Why it is leaving the decimals

Question

Possible Duplicate:
What is the “double tilde” (~~) operator in JavaScript?

My Code:

<SCRIPT type="text/javascript"> 

var num = 2.52;
alert(~~num);

</SCRIPT>

It is giving the result as 2. Why it is leaving the decimals? Any Ideas.

What else did you expect from an integer? – Bergi Dec 07 '12 at 14:01 — Bergi, Dec 07 '12 at 14:01
The double not (`~~`) bitwise operator will floor a value. – Chad Dec 07 '12 at 14:02 — Chad, Dec 07 '12 at 14:02

score 1 · Accepted Answer · answered Dec 07 '12 at 14:04

1

Here is an explanation http://james.padolsey.com/javascript/double-bitwise-not/

The bitwise NOT operator (~) will take its operand, convert it to a 32-bit integer, and will invert each bit so that each 0 becomes a 1 and vice versa.

answered Dec 07 '12 at 14:04

Jonathan de M.

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score 0 · Answer 2 · answered Dec 07 '12 at 14:03

0

I found this helpful resource:

http://www.joezimjs.com/javascript/great-mystery-of-the-tilde/

Léon

answered Dec 07 '12 at 14:03

leonvv

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score 0 · Answer 3 · answered Dec 07 '12 at 14:03

0

Every bitwise operation in JavaScript does convert its arguments to signed 32bit intergers. This will strip of your decimals. Else, you might expect the double bitwise NOT to yield its argument unchanged.

answered Dec 07 '12 at 14:03

Bergi

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score 0 · Answer 4 · answered Dec 07 '12 at 14:05

0

Simply remove the tildes (~).

<SCRIPT type="text/javascript"> 

var num = 2.52;
alert(num);

</SCRIPT>

answered Dec 07 '12 at 14:05

ᴍᴀᴛᴛ ʙᴀᴋᴇʀ

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Why it is leaving the decimals

4 Answers4