Question

I have this program that I need to alter a bit and I am having trouble figuring it out. I need the addition, subtraction, multiplication and division to be changed only. This is the example for the addition part:

public class TestFraction{

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result = f1.addFraction(f2)

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class Fraction{

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public addFraction(fraction OtherFraction)

double a = this.numerator;

double b = this.denominator;

double c = OtherFraction.getNumerator();

double d = OtherFraction.getDenominator();

Fraction result = new Fraction(a * d + b * c, b * d);

return result;

Below is the working program that needs the changes, I just need help with the programming looking the same, but with these slight alterations. Thank you.

import java.util.Scanner;

public class TestFraction {

         public static void main(String[] args) {

         Scanner input = new Scanner(System.in);

        

        

         Fraction f1 = new Fraction();

        

         System.out.print("Enter numerator for myFraction1: ");

         int n1 = input.nextInt();

         f1.setNumerator(n1);

         System.out.print("Enter denominator for myFraction1: ");

         int d1 = input.nextInt();

         f1.setDenominator(d1);

        

         System.out.println();

         System.out.print("Enter numerator for myFraction2: ");

         int n2 = input.nextInt();

         System.out.print("Enter denominator for myFraction2: ");

         int d2 = input.nextInt();

         Fraction f2 = new Fraction(n2, d2);

        

         System.out.println();

         System.out.print("myFraction1 = ");

         f1.printFraction();

         System.out.println();

         System.out.print("myFraction2 = ");

         f2.printFraction();

         System.out.println();

        

         System.out.println();

         System.out.println("The numerator of myFraction1 is: " + f1.getNumerator());

         System.out.println("The denominator of myFraction1 is: " + f1.getDenominator());

         System.out.println();

         System.out.println("The numerator of myFraction2 is: " + f2.getNumerator());

         System.out.println("The denominator of myFraction2 is: " + f2.getDenominator());

        

         System.out.println();

         f1.printFraction();

         System.out.print(" + ");

         f2.printFraction();

         System.out.print(" = ");

         Fraction ADD = new Fraction(f1.getNumerator(), f1.getDenominator());

         ADD.addFraction(f2);

         ADD.printFraction();

         System.out.println();

        

         f1.printFraction();

         System.out.print(" - ");

         f2.printFraction();

         System.out.print(" = ");

         Fraction SUB = new Fraction(f1.getNumerator(), f1.getDenominator());

         SUB.subtractFraction(f2);

         SUB.printFraction();

         System.out.println();

        

         f1.printFraction();

         System.out.print(" * ");

         f2.printFraction();

         System.out.print(" = ");

         Fraction MUL = new Fraction(f1.getNumerator(), f1.getDenominator());

         MUL.multiplyFraction(f2);

         MUL.printFraction();

         System.out.println();

        

         System.out.print("(");

         f1.printFraction();

         System.out.print(") / (");

         f2.printFraction();

         System.out.print(") = ");

         Fraction DIV = new Fraction(f1.getNumerator(), f1.getDenominator());

         DIV.divideFraction(f2);

         DIV.printFraction();

         System.out.println();

         }

        }

        class Fraction

        {

            

        private int numerator;

        private int denominator;

        

        

        Fraction()

        {

        numerator = 0;

        denominator = 1;

        }

        

        Fraction(int n, int d)

        {

        numerator = n;

        denominator = d;

        }

        

        public int getNumerator()

        {

        return numerator;

        }

        

        public int getDenominator()

        {

        return denominator;

        }

        

        public void setNumerator(int n)

        {

        numerator = n;

        }

        

        public void setDenominator(int d)

        {

        denominator = d;

        }

    

        public void printFraction()

        {

        System.out.print(numerator + " / " + denominator);

        }

    

        public static int gcd(int a, int b)

        {

        if(b==0)

        return a;

        else

        return gcd(b, a%b);

        }

        

        void reduceFraction()

        {

        int g = gcd(numerator, denominator);

        numerator = numerator/g;

        denominator = denominator/g;

