Fraction

/* Term 2 Assignment 1 - Fraction */
/* A class which is used to represent fractions */
public class Fraction {
    private int numerator;
    private int denominator;

    private static final int NUMERATOR_VAL = 1;
    private static final int DENOMINATOR_VAL = 1;

    // default constructor which creates a fraction 1/1
    public Fraction() {
        this.numerator = NUMERATOR_VAL;
        this.denominator = DENOMINATOR_VAL;
    }

    // If n is positive, set numerator to n. Otherwise, set numerator to 1.
    // If d is positive, set denominator to d. Otherwise, set denominator to 1.
    public Fraction(int n, int d) {
        this.numerator = (n < 0) ? NUMERATOR_VAL : n;
        this.denominator = (d < 0) ? DENOMINATOR_VAL : d;

        // OR USE BELOW!
        /*
        if (n < 0) {
            this.numerator = NUMERATOR_VAL;
        } else {
            this.numerator = n;
        }

        if (d < 0) {
            this.denominator = DENOMINATOR_VAL;
        } else {
            this.denominator = d;
        }

         */
    }

    // Returns the fraction as a string in the format “numerator/denominator”
    public String toString() {
        return numerator + "/" + denominator;
    }

    // Returns any improper (top-heavy) fraction as a mixed number, for example, 2 3/5.
    // If the numerator of the fraction part is 0, return only the integer part of the mixed number.
    // If the fraction is proper, return only the fraction part.
    public String mixedNumber() {
        int whole = (this.numerator / this.denominator);
        int mixedNumerator = (numerator % denominator);
        if (mixedNumerator == 0) {
            return String.valueOf(whole);
        } else if (this.numerator < this.denominator) {
            return this.numerator + "/" + this.denominator;
        } else {
            return whole + " " + mixedNumerator + "/" + this.denominator;
        }
    }

    // If n and d are both positive, add the fraction n/d to this fraction.
    // Otherwise, leave the fractions unchanged.
    // In general the sum of the fractions a/b and c/d is(a*d + c*b)/(b*d).
    public Fraction add(int n, int d) {
        Fraction sum = this;

        if (n > 0 && d > 0) {
            int newNumerator = ((this.numerator * d) + (n * this.denominator));
            int newDenominator = (this.denominator * d);
            sum = new Fraction(newNumerator, newDenominator);
        }
        return sum;
    }
}