Some simple help please!

[jjd712]

Some background... this is my second week in java and so far its going great in my comp sci class, but some of the eIMACS labs are killing me.



In the following code segment, a and b are non-negative doubles. Write code that assigns to b the result of rounding a to one decimal place.

// Enter a value to test here
double a = ;
double b;

// Enter your code here

I have tried to use Math.round(a,1); to round to one decimal place, its not working and i have no idea how to do it any other way, any help will be great.

[Norm]

its not working

Can you post the code you executed and its output that shows the problem.

[jjd712]

// Enter a value to test here
double a =6.05000001 ;
double b;

// Enter your code here
b = Math.round(a,1);

After running this error occurs:

TC1.java:16: cannot find symbol

symbol : method round(double,int)

[Norm]

cannot find symbol

That says the compiler can not find a definition for a round method with the args of double and int.
Where did you see that method defined? Do you have the correct import statement to tell the compiler where the method is defined?

[jjd712]

um, i did not add a import statement b/c i assumed the complier in eimacs already had that. I would need to use

import java.lang.Math;

right?

[Norm]

Where is the method defined that you are trying to use? Where did you see doc for how to code it?

EDIT: Sorry, I don't know anything about eimacs.

[jjd712]

Um i.. don't know.

This might help, its all i'm really given
Capture.jpg

[Norm]

Do you know where the Java SE packages and classes and their methods are defined? You need to have a link to the site where the API doc is:
Java Platform SE 7

Instead of making up method names and their args, go to the API doc and find one that will work.

[jjd712]

Ok, ill try and find one that works.

Thanks for the help.

[Norm]

What has been discussed in your class so far? What techniques have you been shown?

[firecool67]

Kind of old, and kind of a stupid way to do it but here you go.
...

[copeg]

firecool67, welcome to the forums. Please read the following:
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