        }

    

        void addFraction(Fraction f2)

        {

        int n1 = numerator;

        int d1 = denominator;

        int n2 = f2.numerator;

        int d2 = f2.denominator;

        

        numerator = (n1*d2) + (n2*d1);

        denominator = d1*d2;

        this.reduceFraction();

        }

        

        void subtractFraction(Fraction f2)

        {

        int n1 = numerator;

        int d1 = denominator;

        int n2 = f2.numerator;

        int d2 = f2.denominator;

        

        numerator = (n1*d2) - (n2*d1);

        denominator = d1*d2;

        this.reduceFraction();

        }

    

        void multiplyFraction(Fraction f2)

        {

        int n1 = numerator;

        int d1 = denominator;

        int n2 = f2.numerator;

        int d2 = f2.denominator;

        

        numerator = n1*n2;

        denominator = d1*d2;

        this.reduceFraction();

        }

        

        void divideFraction(Fraction f2)

        {

        int n1 = numerator;

        int d1 = denominator;

        int n2 = f2.numerator;

        int d2 = f2.denominator;

        

        numerator = n1*d2;

        denominator = d1*n2;

        this.reduceFraction();

        }

            }

Answer 1

package com.HomeworkLib.fractions;

public class Fraction {

   private int numerator;
   private int denominator;

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

   public Fraction(int numerator, int denominator) {
       super();
       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 static int gcd(int a, int b)

   {
       if (b == 0)
           return a;
       else
           return gcd(b, a % b);
   }

   void reduceFraction()

   {
       int g = gcd(numerator, denominator);
       numerator = numerator / g;
       denominator = denominator / g;
   }

   void addFraction(Fraction f1, Fraction f2) {
       numerator = (f1.numerator * f2.denominator) + (f2.numerator * f1.denominator);
       denominator = f1.denominator + f2.denominator;
       reduceFraction();
       printFraction(f1, f2, '+');
   }

   void subtractFraction(Fraction f1, Fraction f2) {
       numerator = (f1.numerator * f2.denominator) - (f2.numerator * f1.denominator);
       denominator = f1.denominator + f2.denominator;
       reduceFraction();
       printFraction(f1, f2, '-');
   }

   void multiplyFraction(Fraction f1, Fraction f2) {
       numerator = (f1.numerator * f2.numerator);
       denominator = f1.denominator * f2.denominator;
       reduceFraction();
       printFraction(f1, f2, '*');
   }

   void divideFraction(Fraction f1, Fraction f2) {
       numerator = (f1.numerator / f2.numerator);
       denominator = f1.denominator / f2.denominator;
       reduceFraction();
       printFraction(f1, f2, '/');
   }

   public void printFraction(Fraction f1, Fraction f2, char ch) {
       System.out.println(f1.numerator + "/" + f1.denominator + " " + ch +" " + f2.numerator + "/" + f2.denominator + " = "
               + this.numerator + "/" + this.denominator);
   }

}

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package com.HomeworkLib.fractions;

import java.util.Scanner;

public class TestFraction {
  
   public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
      
       Fraction f1 = new Fraction();
       System.out.println("Enter numerator for myFraction1: ");
       int n1 = input.nextInt();
       f1.setNumerator(n1);
       System.out.println("Enter denominator for myFraction1: ");
       int d1 = input.nextInt();
       f1.setDenominator(d1);
      
       Fraction f2 = new Fraction();
       System.out.println("Enter numerator for myFraction2: ");
       int n2 = input.nextInt();
       f2.setNumerator(n2);
       System.out.println("Enter denominator for myFraction2: ");
       int d2 = input.nextInt();
       f2.setDenominator(d2);
      
       Fraction obj=new Fraction();
      
       obj.addFraction(f1,f2);
       obj.subtractFraction(f1,f2);
       obj.multiplyFraction(f1,f2);
       obj.divideFraction(f1,f2);
   }

}

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I have made some changes to your methods.

Hope i have answered your question. Please give review.

Regards