Ensure that the input values representing fractions are stored with denominators that are positive integers. It doesn't require the user to only enter a positive denominator value; the user should not be inconvenienced by such a restriction. For example, whilst values of 1 / -2 are acceptable inputs for a fraction, the output representation should be -1 / 2. Solution should check the denominator input; if it is negative, swap the sign of both numerator and denominator instance variables. Test this functionality with  TestFraction class. //Import the essential package import java.util.ArrayList; import java.util.Scanner; //Define the class Fraction class Fraction { //Declare the variables to store the numerator and denominator private int n, d; //Define the default constructor public Fraction() { //Initialize the values this.n = this.d = 0; } //Define the parameterized constructor public Fraction(int n, int d) { //Initialize the variables this.n = n; this.d = d; } //Define the getter function getNum() that returns the numerator public int getNum() { //Returns numerator return n; } //Define the getter function getDen() that returns the denominator public int getDen() { //Returns denominator return d; } //Define the boolean function isZero() that returns 0 if numerator is 0 and denominator is not equals to zero public boolean isZero() { return (getNum() == 0 && getDen() != 0); } //Define the function getSimplifiedFraction() that returns the simplified fraction public String getSimplifiedFraction() { //Decalre the string variable result to store the result String result = ""; //if the numerator and denominator both are zero if(getNum() == 0 && getDen() == 0) //result is zero result = "0"; //if the numerator is zero and denominator is non-zero else if(isZero()) //result is zero result = "0"; //if the numerator is non-zero and denominator is zero else if(getNum() != 0 && getDen() == 0) //result is Undefined result = "Undefined"; //for a defined and non-zero fraction else { //if the remainder is zero if(getNum() % getDen() == 0) result = (getNum() / getDen()) + ""; //if the numerator and denominator both are greater than zero else if(getNum() < 0 && getDen() < 0) result = (getNum() * -1) + "/" + (getDen() * -1); //if any of them is zero else if(getNum() < 0 || getDen() < 0) { //if the numerator is greater than zero if(getNum() < 0) result = "- (" + (getNum() * -1) + "/" + getDen() + ")"; //if the denominator is zero else result = "- (" + getNum() + "/" + (getDen() * -1) + ")"; } //both are non-zero else result = (getNum() + "/" + getDen()); } //return the result return result; } //Define the method display() that displays the resultant fraction public void display() { //Call and display the fraction System.out.println(getSimplifiedFraction()); } } //Define the class TestFraction class TestFraction { //Define the main method public static void main(String[] args) { //Declare the variables to store the numerator and denominator int num, den; //Declare an ArrayList to store the results ArrayList fractions = new ArrayList<>(); //Create the object for scanner class Scanner sc = new Scanner(System.in); //use the do-while loop to iterate test the conditions do { //Prompts the user to enter the numerator System.out.print("Enter the num: "); //Store the Integer part only num = Integer.parseInt(sc.nextLine().trim()); //If the numerator is less than zero if(num < 0) //Break from loop break; //Prompts the user to enter the denominator System.out.print("Enter the den: "); //store the integer part only den = Integer.parseInt(sc.nextLine().trim()); //Create the object of Fraction class Fraction fraction = new Fraction(num, den); //Add the resultant fractions into the ArrayList fractions.add(fraction); //Display the resultant fraction System.out.println("Fraction added to list as: " + fraction.getSimplifiedFraction() + "\n"); }while(num >= 0); //Display all fractions that are stored in the ArrayList System.out.println("\nDISPLAYING ALL FRACTIONS:\n" + "-------------------------"); //Use the loop to display the values stored in the ArrayList for(Fraction fr : fractions) fr.display(); //to print the new line System.out.println(); } }

 Ensure that the input values representing fractions are stored with denominators that are positive integers. It doesn't require the user to only enter a positive denominator value; the user should not be inconvenienced by such a restriction. For example, whilst values of 1 / -2 are acceptable inputs for a fraction, the output representation should be -1 / 2. Solution should check the denominator input; if it is negative, swap the sign of both numerator and denominator instance variables. Test this functionality with  TestFraction class.

//Import the essential package

import java.util.ArrayList;

import java.util.Scanner;

//Define the class Fraction

class Fraction

{

//Declare the variables to store the numerator and denominator

private int n, d;

//Define the default constructor

public Fraction()

{

//Initialize the values

this.n = this.d = 0;

}

//Define the parameterized constructor

public Fraction(int n, int d)

{

//Initialize the variables

this.n = n;

this.d = d;

}

//Define the getter function getNum() that returns the numerator

public int getNum()

{

//Returns numerator

return n;

}

//Define the getter function getDen() that returns the denominator

public int getDen()

{

//Returns denominator

return d;

}

//Define the boolean function isZero() that returns 0 if numerator is 0 and denominator is not equals to zero

public boolean isZero()

{

return (getNum() == 0 && getDen() != 0);

}

//Define the function getSimplifiedFraction() that returns the simplified fraction

public String getSimplifiedFraction()

{

//Decalre the string variable result to store the result

String result = "";

//if the numerator and denominator both are zero

if(getNum() == 0 && getDen() == 0)

//result is zero

result = "0";

//if the numerator is zero and denominator is non-zero

else if(isZero())

//result is zero

result = "0";

//if the numerator is non-zero and denominator is zero

else if(getNum() != 0 && getDen() == 0)

//result is Undefined

result = "Undefined";

//for a defined and non-zero fraction

else

{

//if the remainder is zero

if(getNum() % getDen() == 0)

result = (getNum() / getDen()) + "";

//if the numerator and denominator both are greater than zero

else if(getNum() < 0 && getDen() < 0)

result = (getNum() * -1) + "/" + (getDen() * -1);

//if any of them is zero

else if(getNum() < 0 || getDen() < 0)

{

//if the numerator is greater than zero

if(getNum() < 0)

result = "- (" + (getNum() * -1) + "/" + getDen() + ")";

//if the denominator is zero

else

result = "- (" + getNum() + "/" + (getDen() * -1) + ")";

}

//both are non-zero

else

result = (getNum() + "/" + getDen());

}

//return the result

return result;

}

//Define the method display() that displays the resultant fraction

public void display()

{

//Call and display the fraction

System.out.println(getSimplifiedFraction());

}

}

//Define the class TestFraction

class TestFraction

{

//Define the main method

public static void main(String[] args)

{

//Declare the variables to store the numerator and denominator

int num, den;

//Declare an ArrayList to store the results

ArrayList<Fraction> fractions = new ArrayList<>();

//Create the object for scanner class

Scanner sc = new Scanner(System.in);

//use the do-while loop to iterate test the conditions

do

{

//Prompts the user to enter the numerator

System.out.print("Enter the num: ");

//Store the Integer part only

num = Integer.parseInt(sc.nextLine().trim());

//If the numerator is less than zero

if(num < 0)

//Break from loop

break;

//Prompts the user to enter the denominator

System.out.print("Enter the den: ");

//store the integer part only

den = Integer.parseInt(sc.nextLine().trim());

//Create the object of Fraction class

Fraction fraction = new Fraction(num, den);

//Add the resultant fractions into the ArrayList

fractions.add(fraction);

//Display the resultant fraction

System.out.println("Fraction added to list as: " + fraction.getSimplifiedFraction() + "\n");

}while(num >= 0);

//Display all fractions that are stored in the ArrayList

System.out.println("\nDISPLAYING ALL FRACTIONS:\n"

+ "-------------------------");

//Use the loop to display the values stored in the ArrayList

for(Fraction fr : fractions)

fr.display();

//to print the new line

System.out.println();

}

}