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Pointer in c language.

 

What is Pointer ?

Pointer is a address variable that hold the address of another variable.The * (indirection or dereference operator), that  gives the contents of an object that pointed to by a pointer.

To declare a pointer to a variable:

data_type_name * variable name 
int *ptr;

Example 1:

void main( )
{
       int a = 10 ;
       printf ( "\nAddress of a = %u", &a );
       printf ( "\nValue of a = %d", a );
}
Output:
address of a=1565
value of a=10

Example 2:

void main()
{
  int a = 5 ;
  printf ( "\nAddress of a = %u", &a );
  printf ( "\nValue of a = %d", a ) ;
  printf ( "\nValue of a = %d", *( &a ) );
}

Output:

Address of a = 1444
Value of a = 5
Value of a = 5
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