convert javascript double bitwise not to c#

Question

How to convert a double value with double bitwise not in c#. I have method javascript use double bitwise

var i= 0.0008590;
var j= 0.000002;
~~(i / j) * j
console.log(i );
/*
i=0.0008579999999999999
*/

@cwharris I don't think so, the title is promising but the contents of that QA are unrelated to this question — user555045
– user555045, Commented Jun 16, 2018 at 11:16

user555045 · Accepted Answer · 2018-06-16 11:15:21Z

1

The double complement in JavaScript is a trick to convert a value to a 32bit integer, with fractional values being truncated (not ceiling or floor, but rounded towards zero). C# has an explicit syntax for such a conversion: (int)value.

var i = 0.0008590;
var j = 0.000002;
var result = (int)(i / j) * j;
Console.WriteLine(result);

The result is approximately 0.000858

Or you could leave out the type conversion aspect and merely truncate:

var i = 0.0008590;
var j = 0.000002;
var result = Math.Truncate(i / j) * j;
Console.WriteLine(result);

An advantage is that it does not have funny behaviour for inputs that result in i / j being outside of the range of an integer.

answered Jun 16, 2018 at 11:15

user555045

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