Question

What is a pointer in C++ ? Give suitable example.

Answer 1

 1) “A pointer is a variable, which holds the memory address of other variable.”
2) * operator is used to declare pointer in C++. It takes the form as :

datatype * variable name ;

e.g.  int *ptr;
The above declaration will create a variable ptr, which is pointer variable and  which will point to a variable, whose data type is integer. 
3) The data type of ptr is not integer, but data type of variable which ptr will point is integer.
4) Advantage of using pointers are as follows :
i) It allows to pass variables, arrays, functions, strings, structures, objects as  function argu ments.
ii) It allows to return structured variables from functions.
iii) It supports dynamic allocation and deallocation of memory segments.
iv) By using pointers, variables can be swapped, without physically moving them.
v) It allows to establish linki between data elements or objects.