public class RatNum {

	private int num;
	private int den;


	public RatNum() {
	this.num = 0; //numerator
	this.den = 1; //denominator
	}

	public RatNum(int a) {
		// a denotes the numerator
		this.num = a;
		this.den = 1;
	}

	public RatNum(int a, int b) {
		if (b==0) {
			throw new NumberFormatException("Denominator = 0");
		}
		this.num = a;
		this.den = b;
		if (gcd(a,b) == 1) {
			int RN = a/b;
		} else {
			int gcdN = (a)/(gcd(a,b)); // gcdN = greatest common divisor, Numerator
			int gcdD = (b)/(gcd(a,b)); // gcdN = greatest common divisor, Denominator
			int RN = (gcdN)/(gcdD);
		}
	}

	public RatNum(RatNum r) { // %%%%%%%%%%%%%%%%%%%% SEEEEEEEEEEEEEEEEE HÄRRRRRRRRRRRRRRRRRR %%%%%%%%%%%%%%
		this.num = r.num;
		this.den = r.den;

	}

	public int getNumerator() {
		return this.num;
	}

	public int getDenominator() {
		return this.den;
	}

	public static int gcd(int a,int b) {
		if (a == 0 || b == 0) {
			throw new IllegalArgumentException("Please, enter a non-zero integer.");
		}
		if(a < 1) {
			a = a * (-1);
		}
		if(b < 0) {
			b = b * (-1);
		}
		int r = a % b;
		if (r==0) {
			return b;
		} else {
			a=b;
			b=r;
			return gcd(a,b);
		}
	}

	public static void main(String[] args) {

		System.out.println(gcd(4,8));

	}


}