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What I’ve been up to?

via

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Swap without Temporary Variable

When we’re programming, if we want to swap values of two integer values, the “normal” way we do it would look like:

x = 5
y = 3
 
temp = x
x = y
y = temp

We need a temporary variable as a container to hold a value first then do the swap.
What if in some situation you can’t use [...]

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Solution to Lenovo Y410 Sound Problem On Ubuntu 8.04

Update 30/04: This script will only make speaker work, but not headphone. As Sam mentioned, there is another easy way to get sound work without installing anything: Suspend your machine and resume. The drawback is you have to do it every time after you (re)boot.
Well, this is another post about Ubuntu 8.04!
As I mentioned before, [...]

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Merry Christmas!

Hey, this is the first christmas for jaux.net, and today is my first boxing day to crash a door. Got nothing but happy holidays :)
Merry Christmas, everyone!

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How To Prevent Creating Objects On Heap

Yesterday I saw a C++ interview question that was asking the interviewees to prevent the clients from creating objects on heap. That is, you write a class and your class users can’t use new to create an object.
Here is my solution:

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class Foo
{
public:
Foo(const Foo& f) {}
static Foo getAnInstance()
[...]

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Search for next

This is a VIM tip. I saw it before, but I forgot it after a while. I saw it today, I don’t want lose it again, so I write it down.
When you are going though a document in VIM, you find a word and you want to go to the next same word in the [...]

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Solving Cyclic Dependencies Is Hard

I am a C/C++ beginner but I’d been already taught that dependency cycles are generally evil since it’s very hard to solve. I haven’t realized how hard the problem is before, because all the works I’ve done are “one file” programs or I can just simply throw all the files into a single gcc/g++ command.
However, [...]

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Peter’s Comment on Concurrency

“Concurrent program in a single processor computer will only make it slower than its sequential counterpart, but we are looking into the future, so let’s write concurrent programs.”
– Peter A. Buhr

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Autoboxing Makes Java Be 99% Object-Oriented

I remember that back to the early age when I was first beginning to learn the Java programming language, there was a famous quote (in China): Java is a 95% object-oriented programming language..
Why was it? Because Java has primitive types built-in. I have to admit that I both love primitive types and hate them. Loving [...]

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Circular Linked List Problem

How to determine a linked list has a cycle without marking any nodes? This is a classical interview question and one of my friend brought it to me.
When I came across the question, I thought that we might count the nodes. If the our counter goes behind the linked list’s size, we could say that [...]