8 replies to this topic

[lemy]

Guys help a newbie here :P,
My problem is: how to convert integer into double in an arguments or in a method? is that possible?.
here is my code :

 public class MultimediaComputer extends Computer{

    protected int cdrom;

    protected double no;

    


    public MultimediaComputer(int pm,int cd,int cm) {

         super(cd,pm);

         cdrom = cm;

        Cdromspeed(cm); 

 

       }

    

    

    

    public int Cdromspeed(int cm){

        

        return cm;

    }

 

       public void display(){

        System.out.println("Multimedia Computer");

        System.out.println("Processor mode:" + processormode);

        System.out.println("Clock Speed:" + clockspeed);

        System.out.println("CD-ROM speed:" + cdrom);

        

    

    }

} 

then the main:

public class Main{

    public static void main (String  []args){

    Computer e = new Computer(486,166);

    

     // here is my problem the argument accept an integer but not double

    //then i want to put if-else that if the value is >1000 it becomes double or else an integer

    MultimediaComputer o = new MultimediaComputer(1.2,800,48);

    

    

    

    e.display();

    o.display();

    

  

}

}

is that possible or i need to create a new method for conversion?

[Alexander]

Your question sounds conflicting, which argument do you wish to do this checking on, and why must it be a double if over 1000? Can you show an example of what you wish for it to do?

[lemy]

i need the following output :
Multimedia Computer
Processor Mode: 1.2 <- the problem, the parameters declared are (int,int,int) i need to convert pm(processor mode) to double; to input the value 1.2;
Clock Speed:800
CD-ROM Speed: 48

i invoke the processormode to Computer.class

[wim DC]

I'd create 2 constructors:

public MultimediaComputer(int pm,int cd,int cm) {
  super(cd,pm);
  cdrom = cm;
  Cdromspeed(cm);  
}

public MultimediaComputer(double pm, int cd, int cm){
  this((int) pm*1000, cd, cm);
}

I do think it's a bit weird.
I mean you're the programmer, you can make sure that every time you call it, it's in Megahertz, and not in Giga so you don't need the double constructor.

[lemy]

oh i see it is possible to create multiple constructor thanks for the help anyway how can I ouput it into double?

[Alexander]

From what I can gather, you wish to accept either an integer or a double. Wim DC's code can do this, as it is two functions that either handle one or the other.

Both can convert it in to a double and return the double to the parent class, or be converted to a string to be displayed with print or println (it should convert it automatically for you)

[lemy]

Alexander said:

From what I can gather, you wish to accept either an integer or a double. Wim DC's code can do this, as it is two functions that either handle one or the other.

Both can convert it in to a double and return the double to the parent class, or be converted to a string to be displayed with print or println (it should convert it automatically for you)

you hook it sir, but it still return an integer or whole no. if i input 1.8 it returns to 1. :cursing:
i still having lack or unknown syntax here like Wim DC's code I don't know the "this" keyword he used.

[wim DC]

With "this" I just call the other constructor, I change the double into an int propery, so I can use the first constructor with the 3 parameters now.

The fact 1.8 becomes 1 is because if you cast a double (=1.8) to an int, Java just dumps the decimals when converting from double to int.
So, my previous code was a bit wrong, because Java first seems to cast, and then does the math. To solve: add brackets.

this( (int) (pm*1000), cd, cm);

[lemy]

wim DC said:

With "this" I just call the other constructor, I change the double into an int propery, so I can use the first constructor with the 3 parameters now.

The fact 1.8 becomes 1 is because if you cast a double (=1.8) to an int, Java just dumps the decimals when converting from double to int.
So, my previous code was a bit wrong, because Java first seems to cast, and then does the math. To solve: add brackets.

this( (int) (pm*1000), cd, cm);

oh the "this" keyword is very useful, Alright sir Wim DC and Alexander it works thanks you! .