Thanks! And I'll add the C++ FAQ Lite:
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Nice.
I see there is also: C++ FAQ
The few pages I checked appear identical between the two. :~
Another thing, if the code being posted is not properly indented, it is a pain to follow. Press "tools->auto format" in the IDE first as it makes it far easier to understand 
maniacbug:
Here's my contribution, a collection of common beginner trouble spots: 8 Common Programming Mistakes - Cprogramming.com
In section 5 of your link, it says that you have to declare the functions first. Why don't I have to do that in Arduino?
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Because the Arduino pre-preprocessing does it for you, most of the time.
Sometimes, like functions with references as parameters, it doesn't work too well.
AWOL:
Sometimes, like functions with references as parameters, it doesn't work too well.
I once did this:
void timer(unsigned long interval, void (*g)()){
//...
}
and got compiler errors unless I write the function before it is used.
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You may also point to this collection of libs: Arduino Playground - LibraryList
Post your code!
Please change that to "Post your complete sketch!" Too many people post snippets of code that have nothing to do with the actual problem.
Done. I added a clarification that a sketch is a program/code.