OPERATORS IN POINTERS

Pointer operators

There are two types of pointer operators in 'C'. Those are

1. Address operator(&):

·         To store the address of a variable into pointer variable

·         Control string is used to display the address as output is eiether %u or %p

%u --> Decimal format as output

%p --> Hexadecimal format as output

2. value at(*):

·         It is a special operator called indirect operator

·         It is used to access the value of the variable by using pointer

Accessing variable value through pointer:              

The value of a variable can be accessed through pointer variable using a unary operator ‘*’, usually known as indirection operator.  The operator refers to “value at the address in”.

Example:        *ptr    refers to value at the address in ptr

/* EXAMPLE PROGRAM TO DEMONSTRATE POINTERS CONCEPT */

main()

{

            int x,*ptr;

            clrscr();

            printf("\nAddress of x is:%u",&x);

            printf("\nAddress of ptr is:%u",&ptr);

            x=10;

            printf("\nx value using x:%d",x);

            ptr=&x;

            printf("\nValue in p:%u",ptr);

            printf("\nx value using ptr:%d",*ptr);

}