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Thread: Using a method to add two classes and produce a third

  1. #1
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    Default Using a method to add two classes and produce a third

    Hey community i was assigned a home work asking me to create a method to add two instances of a fraction object and have the output be a new instance .


    here is the prompt i was given

    "Provide a method add that receives a second fraction as an argument, and returns a new fraction which is the sum of fractions. Example: Fraction r3 = r1.add( r2 );"

    could someone please explain how this is done ?


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    Super Moderator Norm's Avatar
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    Default Re: Using a method to add two classes and produce a third

    Do you know how to create an instance of a class? Hint: Use the new statement.
    Take values from the current class and the passed argument, create an instance of the class with those values and return it.

  3. The Following User Says Thank You to Norm For This Useful Post:

    shamman84 (February 5th, 2012)

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    Default Re: Using a method to add two classes and produce a third

    Thanks for the response Norm , i know how to create the instances im just having trouble understanding how my method is taking the values from both classes and producing a new instance with the new values .

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    Default Re: Using a method to add two classes and produce a third

    Take it one step at a time.
    Where are the values located?
    One is local,
    the other is in the passed object. You'll need to call a method to get it.
    How are the two values added together to get a result?
    How do you use that resultant value to create the new instance?

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    Default Re: Using a method to add two classes and produce a third

    What is my method returning can it return a new instance of the class if so what is the syntax ? public ___ add(Fraction a)

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    Default Re: Using a method to add two classes and produce a third

    Look at how the call is made:
    Fraction r3 = r1.add( r2 );"
    What data type is r3?
    That is what the add method must return.

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    shamman84 (February 5th, 2012)

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    Default Re: Using a method to add two classes and produce a third

    Norm you are BRILLIANT thankyou for all of your help here is the code do you have any further pointers ?

    public Fraction add(Fraction f)
    {
    int n,d;
    if(denominator == f.getDenominator())
    {
    n = numerator + f.getNumerator();
    d = denominator ;
    return new Fraction (n,d);
    }
    else {
    d = denominator*f.getDenominator() ;
    n = ((numerator*f.getDenominator())+(f.getNumerator()* denominator));
    return new Fraction(n,d);
    }
    Last edited by shamman84; February 5th, 2012 at 08:21 PM.

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