FractionTest/Fraction.java at f65a890300d68d2c2902edf62110f6b317fd0c26 · mlitman/FractionTest · GitHub

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/**
 * Fixed the Fraction clas attributes
 *
 * Fixed the toString and toDouble
 *
 * Added Arithmetic operations for 2 fractions
 * */
public class Fraction {
	private int numerator;
	private int denominator;


	/**
	 * Constructs a fraction with 0 as numerator and 0 as denominator
	 * */
	public Fraction(){
		this.numerator = 0;
		this.denominator = 0;
	}

	/**
	 * Constructs a fraction with numerator assigned to numerator, and denominator assigned to denominator
	 * */
	public Fraction( int numerator, int denominator){
		this.numerator = numerator;
		this.denominator = denominator;
	}

	/**
	 * Returns the numerator of the fraction
	 * */
	public int getNumerator(){
		return numerator;
	}

	/**
	 * Returns the denominator of the fraction
	 * */
	public int getDenominator(){
		return denominator;
	}


	/**
	 * Sets the numerator of the fraction
	 * */
	public void setNumerator(int numerator){
		this.numerator = numerator;
	}

	/**
	 * Sets the denominator of the fraction
	 * */
	public void setDenominator(int denominator){
		this.denominator = denominator;
	}

	/**
	 * Computes the Greatest Common Divisor(GCD) using Euclid's algorithm
	 * */
	private int computeGCD(int firstNum, int secondNum){
		if (firstNum == 0)
			return secondNum;

		return computeGCD(secondNum % firstNum, firstNum);
	}

	/**
	 * Returns a string showing the fraction
	 * */
	public String toString(){
		return this.numerator + " / " + this.denominator;
	}

	/**
	 * Returns the double value of the  fraction
	 * */
	public double toDouble(){
		return (double) this.numerator / this.denominator;
	}


	/**
	 * Method that adds the two fractions
	 * */
	public Fraction add(Fraction fraction){

		int numAnswer = 0;
		int denAnswer = 0;

		denAnswer = (computeGCD(this.denominator, fraction.getDenominator()));

		denAnswer = (this.denominator * fraction.getDenominator()) / denAnswer;

		numAnswer  = ((this.numerator) * (denAnswer/this.denominator)) + (fraction.getNumerator() * (denAnswer / fraction.getDenominator()));

		Fraction additionAnswer = new Fraction(numAnswer, denAnswer);

		return additionAnswer;
	}

	/**
	 * Method that subtracts the two fractions
	 * */
	public Fraction subtract(Fraction fraction){

		int denAnswer = 0;
		int numAnswer = 0;

		denAnswer = (computeGCD(this.denominator, fraction.getDenominator()));

		denAnswer = (this.denominator * fraction.getDenominator()) / denAnswer;

		numAnswer  = ((this.numerator) * (denAnswer/this.denominator)) - (fraction.getNumerator() * (denAnswer / fraction.getDenominator()));

		Fraction subtractionAnswer = new Fraction(numAnswer, denAnswer);

		return subtractionAnswer;
	}

	/**
	 * Method that multiplies the two fractions
	 * */
	public Fraction multiplyBy(Fraction fraction){
		int numAnswer = 0;
		int denAnswer = 0;

		numAnswer = (this.numerator * fraction.getNumerator());
		denAnswer = (this.denominator * fraction.getDenominator());

		Fraction multiplicationAnswer = new Fraction(numAnswer, denAnswer);

		return multiplicationAnswer;
	}

	/**
	 * Method that divides the two fractions
	 * */
	public Fraction divideBy(Fraction fraction){
		int numAnswer = 0;
		int denAnswer = 0;

		numAnswer = (this.numerator * fraction.getDenominator());
		denAnswer = (this.denominator * fraction.getNumerator());

		Fraction divisionAnswer = new Fraction(numAnswer, denAnswer);

		return divisionAnswer;
	}


	/**
	 * Reduces a fraction into its lowest form
	 * */
	public Fraction reduceFraction(){
		int GCD = 0;

		GCD = computeGCD(this.numerator, this.denominator);

		Fraction reducedFraction = new Fraction((this.numerator / GCD), (this.denominator / GCD));

		return reducedFraction;
	}
}