String format and conversion between data types

[Chatura Atapattu]

I had two pretty basic questions:

1. Where can I find documentation on the format to provide in a print command?  I see that Console.OUT.print() takes a format and the variables, but using the basic C/Java style formats failed.

2. I'm trying to convert a long to a double.  However, the only way I found was doing something like this:

val longVal = 5;

val doubleVal = Double.parseDouble(longVal.toString());

There must be a simpler way to do this, but what is it?

Thanks!

- Chat 

[Karthik Kumar Srivatsa]

1) Console.OUT.println is very similar to Sytem.out.println in java.
2) To typecast use:
val l: long = 5;
val d: double = l as double;

Karthik

[Martha Kim]

Hi Chat,

1. Where can I find documentation on the format to provide in a print command?  I see that Console.OUT.print() takes a format and the variables, but using the basic C/Java style formats failed.

Looks like you want printf(), not print().  Here is the documentation for x10.io.Printer, the type for Console.OUT: http://dist.codehaus.org/x10/xdoc/2.1.0/x10/io/Printer.html

 

2. I'm trying to convert a long to a double.  However, the only way I found was doing something like this:

val longVal = 5;

val doubleVal = Double.parseDouble(longVal.toString());

There must be a simpler way to do this, but what is it?

Try this:

val doubleVal = Double.fromLongBits(longVal)

http://dist.codehaus.org/x10/xdoc/2.1.0/x10/lang/Double.html

[Chatura Atapattu]

1. I meant printf.  I realized that I was trying to use print instead of printf.

2. Thanks.  Is that the only other way?

[Chatura Atapattu]

On Wed, Dec 8, 2010 at 1:47 PM, Martha Kim <mar...@cs.columbia.edu> wrote:

Hi Chat,

1. Where can I find documentation on the format to provide in a print command?  I see that Console.OUT.print() takes a format and the variables, but using the basic C/Java style formats failed.

Looks like you want printf(), not print().  Here is the documentation for x10.io.Printer, the type for Console.OUT: http://dist.codehaus.org/x10/xdoc/2.1.0/x10/io/Printer.html

Correct, got it working.

 

 

2. I'm trying to convert a long to a double.  However, the only way I found was doing something like this:

val longVal = 5;

val doubleVal = Double.parseDouble(longVal.toString());

There must be a simpler way to do this, but what is it?

Try this:

val doubleVal = Double.fromLongBits(longVal)

http://dist.codehaus.org/x10/xdoc/2.1.0/x10/lang/Double.html

No go.  Reading around, I feel like this is used to convert a binary string in long format to a IEEE double.

[Martha Kim]

2. I'm trying to convert a long to a double.  However, the only way I found was doing something like this:

val longVal = 5;

val doubleVal = Double.parseDouble(longVal.toString());

There must be a simpler way to do this, but what is it?

Try this:

val doubleVal = Double.fromLongBits(longVal)

http://dist.codehaus.org/x10/xdoc/2.1.0/x10/lang/Double.html

No go.  Reading around, I feel like this is used to convert a binary string in long format to a IEEE double.

If this doesn't work I'd go w. Karthik's technique, that appears to be the only other technique viable technique that particular piece of documentation mentions.  I looked at the Math library, but round() etc. don't seem to convert types.

[Chatura Atapattu]

Thanks you.