Pointer : Address Operator (&) in C Programming

Address Operator in C Programming

1. It is Denoted by ‘&’
2. When used as a prefix to a variable name ‘&’ operator gives the address of that variable.

Example :

&n  -  Gives address on n

Invalid Use of Address Operator

• We cannot use Address operator for Accessing Address of Literals.
• Only Variables have Address associated with them.

&75

• (a+b) will evaluate addition of Values present in variables.
• Output of (a+b) is nothing but Literal , so we cannot use Address operator

&(a+b)

• Again ‘a’ is Character Literal, so we cannot use Address operator.

&('a')

How Address Operator works ?

#include<stdio.h>
void main()
{
int a = 10;
printf("\nValue of n is : %d",n);
printf("\nValue of &n is : %u",&n);
}

Output :

Value of  n is : 10
Value of &n is : 1002

Visual Understanding :

After declaration memory map will be like this -

int i = 5;
int *ptr;

after Assigning the address of variable to pointer , i.e after the execution of this statement -

ptr = &i;

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