Page 99 - 6437

otherwise, is the same, a long hexadecimal number that represents a memory address. The only
difference between pointers of different data types is the data type of the variable or constant that
the pointer points to.

How to Use Pointers?
There are a few important operations, which we will do with the help of pointers very
frequently. (a) We define a pointer variable, (b) assign the address of a variable to a pointer, and
(c) finally access the value at the address available in the pointer variable. This is done by using
unary operator * that returns the value of the variable located at the address specified by its
operand. The following example makes use of these operations:

#include <stdio.h>

int main ()

{
int var = 20; /* actual variable declaration */

int *ip; /* pointer variable declaration */

ip = &var; /* store address of var in pointer variable*/

printf("Address of var variable: %x\n", &var );

/* address stored in pointer variable */
printf("Address stored in ip variable: %x\n", ip );

10
2