Question

JAVA

Rational Numbers

Create a Rational number class in the same style as the Complex number class created in class. That is, implement the following methods:

• constructor
• add
• sub
• mul
• div
• toString

You must also provide a Main class and main method to fully test your Rational number class.

Answer 1

class Rational
{
private int num;
private int den;
  
//default constructor
Rational()
{
num = 0;
den = 1;   
}
  
//parameterize constructor
Rational(int n, int d)
{
num = n;
den = d;   
}
  
//method to add two rational number
public Rational add(Rational r)
{
Rational t = new Rational();
t.num = num * r.den + den * r.num;
t.den = den * r.den;
return t;
}
  
//method to subtract two rational number
public Rational sub(Rational r)
{
Rational t = new Rational();
t.num = num * r.den - den * r.num;
t.den = den * r.den;
return t;
}
  
//method to multiply two rational number
public Rational mul(Rational r)
{
Rational t = new Rational();
t.num = num * r.num;
t.den = den * r.den;
return t;
}
  
//method to divide two rational number
public Rational div(Rational r)
{
Rational t = new Rational();
t.num = num * r.den;
t.den = den * r.num;
return t;
}
  
//method to print the rational number
public String toString()
{
return num + "/" + den;
}
}

public class Main
{
   public static void main(String[] args)
   {
   //create object
       Rational r1 = new Rational(3, 5);
       Rational r2 = new Rational(2, 7);
       Rational r3 = new Rational();

//method calling and display result
       r3 = r1.add(r2);
       System.out.println(r1.toString()+" + "+r2.toString()+" = "+r3.toString());
       r3 = r1.sub(r2);
       System.out.println(r1.toString()+" - "+r2.toString()+" = "+r3.toString());
       r3 = r1.mul(r2);
       System.out.println(r1.toString()+" * "+r2.toString()+" = "+r3.toString());
       r3 = r1.div(r2);
       System.out.println(r1.toString()+" / "+r2.toString()+" = "+r3.toString());
   }
}

OUTPUT:

3/5 + 2/7 = 31/35
3/5 - 2/7 = 11/35
3/5 * 2/7 = 6/35
3/5 / 2/7 = 21/10