7. Ratio

import java.util.*;
import java.lang.*;
class ratio
{
    int num,den;
    ratio()
    {}
    ratio(int i,int j)
    {
        num = i;
        den = j;
    }
    void addRatio(ratio a,ratio b)
    {
        if(a.den == b.den)
        {
            den = a.den;
            num = (a.num) + (b.num);
        }
        else
        {
            num = (a.num*b.den)+(a.den*b.num);
            den = (a.den)*(b.den);
        }
    }
    void display()
    {
        int x = num;
        int y = den;
        System.out.println("ratio is "+x+"/"+y);
    }
    void subRatio(ratio a,ratio b)
    {
        if(a.den == b.den)
        {
            den = a.den;
            num = (a.num) - (b.num);
        }
        else
        {
            num = (a.num*b.den)-(a.den*b.num);
            den = (a.den)*(b.den);
        }
    }
    void multiplyRatio(ratio a,ratio b)
    {
        num = (a.num)*(b.num);
        den = (a.den)*(b.den);
    }
    void divideRatio(ratio a,ratio b)
    {
        num = (a.num)*(b.den);
        den = (a.den)*(b.num);
    }
    static void compareRatio(ratio a,ratio b)
    {
        long r1=0,r2=0;
        r1 = (a.num)/(a.den);
        r2 = (b.num)/(b.den);
        if(r1>=r2)
        {
            if(r1==r2)
            {
                System.out.println("ratio's are equal");
            }
            else
            {
                System.out.println("ratio 1 is greater than ratio 2");
            }
        }
        else
            System.out.println("ratio 2 is greater than ratio 1");
    }
    static void reciprocal(ratio a)
    {
        int temp;
        temp = a.num;
        a.num = a.den;
        a.den = temp;
    }

    public static void main(String args[])
    {
        Scanner t = new Scanner(System.in);
        System.out.println("enter num and den of 1st ratio");
        int i = t.nextInt();
        int j = t.nextInt();
        ratio a = new ratio(i,j);
        System.out.println("enter num and den of 2nd ratio");
        i = t.nextInt();
        j = t.nextInt();
        ratio b = new ratio(i,j);
        ratio c = new ratio();
        c.addRatio(a,b);
        System.out.println(" addition of  two ratio is :");
        c.display();
        c.subRatio(a,b);
        System.out.println(" subtraction of two ratio is :");
        c.display();
        c.multiplyRatio(a,b);
        System.out.println(" multiplication of two ratio is :");
        c.display();
        c.divideRatio(a,b);
        System.out.println(" division of ratio two is :");
        c.display();
        compareRatio(a,b);
        reciprocal(a);
        reciprocal(b);
        reciprocal(c);
        System.out.println(" reciprocal of 1st ratio is  :");
        a.display();
        System.out.println(" reciprocal of 2nd ratio is  :");
        b.display();
        System.out.println(" reciprocal of 3rd ratio is  :");
        c.display();
    }
}