printing doubles

I am troubleshooting an app which uses doubles and am therefore trying to print them using System.println(). But when I do this nothing appears. If I convert to float, i.e. System.println(d.toFloat()) this works fine, but I loose the precision and this is what I am trying to troubleshoot.

Is a bug? Should println() be able to print doubles? Is there any way to do this?

Former Member over 9 years ago

Read the Api documentation

Hi i recomend to read the documentation, you have to define that the var atribute is a float, only in that case the value is going to show decimal.
http://developer.garmin.com/connect-iq/developer-tools/functions/

var n = null; // Null reference

  var x = 5; // 32 bit signed integers

  var y = 6.0; // 32 bit floating point

  var l = 5l; // 64 bit signed integers

  var d = 4.0d; // 64 bit floating point

  var bool = true; // Boolean (true or false)

  var arr = new [20 + 30]; // Array of size 50

  var str = "Hello"; // String var dict = { x=>y }; // Dictionary: key is 5, value is 6.0

  var z = arr[2] + x; // Null pointer waiting to happen

to show decimals format:

var a = value/10.0
you have tell to the atribute that the result is an float, in this case addind the .0

print(a.format("%.2f))http://developer.garmin.com/connect-iq/developer-tools/functions/

gasteropod over 9 years ago

I have read the documentation, I think you miss the point.

The problem was that System.println() will print floating point variables natively but will not print doubles natively:

var f = 0.123456789;
var d = 0.123456789d;
System.println(f);
System.println(d);

shows only:

0.123457

i.e. only the floating point number was printed, the double was not. But I did find that if you use format you can get it to print by converting to a string before printing:

var f = 0.123456789;
var d = 0.123456789d;
System.println(f.format("%.9f"));
System.println(d.format("%.9f"));

which shows:

0.123456791
0.123456789

So this does beg the question, why can println() print floats but not doubles. Although I have a solution to my problem.

Former Member over 9 years ago

This looks like a bug to me, I'll create a ticket to investigate.

Brandon.ConnectIQ over 9 years ago

We were able to reproduce this in the 1.1.4 SDK on Windows only, but it's not an issue in 1.2.0. For now, you'll need to use the format-as-float fix, but that won't be necessary once 1.2.0 is released.

gasteropod over 9 years ago

Thanks Brandon.