How to call delegate methods from other class in Swift?

Fraction class, help via java oop?

• Write a Fraction class that implements these methods: add ─ This method receives a Fraction parameter and adds the parameter fraction to the calling object fraction. multiply ─ This method receives a Fraction parameter and multiplies the parameter fraction by the calling object fraction. print ─ This method prints the fraction using fraction notation (1/4, 21/14, etc.) printAsDouble ─ This method prints the fraction as a double (0.25, 1.5, etc.) Separate accessor methods for each instance variable in the Fraction class. b) Modify the code so that it can handle negative numerators and negative driver public static void main(String[] args) { Scanner stdIn = new Scanner(System.in); Fraction c, d, x; // Fraction objects System.out.println("Enter numerator; then denominator."); c = new Fraction(stdIn.nextInt(), stdIn.nextInt()); c.print(); System.out.println("Enter numerator; then denominator."); d = new Fraction(stdIn.nextInt(), stdIn.nextInt()); d.print(); x = new Fraction(); // create a fraction for number 0 System.out.println("Sum:"); x.add(c).add(d); x.print(); x.printAsDouble(); x = new Fraction(1, 1); // create a fraction for number 1 System.out.println("Product:"); x.multiply(c).multiply(d); x.print(); x.printAsDouble(); System.out.println("Enter numerator; then denominator."); x = new Fraction(stdIn.nextInt(), stdIn.nextInt()); x.printAsDouble(); } // end main Note that this demonstration driver does not call the accessor methods. That’s OK. Accessor methods are often implemented regardless of whether there’s an immediate need for them. That’s because they are very useful methods in general and providing them means that future code can use them when the need arises. what i have so far, I cant seem to fill int the blanks public class Fraction { private int numerator; private int denominator; public Fraction( int numerator, int denominator ) { this.numerator = numerator; //A Fraction cannot have a zero denominator if( denominator != 0 ) { this.denominator = denominator; } else { this.denominator = 1; } } public int getNumerator() { return numerator; } public int getDenominator() { return denominator; } //public Fraction add ( Fraction) { } public Fraction multiply( Fraction otherFraction ) { return new Fraction( otherFraction.getNumerator() * this.getNumerator(), otherFraction.getDenominator() * this.getDenominator() ); } public void print() { } public void printAsDouble() { } private void reduce() { } }

• Answer:

  public Fraction add ( Fraction A) { Fraction X=new Fraction(( numerator*A.denominator + A.numerator*denominator ), numerator*A.numerator ); X.reduce(); return X; } public Fraction multiply( Fraction otherFraction ) { return new Fraction( otherFraction.getNumerator() * this.getNumerator(), otherFraction.getDenominator() * this.getDenominator() ); } public void print() { System.out.println(numerator + "/"+denominator); } public void printAsDouble() { double x= (double)numerator/(double)denominator; System.out.println(x); } private void reduce() {//this is supposed to calculate GCF and divide both denominator and numerator with them int x=denominator < numerator? denominator:numerator; while(x>1) { if( (numerator%x==0) && (numerator%x==0)) break; x--; } //x is now GCF denominator /=x; numerator /=x; }