Labki 5

package lab5;

class Rational {
    ///////////////////////////////utilities/////////////////////////////
    int NWD(int a, int b)
    { if(a==0)
    {
        return 1;
    }
       int  c = a;
        int d = b;
        while (c != d)
        {
            if (c>d)
            {
                c -= d;
            }
            else
            {
                d -= c;
            }

        }
        return c;
    }

   ////////////////////////////////////fields////////////////////////////////

    private int l = 0, m = 0, c = 0;
    ////////////////////////constructors//////////////////////////////////////

    Rational (int a, int b)
    {
        l = a;
        m = b;

    }
    Rational ( int a)
    {
      this (a,1);
    }
    ////////////////////////methods/////////////////////////

    Rational short_rat()
    { if (l ==0)
    {
        return this;
    }
        int nwd = NWD(l, m);
        l = l/nwd;
        m = m/nwd;
        c = l/m;
        if (c != 0)
        {
            l = l-c*m;
        }

       return this;

    }

    Rational addition (Rational b)
    {
        return new Rational (l*b.m + m*b.l, m*b.m );

    }

    Rational substraction (Rational b)
    {
        return new Rational (l*b.m - m*b.l, m*b.m );
    }

    Rational multipli (Rational b)
    {
         return new Rational (l*b.l, m*b.m );
    }

    Rational reverse()
    {
         return new Rational (m,l);
    }
    Rational divide (Rational b)
    {
        return new Rational (l*b.m, m*b.l);
    }


    public String toString()
    {
        short_rat();
        if (c == 0 && l != 0)
        {
           return l+"/"+m;
        }
        else if (l == 0 && c == 0 )
        {
            return Integer.toString(0);
        }
        else if (c != 0 && l == 0)
        {
            return Integer.toString(c);
        }


        else
        {
            return c+" "+l+"/"+m;
        }
    }
}



public class Lab5 {




    public static void main(String[] args) {


       Rational x = new Rational(1,2);
       Rational y = new Rational(3,4);
       Rational z = new Rational(3,4);
       Rational a = new Rational(5,6);
       System.out.println(x.addition(y).divide(z.substraction(a)).short_rat());



}
}