arithmatic functions between reciever and argument

[jjinx]

I need to add the reciever object and the arguement of a method in a seperate class.

class CashRegister{

public void computesubtotal(){
subtotal.plus(itemprice);
}//end computesubtotal

}//end CashRegister


class DollarAmount{

public DollarAmount plus(int increment){

.......what goes here to add subtotal and itemprice
}//end plus

}//end DollarAmount

 

[Targol]

Well, I need more informations to help :
- is your "DollarAmount" class a subclass of your "CashRegister" class ?
- is your "subtotal" var (in "CashRegister" class) of "DollarAmount" type ? Water is not bad as soon as it stays out human body ;-)

 

[jjinx]

Targol,

The two vars are of compatable types.
The subtotal is of type DollarAmount wihich is stored as a long and increment is an int.

The DollarAmount class is not a subclass of CashRegister.

I need to know how to access the reciver object of the plus method from within the plus method.


ex: subtotal.plus(increment)

I must add increment to the subtotal.

 

[Targol]

If you store the current value of your DollarAmount class inside it, it's quite simple :

class CashRegister{

    DollarAmount subtotal = new DollarAmount();

    public void computesubtotal(){  
      subtotal.plus(itemprice);
    }//end computesubtotal

    // now you can use subtotal.getValue();
}//end CashRegister

class DollarAmount{

    private long curentValue=0;

    public void plus(int increment){
      curentValue += increment;
    }//end plus

    public long getValue() { return curentValue; }
    public void setValue(long newValue) { curentValue = newValue; }

}//end DollarAmount

Water is not bad as soon as it stays out human body ;-)