummy, so that Hydrogen will have subscript 1
	"Hydrogen",  //  1
	"Helium",    //  2
	"Lithium",   //  3
	"Beryllium", //  4
	"Boron",     //  5
	"Carbon",    //  6
	"Nitrogen",  //  7
	"Oxygen",    //  8
	"Flourine",  //  9
	"Neon",      // 10
	"Sodium",    // 11
	"Magnesium", // 12
	"Aluminum",  // 13
	"Silicon",   // 14
	"Phosphorus",// 15
	"Sulfur",    // 16
	"Chlorine",  // 17
	"Argon",     // 18
	"Potassium", // 19
	"Calcium"    // 20
};

const size_t element::n {size(element::name) - 1};

const int element::biggestInEachPeriod[] {
	  0,   //dummy, so thet first period will have subscript 1
	  2,   //Period 1
	 10,   //Period 2
	 18,   //Period 3
	 36,   //Period 4
	 54,   //Period 5
	 86,   //Period 6
	118    //Period 7
};

element::element(int z)
	: atomicNumber {z}
{
	if (z < 1 || z > n) {
		cerr << "Bad atomic number " << z << ".\n";
		exit(EXIT_FAILURE);
	}
}

int element::period() const   //element's row in periodic table
{
	for (int p {1}; p < size(biggestInEachPeriod); ++p) {
		if (biggestInEachPeriod[p] >= atomicNumber) {
			return p;
		}
	}

	return 0;   //not found
}

void element::print() const
{
	cout << name[atomicNumber];
}