Working with float variables in javascript

Question

Hi all,

I've been trying to use float variables in my code below:

class CodingNode{

var f1aList = new Array(); var f1b; var activity : float = 0.0; var choiceValue = -1;

function CodingNode(){ Debug.Log("Coding node created"); this.activity = 0.0; Debug.Log("Activity = " + activity); choiceValue = 1/2; Debug.Log("Choice = " + choiceValue); }

}

However the Debug messages show "0" for both the variable activity and choiceValue, when they should be showing "0.0" for activity and "0.5" for choiceValue. Any help would be greatly appreciated.

Thanks

Answer 1

Best Answer

Answer by Bampf · Dec 29, 2009 at 11:59 AM

When you write "1/2" you are dividing an integer by an integer. Many languages, including C and Unity JavaScript, assume that you want integer division; the result is therefore truncated to an integer. The fact that it is then assigned to a variable that was declared as a float makes no difference.

To get floating point division, either the numerator or denominator (or both) just needs to be a float.

Also note that Debug.Log does not put a trailing decimal ".0" on whole decimals. So you can't necessarily tell from the output whether a given round number is a float or not.

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Joneson Oh · Dec 29, 2009 at 03:42 PM 0

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hi your answer solved all my problems! i didn't know about the Debug.Log truncating the trailing .0 on decimals. Thank you so much. I can finally carry on with my work proper now.

Answer 2

Answer by Ashkan_gc · Dec 29, 2009 at 11:53 AM

put 1.0/2.0 and then you will see the correct results. in javascript the variables are dynamic and their type can be changed. the problem is you are deviding 2 integer numbers. in C# you can use f as suffix "1f" to say the number is a float but i don't know can you do this in javascript or not. i am sure that if you use 1.0 and 2.0 it will give you 0.5 but i don't know it's a double or float. the problem surely is about number literals and is not about variable type because they are dynamic in javascript. hope this helps

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Joneson Oh · Dec 29, 2009 at 03:41 PM 0

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thanks for your answer, it helped!

Working with float variables in javascript

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