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Why does ~True result in -2?

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List all environment variables from the command line

Is it possible to list all environment variables from a Windows' command prompt? 8 Answers ...
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Android 'Unable to add window — token null is not for an application' exception

I get the following Android exception when I try to open a dialog. Can someone please help me understand what is going on and how can I fix this problem? ...
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Run/install/debug Android applications over Wi-Fi?

I thought there was a way to test your applications in development over Wi-Fi. Is this possible? 34 Answers ...
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IntelliJ: Working on multiple projects

We build in maven multiple projects (let's name them A,B,C). Project A uses .jar of project B which uses .jar of project C. ...
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Python regex find all overlapping matches?

I'm trying to find every 10 digit series of numbers within a larger series of numbers using re in Python 2.6. 3 Answers ...
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Bash, no-arguments warning, and case decisions

I am learning bash. 4 Answers 4 ...
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check if directory exists and delete in one command unix

Is it possible to check if a directory exists and delete if it does,in Unix using a single command? I have situation where I use ANT 'sshexec' task where I can run only a single command in the remote machine. And I need to check if directory exists and delete it... ...
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JavaScript is in array

Let's say I have this: 17 Answers 17 ...
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Rounding up to next power of 2

I want to write a function that returns the nearest next power of 2 number. For example if my input is 789, the output should be 1024. Is there any way of achieving this without using any loops but just using some bitwise operators? ...