Questions tagged [pointers]
Data types for "pointing" at other values: A pointer's value is a memory address where the pointed-to value is stored. This tag should be used for questions involving the use of pointers, not references. Common programming languages using pointers are C, C++, Go, and assembly and intermediate-representation languages; use a specific language tag. Other helpful tags should describe what is being pointed-to (e.g. a function, a struct etc.)
pointers
56,798
questions
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answers
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Are pointer variables sometimes faster to initialize than reference variables?
Let's say just for acquiring the MEMORY-ADDRESS and VALUE of some variable. If the variable is "nested" in pointers like so:
int val = 10;
int *ptr1 = &val;
int *ptr2 = ptr1;
int *ptr3 =...
- 95
2
votes
3
answers
45
views
Why does this Linked List C function not work properly if previousNode->next is not set to NULL?
Node* deleteAtTail(Node* head)
{
if (head == NULL) /* If List is empty... */
{
return NULL;
}
else /* ...
- 29
2
votes
2
answers
64
views
Do brackets have effect during array of pointers declaration?
Recently I was reading "The C programming language" text book by Brain and Dennis and encountered that there is a difference between the pointer array definitions shown below:
int (*a)[10];
...
- 23
3
votes
0
answers
97
views
How do I pass a head-tail linked list to a function immutably?
If I need to pass a reference to an int immutably, I can pass it as a const int* to a function, as opposed to int*. This also helps the interface show that the pointed data won't be mutated.
Now I ...
- 31
0
votes
0
answers
14
views
Error while assigning a structure pointer member value
I got this error "error #28: expression must have a constant value" while trying to assign a pointer to structure member value to another as seen below
typedef struct {
int x;
int y;
}...
2
votes
2
answers
89
views
Circular linked list, destructor delete order causing seg-fault
Overview
I have a simple circularly linked list I was making for demonstration purposes (I know I should be using smart pointers, but this is a pedagogical exercise for memory and data structures).
...
- 21
2
votes
1
answer
21
views
Longest Repeating Substring With Replacement
Working on an online practice problem and ran into an issue that I can't seem to figure out. I am looking to find the longest length of a string of characters whose characters can only be replaced &...
- 45
0
votes
0
answers
34
views
Issue of readdir() reading the pointer to a directory
The basic logic in this problem is that the program scans over a directory for N times, and does some operation on specific file inside.
The bug comes out as: program employs rewinddir() to put the ...
- 1
1
vote
2
answers
65
views
Typedef for 2 dimensional array in C and acess over pointer
I create custom type for table (2 dimensional array):
typedef int table_t[4][2]; // 4 rows, 2 columns
Next, I declare table and pointer to the table:
table_t a = { {10, 0}, // my table
...
-9
votes
0
answers
102
views
Can a pointer point to a pointer? [closed]
I have doubt here, str has address of the character. Now, result is a pointer which is declared, and the variable 'str' holds the value "address of the character" , and how can a pointer ...
-3
votes
2
answers
48
views
Pass Function with Struct Parameter to a Struct in Go [duplicate]
Taking this example struct (my side):
type Route struct {
// other fields
Handler func(any)
}
This is what the example user of my code would look like:
type HelloWorldInput struct {
...
- 348
1
vote
0
answers
86
views
Problem with malloc and shared memory in C
I am trying to put shared_pid_data in shared memory. I need to have a dynamic array, so I use malloc, I also tried using calloc getting the same result. The problem I am encountering is that the data ...
- 201
-1
votes
1
answer
68
views
clang++ and g++ Compiler gives different output when printing char pointer [duplicate]
clang++ and g++ Compiler gives different output when printing char pointer
#include <iostream>
int
main(int argc, char** argv){
char a = 'a';
char* aptr = &a;
std::cout << aptr &...
- 1
1
vote
1
answer
75
views
C pointers: Function returns a pointer defined in its body [duplicate]
I'm learning C using the book C Programming: A Modern
Approach and I have some doubts about the use of pointers
and referencing an out-of-scope variables. I've put together three examples to
...
- 33
-1
votes
1
answer
59
views
Dereferencing pointers in a slice does not seem to yield the initial value that the pointer was created from [duplicate]
I need to make a slice of pointers for a Go project I'm working on, that references the items in a slice. The expected behavior would be that I could modify one of the dereferenced items in the slice ...
- 44