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 TechnicalTalk » Programming and Web Development » C/C++
 Pointers in C++

[researchpro]

researchpro  

 Pointers in C++

Well, besides pointers in C++ most of the java objects are similar to that of C++. Java programming doesnot have pointers. In C++, the two basic things of pointers are & referrence operator and * operators. It is related to the address or memory location to a variable.

[polas]

polas  

 Re: Pointers in C++

Java programming doesnot have pointers.

Arguably Java does have pointers - it is just the programmer is hidden from them somewhat and can not do interesting things such as pointer arithmetic. For instance, in Java

String mystring=new String("Hello");

The variable "mystring" points to the string object containing characters Hello, at a lower level of abstraction it points to the memory holding this string just like C++, you can even repoint this by mystring=new String("a new string"). The automatic garbage collector in Java will then recognise the original string is no longer being pointed to and hence of no use and will free the memory for some other usage.

[TrueDestroyer]

TrueDestroyer  

 Re: Pointers in C++

It's not arguably, Java does have pointers. I'm tired of people saying it doesn't. They're there. They're a pain because you can't touch them. It's misleading to say they aren't there, because almost every variable in Java is a pointer.

[polas]

polas  

 Re: Pointers in C++

It's not arguably, Java does have pointers

Depends on the programmer's level of abstraction

Almost every variable in Java is a pointer.

Apart from the primitives

[TrueDestroyer]

TrueDestroyer  

 Re: Pointers in C++

This is why I say almost.

The biggest annoyance to me in Java is the inability to overload operators. I want == to work for strings, I don't want to have to use .equals(). I think it's just something that I'm accustomed to being able to take advantage of and when I don't have it I feel like I'm being restricted.

[polas]

polas  

 Re: Pointers in C++

This is why I say almost.

I know

The biggest annoyance to me in Java is the inability to overload operators. I want == to work for strings, I don't want to have to use .equals(). I think it's just something that I'm accustomed to being able to take advantage of and when I don't have it I feel like I'm being restricted.

Yes I agree it would be very helpful (== checking pointer equality rather than value equality of objects has often confused the students I have taught a great deal) I can see how from a C++ background that would be a major want for the language. Personally, as  C programmer and being in that mindset, I often find myself writing Java and thinking "if only I could use pointer arithmetic I could save myself so much time, effort and the code would be very elegant"

Oh well, I suppose we can not have everything!

[josaphlewis]

josaphlewis  

 Re: Pointers in C++

Pointers to Member Functions are one of C++'s more rarely used method and are often not well unwritten even by experienced developers. A pointer is a variable that is used to store a memory address. The address is the position of the variable in the memory. Pointers help in distribute memory enthusiastically. Pointers improve completing time and saves space.  Pointer points to a particular data type. The general form of declaring pointer is:-
 type *variable_name;
 

[polas]

polas  

 Re: Pointers in C++

Function pointers also exist within C....

[maha66]

maha66  

 Re: Pointers in C++

Pointers do not have a default value in C/C++.  They are called wild! It means that they point to some unknown random location, and if it is for example an integer pointer (int*), it is not even guaranteed the the location pointed to by a pointer initially is occupied by an integer data.

[dennisacrown]

dennisacrown  

 Re: Pointers in C++

C + +, the pointer is a variable that stores the memory address.  Each store has an associated storage location address.  Pointer is a variable, which holds the address, also called a pointer variable.  C + + programmers are forced to work in the pointer, so they used a pointer to their code.

[alexsmth114]

alexsmth114  

 Re: Pointers in C++

Pretty useful post,, left me asking for more!!. .

[johnpitter]

johnpitter  

 Re: Pointers in C++

Yes, Pointer is a very powerful of the C++ language that has many uses in advanced programming. There are main two operator in pointer, Which are given below.

- Reference Operator(&).
- Dereference Operator(*).

[poster]

poster  

 Re: Pointers in C++

We could probably use a few more pointers that discuss more specific issues. Repetition is the key to learning. So long as the information is accurate, I have no problem with some redundancy.

[juanharris1]

juanharris1  

 Re: Pointers in C++

The variable "mystring" points to the string object containing characters Hello, at a lower level of abstract entity it points to the memory holding this string just like C++, you can even point this by mystring=new String

[sidharthbanyal]

sidharthbanyal  

 Re: Pointers in C++

Pointers are there in C# but they are not used because they can point to location which is out of CLR. same MAY BE CASE WITH jAVA

[randytaylor789]

randytaylor789  

 Re: Pointers in C++

Drinkable programming doesnot bang pointers.  In C++, the two commodity things of pointers are & referrence opportunist and * operators.  It is affine to the come or memory activity to a multivariate.

[jackeywilliam]

jackeywilliam  

 Re: Pointers in C++

Pointers are a part of C++ programming that can cause grief though not as much as in C, where to do anything non trivial you have to use pointers.  It is a capricious that is used to store a  memory address Pointers are not that bad, but if you are new to them they will could could cause you troubles.  It is all to simple to address bad code with pointers.

[mak14317]

mak14317  

 Re: Pointers in C++

A pointer is a variable that is used to store a memory address. The address is the location of the variable in the memory. Pointers help in allocating memory dynamically. Pointers improve execution time and saves space.  Pointer points to a particular data type. The general form of declaring pointer is:-

 

            type *variable_name;

[Radhaa]

Radhaa  

 Re: Pointers in C++

The following is a simple example of the use of pointers. . .

int &variable1Label = variable1;
    variable1Label = 101;
    cout << "The value of integer1 after assigning a value "
    << "to the label is now: " << variable1 << endl << endl;


I'm not really understanding it, though.  How does it actually work? I have referred to the tutorial on this site, but am still unsure.  

[msdnguide]

msdnguide  

 Re: Pointers in C++

every variable in java is a pointer