What is the useful of pointers and why it's existing​ only on c++??

Question

why we study pointers ??

Answer 1

Let's say I have a copy of a dictionary in memory.
Now I ask a function to find a word in that dictionary.

Do I :
- Send the entire dictionary to the function (which it has to finish retrieving before it can even start looking)
- Tell it where the dictionary is stored, so it can go look for itself?

Answer:
I point at where I've stored the dictionary.
It doesn't need its own copy.

You study pointers because there are various ways to point at things you don't want to copy.

Answer 2

There are pointers in Pascal too...

But basically it's more efficient to pass pointers to objects that have a lot of data in them, in a function, because only the memory address is copied, not the entire data contained in them.

Answer 3

its exists in C too.
Pointer allow to works with references instead of copy objects.

Answer 4

Pointers exist in assembler in some way.

But Object Oriented Programming is a modern aproach, and more usefull and robust for many many cases.

Use pointers only if:

1) you are a very very expert programmer in c language

2) your application REALLY needs to be fast