反转数字的二进制值 [英] Inverting a binary value of a number

问题描述

我想先将数字转换为二进制，然后按位反转.像这样:

I would like first to convert a number to binary, then invert it bitwise. Like this:

数字是793 = 1100011001 然后将二进制值转换为: 0011100110

Number is 793 = 1100011001 then convert the binary value into: 0011100110

在JavaScript中，我可以执行以下操作:

In JavaScript I can do the following:

var x = 793;
document.write(x.toString(2)); // gives 0011100110

这将给我数字的二进制值.但是如何将二进制按位反转?

This will give me the binary value of the number. But how do I invert the binary bitwise?

我尝试了〜运算符，但可能无法正常工作.输出为: -1100011010

I tried the ~ operator, but not working probably. The output is: -1100011010

推荐答案

MooGoo的答案正确.

MooGoo's answer is correct.

以下是有关正在发生的事情的信息....让我们假设这是一个64位整数.

Here is some information about what is happening.... Lets assume this is a 64 bit integer.

793 = 1100011001
~793 = -794 = 1111111111111111111111111111111111111111111111111111110011100110
0x3ff = 1111111111
(-793 & 0x3ff) = 11100110

因此，您可以使用以下代码来解决所有情况:

So you could do this to solve for all cases with this code:

var x = 793; // input value
var y = x.toString(2);
var yl = y.length;
var mask = (Math.pow(2,yl)-1); // calculate mask
var result = ~x & mask;
document.write(result.toString(2)+"<br/>");

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