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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 ?
Related threads:
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.
shamman84 (February 5th, 2012)
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 .
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?
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)
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.
shamman84 (February 5th, 2012)
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 09:21 PM.
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