Do not know how to solve this

[jaylimix]

Hi I'm a new student of java programming. I ran this code, there's a problem but I do not know how to solve it. Please help.

public class Q3 {

	double length=5, width=8, height=9, radius=6;

    public static double volume(double length, double width, double height) {

    	double box= length * width * height;

    	return box;
    }

    public static void main(String[] args){

    	System.out.println("The volume of rectangular box is "+ volume());
    }
}

[goldest]

Pass the parameters to your volume method.

Goldest

[jaylimix]

Hi I've made amendments to it and it works, thanks Goldest!

System.out.println("The volume of rectangular box is "+ volume(5,8,9));

Initially I put the parameters as

System.out.println("The volume of rectangular box is "+ volume(length,width,height));

Question, is there a way I can pass English words as parameters instead of numbers?

[JosAH]

Hi I've made amendments to it and it works, thanks Goldest!
System.out.println("The volume of rectangular box is "+ volume(5,8,9));
Initially I put the parameters as
System.out.println("The volume of rectangular box is "+ volume(length,width,height));

Question, is there a way I can pass English words as parameters instead of numbers?

Sure you can as long as you define those English words to be visible variables; here you define three local variables in your main( ... ) method:

double length= 5.0;
double width= 8.0;
double height= 9.0;

Next you can call your method as:

System.out.println("The volume of rectangular box is "+ volume(length,width,height));

kind regards,

Jos

[goldest]

System.out.println("The volume of rectangular box is "+ volume(length,width,height));

This should be the proper way. What happened when you tried this?

[JosAH]

This should be the proper way. What happened when you tried this?

No, those variables are instance variables but there is no instance.

kind regards,

Jos

[jaylimix]

Goldest and Jos, when I tried this, it has errors:

System.out.println("The volume of rectangular box is "+ volume(length, width, height));
    	                                                                              ^
3 errors

What does this mean?

[goldest]

No, those variables are instance variables but there is no instance.

Yeah, I know. I actually wanted the OP to come up with "Cannot make a static reference to the non-static field" error. That way he would have learned how to do it. Nothing else.

And yes, having those variables local would resolve the things in first place.

Goldest

[jaylimix]

Yeah, I know. I actually wanted the OP to come up with "Cannot make a static reference to the non-static field" error. That way he would have learned how to do it. Nothing else.

And yes, having those variables local would resolve the things in first place.

Goldest

Yes true it does comes up with that

non-static variable length cannot be referenced from a static context
System.out.println("The volume of rectangular box is "+ volume(length, width, height));
^

[jaylimix]

Ya I manage to make it work by adding a static in front of the variable. It's just guessing for me based on the error.

[goldest]

Yes true it does comes up with that

Good. Now go back and see what Jos had said in post 4,

here you define three local variables in your main( ... ) method:

I hope that would make it clear.

Goldest

[goldest]

Ya I manage to make it work by adding a static in front of the variable. It's just guessing for me based on the error.

Aahh, well thats another way.

Considering that you are new to Java, I would strongly suggest you to have a look at the common java errors here : Top Ten Errors Java Programmers Make.

Hope that would be beneficial for you.

Goldest

[jaylimix]

Ya I got what you guys mean about the define as local variable Thanks for the help! Thanks for link too.

[goldest]

You're welcome!

Keep coming back here in case of any further problems.

Goldest