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node example. What is pointing? Is it a pointer, reference, value?

http://beastie.cs.ua.edu/cs150/book/index_16.html

I do not fully understand nodes

I am trying to debug code and look at pictures of pointing
but I can not understand how a variable is pointed to another location (value, reference)

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Anwar Saiah

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pepr

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rgb192

ASKER

aboo_s

is red pointing to value or reference or pointer of blue

pepr

This is what is called reference -- the reference value (the address) is used behind the scene to get to the target.

If a programming language makes the indirect access to the target object via its address visible, then we say we work with pointers. The target is also accessed indirectly,

is a pointer a reference pointing to a node

The [4, [3, [2, [1, None]]]] is actually something like:

is this a list, tuple

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pepr

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rgb192

ASKER

But those that do support references always require that the reference is always filled with value to some existing objects (i.e. some address). Pointers on the other hand can contain a special value named nil, NULL, nullptr or the like that says "pointing to nowhere".

so now I know one difference between pointer and reference

thanks