Bad Programming Practices

Each post must contain one bad programming practice to add to the list. I'll start:

In C++, overload library functions by using #define. That way it looks like you are using a familiar library function where in actuality you are using something totally different.

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Doing that increases the velocidensity of the sector of your hard drive where the file is stored, which in turn means that there will be less velocidensity available for your music files. If you use lossy compression you won't notice the difference, but your FLAC files will gradually lose information.