Pointer-3 Demonstrating Pointer through an example

Demonstrating Pointer through an example :

# include < stdio.h >
main ( )
{
 int a;
 int *p;

printf(" \n Enter the value for a " ) ;
scanf ( "%d", &a );

p=&a;

printf ( " \n a = %d ", a );
printf ( " \n Address of a is %u ", &a );
printf ( " \n using pointer a is %d ", *p );
printf ( " \n Address of a using pointer is %u ", p );
printf ( " \n Pointer p address is %u " , &p );
}

Diagram : Diagrammatic  representation of pointer

In the above program variable a is declared and assume that its value is 10. A pointer variable is also declared and holds the address of variable a (i.e. 1001). The output will be as follows,

a = 10  /* because a value is 10 */

Address of a is 1001 /* &a means address of a */

using pointer a is 10 /* *p => *(1001) => contents of 1001 is 10 */

Address of a using pointer is 1001 /* p contains 1001 i.e. equal to output of &a */

Pointer p address is 1008 /* &p means address of p */