How to dereference a pointer ?

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Can anybody provide a example to understand the how to reference and dereference a pointer

Posted 17-Jan-13 22:17pm

mvigsnhwar

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CPallini · Accepted Answer · 2013-01-17T22:32:00

You dereference apointer when use the * operator to access pointed address value, e.g.

C

int a,b;
int * p; // this just declares p as pointer to integer

a = 5;

p = &a; // now p contains the address of the a

b = *p; // here you are dereferencing the pointer p

*p = 7; // here too you are dereferencing the pointer p

Anushkar · Accepted Answer · 2013-01-17T22:33:00

Solution 3

http://www.codingunit.com/cplusplus-tutorial-pointers-reference-and-dereference-operators[^]

Hope this article will help you..

Posted 17-Jan-13 22:33pm

Anushkar

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mvigsnhwar 18-Jan-13 5:21am

Thnk you Aushkar , CPallini , OriginalGriff for ur support

OriginalGriff · Accepted Answer · 2013-01-17T22:31:00

To reference and dereference a pointer basically mean "use the pointer".

You use a Reference operator when you want to assign a value to a pointer:

C++

int  i;
int* pi;

i = 666;
pi = &i;

Here, you declare an integer and a pointer to an integer, you assign a value to the integer, and then you use the reference operator "&" to get the address of the integer and assign it to the pointer.

You use a Dereference operator when you use the pointer to get the value it is pointing at:

C#

int  i, j;
int* pi;

i = 666;
pi = &i;
j = *pi;

Here we add another integer to the variables, then you use teh dereference opertaor "*" to fetch the value from where pi is pointing and assign it to j. At the end, i and j both contain the same value: 666

[edit]Typo "you you uthe" changed to "you use the" - OriginalGriff[/edit]

How to dereference a pointer ?

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