Pointers

Pointer expression

Like other variables pointer variable can also be used in expressions. Arithmetic and comparison operation can be performed on the pointers.

Pointer Arithmetic

Example:

Addition of a number to a pointer int i=4,*j,*

j=&i

j=j+1;

j=j+9;

k=j+3;

Example:

Subtraction of number from a pointer int i=4,*j,*k;

j=&i

j=j-2;

j=j-5;

k=j-6;

But the following operation are not allowed on pointers:

a) multiplication of pointer with a constant

b) addition of two pointer

c) division of pointer with a constant

Pointer Comparison

Pointer can be compared using relational operator. Expression such as- p1>p2 p1=p2 p1!=p2 are allowed.