JD-Salinger

I realized i am having a hard time understanding what "const" means, to generalize what i Know, it means that using "const" means ull never change the value
for example

const int maxlen=30;

that simply means that maxlen cant be altered.(correct me if i am wrong)
but as i read more examples in the book and as i try the examples in the code and compiling it(there are some typos when i compile), there are errors in the const and i realize that most of it is when using const in a object

like

List const & list = _htab.Find (str, len);
or
const List x

etc.

DO you know any online tutorials out there that would make it clear to me?... thank you for your understanding

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