Question

I have provided a main method. Please add your fraction class. You need constructors, add, subtract, multiply, and divide methods, and a toString method. Your toString method needs to return the numerator followed by / followed by the denominator - NO spaces. DO NOT make any attempt to reduce the fractions (we shall do that later).

Please add comments throughout.

import java.util.Scanner;

public class H4 {

public static class Fraction
{



}
public static void main(String[] args) {
Fraction f= new Fraction();
//test default constructor
System.out.println(f);
//test mutators
f.setNumerator(4);
f.setDenominator(5);
//test accessors
System.out.println("numerator is " + f.getNumerator() + " and denominator is " + f.getDenominator());
System.out.println(f);
//test constructor
Fraction g= new Fraction(8,19);
System.out.println(g);
Scanner keyboard = new Scanner (System.in);
//get the data for the next fraction and construct it
int n1=keyboard.nextInt();
int d1=keyboard.nextInt();
Fraction one=new Fraction (n1,d1);
//get the data for the next fraction and construct it
n1=keyboard.nextInt();
d1=keyboard.nextInt();
Fraction two=new Fraction (n1,d1);
//test methods for add, subtract, multiply, divide
System.out.println(one + " + " + two + " = " + one.add(two));
System.out.println(one + " - " + two + " = " + one.subtract(two));
System.out.println(one + " * " + two + " = " + one.multiply(two));
System.out.println(one + " divided by " + two + " = " + one.divide(two));
  
}
  
}

Answer 1

import java.util.Scanner;

public class H4 {

    public static class Fraction {
        private int numerator;
        private int denominator;

        public Fraction() {
            numerator = 0;
            denominator = 1;
        }

        public Fraction(int numerator, int denominator) {
            this.numerator = numerator;
            this.denominator = denominator;
        }

        public int getNumerator() {
            return numerator;
        }

        public void setNumerator(int numerator) {
            this.numerator = numerator;
        }

        public int getDenominator() {
            return denominator;
        }

        public void setDenominator(int denominator) {
            this.denominator = denominator;
        }

        public Fraction add(Fraction rhs) {
            return new Fraction(numerator * rhs.denominator + rhs.numerator * denominator, denominator * rhs.denominator);
        }

        public Fraction subtract(Fraction rhs) {
            return new Fraction(numerator * rhs.denominator - rhs.numerator * denominator, denominator * rhs.denominator);
        }

        public Fraction multiply(Fraction rhs) {
            return new Fraction(numerator * rhs.numerator, denominator * rhs.denominator);
        }

        public Fraction divide(Fraction rhs) {
            return new Fraction(numerator * rhs.denominator, rhs.numerator * denominator);
        }

        @Override
        public String toString() {
            return numerator + "/" + denominator;
        }
    }

    public static void main(String[] args) {
        Fraction f = new Fraction();
//test default constructor
        System.out.println(f);
//test mutators
        f.setNumerator(4);
        f.setDenominator(5);
//test accessors
        System.out.println("numerator is " + f.getNumerator() + " and denominator is " + f.getDenominator());
        System.out.println(f);
//test constructor
        Fraction g = new Fraction(8, 19);
        System.out.println(g);
        Scanner keyboard = new Scanner(System.in);
//get the data for the next fraction and construct it
        int n1 = keyboard.nextInt();
        int d1 = keyboard.nextInt();
        Fraction one = new Fraction(n1, d1);
//get the data for the next fraction and construct it
        n1 = keyboard.nextInt();
        d1 = keyboard.nextInt();
        Fraction two = new Fraction(n1, d1);
//test methods for add, subtract, multiply, divide
        System.out.println(one + " + " + two + " = " + one.add(two));
        System.out.println(one + " - " + two + " = " + one.subtract(two));
        System.out.println(one + " * " + two + " = " + one.multiply(two));
        System.out.println(one + " divided by " + two + " = " + one.divide(two));
    }
}

0/1 numerator is 4 and denominator is 5 4/5 8/19 2/5 + 7/9 = 53/45 2/5 - 7/9 = -17/45 2/5 * 7/9 = 14/45 2/5 divided by 7/9 = 18/35