Contents
Can pointer point to itself?
Yes, a pointer can contain the position of a pointer to itself; even a long can contain the position of a pointer to itself.
Can we use pointers in recursion?
These pointer re- cursive functions classes are equivalent to the usual partial/primitive recursive functions. Tropical tiering and pointer recursion, used with some of the most common recursion schemes, capture the classes logspace, logspace/polylogtime, ptime, and NC.
Do pointers have their own memory address?
When you create a pointer to that variable, the pointer is stored in its own memory location. It is the compiler’s job to know where to “get the pointer.” When your source code refers to the pointer ‘a’, the compiler translates it into -> “whatever address value is stored in memory location 874”.
Can pointers point to stack?
pointers point to any memory where an object or function can appear: stack, static, heap, code, mapped, shared, whatever.
Can pointers have same name?
the question: can the code have a variable and a pointer with the same name? If they were each local to different functions (or different files) then they are in different ‘scopes’ then, YES then can have the same name. What you have is a variable names pointer whose type is int * , i.e. a pointer to an int .
Why pointer is difficult?
The reason it was complicated was because I didn’t understand that a pointer was an address to something. If you explain that it is an address, that it is something that contains an address to something else, and that you can manipulate that address to do useful things, I think it might clear up the confusion.
When would you use a stack pointer?
The Stack Pointer (SP) register is used to indicate the location of the last item put onto the stack. When you PUT something ONTO the stack (PUSH onto the stack), the SP is decremented before the item is placed on the stack.
Is heap a stack?
JVM has divided memory space between two parts one is Stack and another one is Heap space. Stack space is mainly used for storing order of method execution and local variables. Stack always stored blocks in LIFO order whereas heap memory used dynamic allocation for allocating and deallocating memory blocks.
What is so difficult about pointers / recursion?
In general, pointers require a different mental model than pure variable assignment. When I have a pointer variable, it is just that: a pointer to another object, the only data it contains is the memory address that it points to.
Why are there so many problems with recursive functions?
The difficulty with recursive functions happens when people without enough mathematical background (where recursiveness is common and required knowledge) try to approach them thinking that the function will behave differently depending on how many times it has been called before.
How are pointers manipulated in a programming language?
Some programming languages allow the manipulation of pointers as integers, and that means that pointers can point anywhere (including the most unexpected places when a bug is present). To use pointer arithmetic correctly, a programmer must be aware of the memory sizes of the objects pointed to, and that’s something more to think about.
What are some of the problems with pointers?
There are several difficulties with pointers: Aliasing The possibility of changing the value of an object using different names/variables. Non-locality The possibility of changing an objects value in a context different from the one in which it is declared (this also happens with arguments passed by reference).