De-Referencing Pointer in C Programming

De-Referencing Pointer in C Programming Language :

• Dot(.) indirection operator is used along with pointer variable
• Dot Operator is also called as value at operator
• When used with Pointer variable. It refers to variable being pointed to,this is called as De-referencing of Pointers
  

Pointer De-referencing :

• operation performed to access or manipulate data contained in memory location pointed to by a pointer
• Any Operation performed on the de-referenced pointer directly affects the value of variable it pointes to.

Demo Example : 

// Sample Code for De-referencing of Pointer
int n = 50 , x ;
int *ptr ;        // Un-initialized Pointer
ptr = &n;         // Stores address of n in ptr
x = *ptr;         // Put Value at ptr in x 

Evaluation :

// Sample Code for De-referencing of Pointer
*(ptr) = value at (ptr)         
       = value at (2001) //Address in ptr is nothing but address of n
       = 50  

Summary :

1. Name of Normal Variable always points to the Value  of variable
2. Pointer variable always Stores Address of variable
3. *ptr = n are one and the same
   

Variable	Value in it
n	50
&n	1002
ptr	1002
*ptr	50

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Tags / Keywords : | Pointer : De-Referencing Pointer

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