Add a public method called add() to the Java program below. This method adds another fraction to the ‘calling object’. Thus, the method will take a Fraction class object as a parameter, add this parameter fraction to the calling object (fraction), and return a Fraction object as a result. NOTE: it is possible to use cross multiplication to determine the numerator of the resultant Fraction. The denominator of the resultant Fraction is simply the multiplication of the denominators of the two other Fractions.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Add a public method called add() to the Java program below. This method
adds another fraction to the ‘calling object’. Thus, the method will take a
Fraction class object as a parameter, add this parameter fraction to the calling
object (fraction), and return a Fraction object as a result.

NOTE: it is possible to use cross multiplication to determine the numerator of the resultant Fraction. The denominator of the resultant Fraction is simply the multiplication of the denominators of the two other Fractions.

JAVA PROGRAM:

import java.util.ArrayList;

import java.util.Scanner;

 

//Define the class Fraction

class Fraction

 

{

private int n, d;

public Fraction()

{

 

this.n = this.d = 0; //Initialize the values

}

 

public Fraction(int n, int d)

{

this.n = n; //Initialize the variables

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);

 

}

 

public boolean isequals(Object c)

{

Fraction f = (Fraction) c;

return(Integer.compare(n,f.n))==0

&& (Integer.compare(d,f.d)==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(); // appending a sign.

//if the denominator is zero

else

result = "-" + getNum() + "/" + (getDen() * -1); // appending a sign.

}

 

//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 Main

{

//Define the main method

public static void main(String[] args)

{

//Declare the variables to store the numerator and denominator

String res;

int num, den, num1, den1;

//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);

 

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

num1 = Integer.parseInt(sc.nextLine().trim());

if(num1 < 0)

break;

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

den1 = Integer.parseInt(sc.nextLine().trim());

 

Fraction fraction1 = new Fraction(num1, den1);

if(fraction1.isequals(fraction))

{

 

System.out.println("\nTrue-> Second fraction is equal to First Fraction");

}

else

System.out.println("\nFalse-> Second fraction is not equal to First Fraction"); // if isequal() returns zero.

//Add the resultant fractions into the ArrayList

fractions.add(fraction);

//Display the resultant fraction

res = fraction.getSimplifiedFraction();

System.out.println("Fraction added to list as: " + res + "\n"); //result is stored in ‘res’ variable

}while(res != "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();

}

}

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