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In C, what is the difference between using ++i and i++, and which should be used in the incrementation block of a for loop?
Even though the performance difference is negligible, and optimized out in many cases - please take note that it's still good practice to use ++i instead of i++. There's absolutely no reason not to, and if your software ever passes through a toolchain that doesn't optimize it out your software will be more efficient. Considering it is just as easy to type ++i as it is to type i++, there is really no excuse to not be using ++i in the first place.
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User kokos answered the wonderful Hidden Features of C# question by mentioning the using keyword. Can you elaborate on that? What are the uses of using?
The Using scope modifier is supported in the following contexts: Remotely executed commands, started with Invoke-Command using the ComputerName, HostName, SSHConnection or Session parameters (remote session) Background jobs, started with Start-Job (out-of-process session) Thread jobs, started via Start-ThreadJob or ForEach-Object -Parallel ...
Not using by means that the technology used is incidental, and the focus is on the approach being shown to be feasible. Without more context it's impossible to say what the intended import of the sentence is and whether by would actually be better or not.
By using a joystick or a pointing device, an on-screen keyboard allows people with mobility impairments to type data. The second sentence states that the on-screen keyboard is the one that uses the joystick or pointing device to allow impaired people to type data.