difference between Classname* obj and classname obj in C++

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Hi,

I want to know the difference between:

C++

classname obj;
classname* obj;

How and when to use the above two?

Posted 15-Dec-10 18:31pm

tgpai

Updated 15-Dec-10 19:29pm

JF2015

v2

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4 solutions

Solution 1

Hi,

classname obj;

obj is and object of class classname, Where as in (classname* obj) obj is pointer to an object of class classname.

You can refer this article to know more.

http://msdn.microsoft.com/en-us/library/e1t5f7bs.aspx

[^]

Posted 15-Dec-10 18:42pm

vivekse

Solution 3

classname object;
classname* pointer_object;
object.member_function();
pointer_object->member_function();
pointer_object[0].member_function();
pointer_object[10].member_function(); // if pointer_object is an array of classname

Posted 15-Dec-10 20:44pm

Kozlov_Sergey

Updated 15-Dec-10 22:29pm

v2

Comments

[no name] 16-Dec-10 15:10pm

Also (*pointer_object).member_function();

[no name] 17-Dec-10 8:03am

pointer_object = new classname();

// ...

if(pointer_object!=NULL)
{
delete pointer_object;
}

pointer_object = new classname[100]();

// ...

if(pointer_object!=NULL)
{
delete []pointer_object;
}

Solution 4

First understand the concept of pointer and than click here for more information ->[^]

Posted 15-Dec-10 22:05pm

ShilpiP

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Rajesh R Subramanian · Accepted Answer · 2010-12-15T19:27:00

Solution 2

You don't seem to know what is a pointer, so I sincerely doubt any of the online forums are going to be useful to you.

Please read a good book on C. Once you understand the basics, online forums will be of great help to you.

Posted 15-Dec-10 19:27pm

Rajesh R Subramanian

Updated 15-Dec-10 19:28pm

v2

Comments

CPallini 16-Dec-10 3:36am

God call.

Dalek Dave 16-Dec-10 4:28am

Harsh but fair! :)

tgpai 17-Dec-10 3:32am

ok!! thanks.