Kesr

// This class contains atributes (suret and mexrec) of Kesr.
// It will help to reference to suret and mexrec separately

public class Kesr {
    int suret;
    int mexrec;

    public Kesr(int suret, int mexrec) {
        this.suret = suret;
        this.mexrec = mexrec;
    }

    // This factory method (checkForZero) is for making sure
    // if the suret of Kesr is equal to zero not to create Kesr object
    public static Kesr checkAndCreate(int suret, int mexrec) {
        if (mexrec == 0)
            return null;
        else
            return new Kesr(suret, mexrec);
    }

    public void kesrLook() {

        System.out.println(this.suret + "/" + this.mexrec);
    }

    public Kesr kesrBol(Kesr kesr2) {

        return new Kesr(this.suret * kesr2.suret, this.mexrec * kesr2.mexrec);
    }

    public Kesr kesrVur(Kesr kesr2) {

        return new Kesr(this.suret * kesr2.mexrec, this.mexrec * kesr2.suret);
    }

    public Kesr kesrCem(Kesr kesr2) {

        int ortaq = lcd(this.mexrec, kesr2.mexrec);

        return new Kesr(this.suret * (ortaq / this.mexrec) + kesr2.suret * (ortaq / kesr2.mexrec) , ortaq );
    }


    // gcd is Great Common divisor (en boyuk ortaq bolen)
    public int gcd(int a, int b) {
        if (b == 0) return a;
        int r = a % b;
        return gcd(b, r);
    }


    // lcd is Least Common Divisor (en kicik ortaq bolunen)
    public int lcd(int a, int b) {
        return a * b / gcd(a, b);
    }

    public double valueOfKesr() {
        return  this.suret / this.mexrec;
    }
}