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By analogy, an electronic pointing device such as the TrackPoint used on ThinkPad notebook computers, and similar devices on computers from other manufacturers.

In computer science, a pointer is a programming language datatype whose value refers directly to ("points to") another value stored elsewhere in the computer memory using its address. Obtaining the value that a pointer refers to is called dereferencing the pointer. A pointer is a simple implementation of the general reference datatype (although it is quite different from the facility referred to as a reference in C++).

Pointers are so commonly used as references that sometimes people use the word "pointer" to refer to references in general; however, more properly it only applies to data structures whose interface explicitly allows it to be manipulated as a memory address. If you are seeking general information on a small piece of data used to find an object.

The pointing icon on a computer screen that users control with input devices such as computer mouse or joystick.

Pointer: A pointer is a programming language datatype whose value refers directly to another value stored elsewhere in the computer memory using its address.

A pointer is an object that contains the address of another object.

int a; /* an object of type integer */

int *pa; /* an object of type pointer to integer */

pa = &a; /* initialization of the pointer, pa now "points to" a */

pa; /* reference to the pointer's value */

*pa; /* reference to the object's value */

Arrays and pointers are closely related, but that is not within the scope of the question.

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โˆ™ 2010-04-18 17:16:13
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Q: What is a pointer?
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Related questions

What does pointer to pointer finger mean?

Pointer is simply a variable that stores the memory address of another variable. Pointer to pointer means double pointer ,pointer that points to another pointer variable.


What is dangling pointer?

dangling pointer is a pointer


What are different type of pointers?

Pointer is a variable that is used to store the memory address of another variable. There are differenr types of pointers: NULL pointer THIS pointer VOID pointer NEAR pointer HUGE pointer FAR pointer WILD pointer


C program pointers to pointers examples?

Pointer to Pointer is a double pointer, denoted by (**). Pointer stores the address of the variable and pointer to pointer stores the address of a pointer variable and syntax can be given as int **ptr2ptr;


Why you use double pointer instead of pointer?

Double pointers are better known as pointer-to-pointer types. You use pointers to store the memory address of an object but when the object is itself a pointer, you need to use a pointer-to-pointer in instead. Pointer-to-pointer types are typically used when passing pointers into functions. Pointers allow you to pass objects to functions by reference but the pointer itself is passed by value. If you want to pass the pointer by reference, you need to pass a pointer-to-pointer.


Difference between pointer to constant and constant pointer?

1. pointer to a constant means you can not change what the pointer points to 2. constant pointer means you can not change the pointer.


Pointer in c?

A Pointer is a Variable that holds a memory address, usually the location of another variable in memory. A pointer to pointer is known as double pointer.


What are pointer to pointer?

A pointer only holds an address information (location) in the memory. if a pointer holds points another pointer then it is a pointer to an other pointer. Pointer holds an address in the memory so in that address there is an other location information that shows another location.


What is pointer of pointer?

pointer is the variable that holds the address of another variable


Define pointer to pointer in c?

Double (**) is used to denote the double pointer. As we know the pointer stores the address of variable, Double pointer stores the address of any pointer variable. Declaration : int **ptr2Ptr;


What is void pointer and what are its uses?

Void pointer can hold the address of any kind of pointer. But we can't operate on void pointer


What is pointer and pointer types and uses of pointer and the meaning of pointer?

As the name suggests Pointer is used to point towards something ,here in this case it points to another variable and stored at a memory location. Pointer is a variable that stores address of another variable. Different Types of pointers are: 1)Dangling Pointers 2)NULL Pointers 3)This Pointer 4)Generic Pointer 5)Near Pointer 6)Far Pointer


Is a pointer and an English pointer the same?

Pointers come in different breeds. For example: German Short Haired Pointer and English Pointer.


What is Dazzling Pointer in c plus plus?

The pointer that points to a block of memory that does not exist is called a dazzling pointer or wild pointer


What is pointer why you use pointer?

Pointer is a variable that stores the address of another variable. Since pointer is also akind of variable, thus pointer itself will be stored at a different memory location.


What is pointer array?

an array of pointer


What a cell pointer?

A cell pointer is a


Which two pointer does not increment or decrement in arithmetic array?

constant pointer and character pointer


What is speedometer pointer?

a speedometer pointer is were there is a pointer were basically it points what speed your in whilst your driving


What actors and actresses appeared in The Pointer Sisters in Paris - 1985?

The cast of The Pointer Sisters in Paris - 1985 includes: June Pointer as herself Ruth Pointer as herself Anita Pointer as herself


What is triple pointer?

Example: int x; -- integer int *px= &x; -- pointer to integer int **ppx= &px; -- pointer to pointer to integer int ***pppx= &ppx; -- pointer to pointer to pointer to integer


What is dangling pointer reference?

Whenever memory that was in use, and was referred to by a pointer variable, is freed, and the pointer variable is not updated accordingly (setting it to NULL, for example), the pointer variable is considerred to be a dangling pointer reference.


Why would you use a pointer to pointer a in aprogram?

A pointer to pointer has many uses, one of the simplest being 2D arrays (matrices). Compacting garbage collectors also often employ pointer pointers.


How many pointer to pointer is available in C programming?

A pointer is a variable. Like any other variable, it consumes memory (4 bytes on a 32-bit system). So you can have as many pointers as you like, with as many levels of indirection as you like, the only limit being dictated by available memory (which can never exceed 4GB on a 32-bit system). Pointer-to-pointer variables are no different to pointer variables (and therefore have the same limitation as pointer variables), except that a pointer variable points to a non-pointer variable (such as int) whereas a pointer-to-pointer variable points to a pointer variable of the same type (which, in turn, points to a non-pointer variable of the same type). In other words, pointer-to-pointer variables add an extra level of indirection. You can also indirect pointer-to-pointer variables via pointer-to-pointer-to-pointer variables, and so on. Pointer indirection is useful because, without them, pointers would always be passed to functions by value (never by reference). Passing by value copies the pointer variable, which means you can mutate the memory it points to, but you cannot change where it points (because that would only affect the copy, not the original pointer that was passed). To pass a pointer by reference you must pass the pointer indirectly, via a pointer-to-pointer, which is itself passed by value. This allows the function to mutate the pointer variable (changing where it points), as well mutating the memory it points to. Indirect pointers are also useful when allocating dynamic multi-dimensional arrays because each additional dimension requires an additional level of indirection.


Your 305 has no timing pointer just the line on the balancer where do you mount the pointer you bought?

the pointer has its on mounting spot on the front of the block when you bolt it on the pointer will be set