Page 24 - PROGRAMMING IN C_Neat

UNIT IV

1. Explain how pointers are declared and initialized. OR Write about pointers in detail. ***

Pointers:
 Pointer – a variable that contains the address of another variable.
 Example:
int a;
a = 6;
int *p;
p = &a;

 Variable Declaration:
int a;

Memory Storage:
a Variable Name

1001 Variable Address
 Variable Initialization:
a = 6;

Memory Storage:
a Variable Name

6 Value

1001 Variable Address
 Address of Variable:
&a
where,
& - address operator
&a  1001 (address of a)
 Pointer Variable Declaration:
int *p;
 * is placed before the pointer variable.

Memory Storage:
a Variable Name

6 Value

1001 Variable Address

p Pointer Variable Name

2001 Pointer Variable Address
 Pointer Variable Initialization:
p = &a;
 Address of variable, a is assigned to pointer variable, p.