[jingoria]

Please clarify my understanding of pointers.

 
string *word; // a pointer declaration

word = &word2rep; //now if my pointer is pointing to address of a variable which stores the word i read from a sentence then..

word = newword; // since the pointer variable(word) is pointing to an address now I [u]want to store a newword at the same address[/u]. Is this right?

Pls read the comments to see what I am trying to do. Basically I have a pointer pointing to an address of a word stored in a sentence and then using that address I am trying to store a new word at that same address.

Thanks.

[KYA]

Few things:

word points at the address, but the contents of the pointer is the memory address itself. If you want to assign a value at the location the pointer points to you do this:

*pointer =  value;

What you have now could result in a few different things (in regards to step 3), for example you could be reassigning the pointer's memory address rather then changing the value at the memory address.

[sparkart]

int var = 10;

//Initialize pointer.
int* ptr;

//Make ptr point to something.
ptr = &var;

//Pointer points to var and equals 10.

//Get what it points to and change the value.
*ptr = 100;

//Pointer points to var.
//Pointer changes the value of what it points to (10)
//and changes it to 100.

//Now var equals 100.

Remember that int* is of type "pointer of an int". So you cannot do:

int integer;
int* ptr = integer;

This post has been edited by e_barroga: 10 September 2009 - 09:04 PM

[Codiak]

e_barroga, on 10 Sep, 2009 - 07:57 PM, said:

int var = 10;

//Initialize pointer.
int* ptr;

//Make ptr point to something.
ptr = &var;

//Pointer points to var and equals 10.

//Get what it points to and change the value.
*ptr = 100;

//Pointer points to var.
//Pointer changes the value of what it points to (10)
//and changes it to 100.

//Now var equals 100.

Remember that int* is of type "pointer of an int". So you cannot do:

int integer;
int* ptr = integer;

Hell of a useful post man! Just nailed it on the head for me. Was just revisiting pointers myself and checking my understanding. Thanks dude.

[sparkart]

Glad that you found my post helpful!