What exactly do pointers store? (C++)
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I know that pointers store the address of the value that they point to, but if you display the value of a pointer directly to the screen, you get a hexadecimal number. If the number is exactly what the pointer stores, then when saying
pA = pB; //both are pointers
you're copying the address. Then wouldn't there be a bigger overhead to using pointers when working with very small items like
A pointer is essentially just a number. It stores the address in RAM where the data is. The pointer itself is pretty small (probably the same size as an
int on 32 bit architectures,
long on 64 bit).
You are correct though that an
int * would not save any space when working with
ints. But that is not the point (no pun intended). Pointers are there so you can have references to things, not just use the things themselves.
Pointers in C Programming with examples, Unlike other variables that hold values of a certain type, pointer holds the address of a variable. For example, an integer variable holds (or you can say stores)� People often say that C is "near the hardware", pointer are one of those times it shows. The thing is that to store anything in a computer you have to put it at someplace in memory.
That is the locations in memory where other stuff is.
Pointers are generally the word size of the processor, so they can generally be moved around in a single instruction cycle. In short, they are fast.
Pointer Basics, A pointer is a variable that stores a memory address. Pointers Since the type of a "pointer-to-int" is (int *), we might ask, does this create three pointers? int* p, q, r Therefore, C treats pointers to different types AS different types themselves. A pointer is a variable that stores a memory address. used to store the addresses of other variables or memory items. Pointers are very useful for another type of parameter passing, usually referred to as Pass By Address. Pointers are essential for dynamic
As others have said, a pointer stores a memory address which is "just a number' but that is an abstraction. Depending on processor architecture it may be more than one number, for instance a base and offset that must be added to dereference the pointer. In this case the overhead is slightly higher than if the address is a single number.
Yes, there is overhead in accessing an int or a bool via a pointer vs. directly, where the processor can put the variable in a register. Pointers are usually used where the value of the indirection outweighs any overhead, i.e. traversing an array.
I've been referring to time overhead. Not sure if OP was more concerned space or time overhead.
Why C has Pointers, which stores the address of ' Variable1 ' in the pointer variable ' Pointer1 '. Arrays are very useful but C does not have array variables. one precedes its name in the function's parameter list with a ' & ' - exactly the same symbol as used to� A pointer is a variable that stores the address of another variable. Unlike other variables that hold values of a certain type, pointer holds the address of a variable. For example, an integer variable holds (or you can say stores) an integer value, however an integer pointer holds the address of a integer variable.
The number refers to its address in memory. The size of a pointer is typically the native size of the computer's architecture so there is no additional overhead compared to any other primitive type.
Pointers in C language with examples, Pointers in C language is a variable that stores/points the address of another Two pointers can be subtracted to know how many elements are available� Pointers are not integers. If you want to store a pointer value, you should almost always store it in a pointer object (variable). That's what pointer types are for. You can convert a pointer value to an integer using a cast, either a C-style cast: int foo; int addr = (int)&foo; or using a C++-style cast: int foo; int addr = reinterpret_cast
On some architectures there is an additional overhead of pointers to characters because the architecture only supports addressing words (32- or 64-bit values). A pointer to a character is therefore stored as a word address and an offset of the character within that word. De-referencing the pointer involves fetching the word and then shifting and masking it's value to extract the character.
Pointers in C Programming with Examples, How does Pointer Work? If we declare a variable v of type int, v will actually store a value. v is equal to zero now. However, each variable, apart� As just seen, a variable which stores the address of another variable is called a pointer. Pointers are said to "point to" the variable whose address they store. An interesting property of pointers is that they can be used to access the variable they point to directly. This is done by preceding the pointer name with the dereference operator (*). The operator itself can be read as "value pointed to by".
Pointers - C++ Tutorials, Pointers are said to "point to" the variable whose address they store. and, actually, an array can always be implicitly converted to the pointer of the proper type. The new thing in this example is variable c , which is a pointer to a pointer , and� The actual data type of the value of all pointers, whether integer, float, character, or otherwise, is the same, a long hexadecimal number that represents a memory address. The only difference between pointers of different data types is the data type of the variable or constant that the pointer points to. Using Pointers in C++
Pointer (computer programming), In computer science, a pointer is an object in many programming languages that stores a Thus in C, arrays can be thought of as pointers to consecutive areas of memory (with no gaps), and the syntax for the argument */ passByAddress(&x); // x was actually changed by the function and is now equal to 14 here return 0; }� Similarly in C, pointers are the variables, which store the memory address of another variable with data. It tells the user where a variable is stored. Below diagram shows this concept of pointers. We can see that we have variables var1, var2, var3, var4, ptr1, prt2, ptr3 and ptr4 stored in different memory addresses.
Pointer Basics in C, To find the address of a variable, C provides an operator called address In other words, a pointer variable ip can store the address of variables of type int only. Let's dig a little deeper to view how the compiler actually retrieves data.
- +1 because you are 14 :)
- Checkout the size of each object. Find out what is smaller than a pointer. sizeof(<object>)
- ya, indeed very good thinking for a teenager!
- In C++ there is a clear reference concept. The reason pointers exist is to be able to manage dynamically allocated memory, not references.
- @dribeas: I didn't mean C++ references, I meant the theoretical concept of having something that just tells you where to find something, so you can share the data.
- Pointers are there to save space and time as well. That's why we have copy-on-write.
- This is true for a single copy, but you can copy more than one bool or int within a single clock cycle (8x bools in an array is the same as copying a single pointer). Also, storing pointers in classes unnecessarily bloats their size and causes slower allocation speeds.
- On modern machines int's are typically 32-bit and points to variables are usually 64-bit. Basic data types like char have always been less than pointers in C/C++. So the OP's observation was right: don't try to use pointers/references to try to save time or memory if the data type is smaller than your pointers. It's a common rookie mistake.
- You didn't respond to the OP's question, and the OP said in the question that he already knew that.