non-static vs. static function and variable

Question

I have one question about static and non-static function and variable.

1) non-static function access static variable.

It\'s OK!

class Bar
{
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Answer 1

It's not ok. Static functions are accessible without having an instance of a class and thus can't access information that you would need an instance to determine.

For example, you don't need a car to know how many wheels it has, blueprints for a general car would suffice (that could be static information) but you can't tell what color the car is unless you're referring to a specific car (that information needs a specific instance of an object.)