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0votes
3replies
96views
Restrict keyword and pointers to pointers
I'm in C and I have an int ** (2 dimensional array, it's basically a matrix, it's actually set up a little bit complicated but there's no internal aliasing, so it's not relevant).is this int** ...
- 1,674
0votes
3answers
216views
Realloc in function that deletes a row in a matrix
I have just encountered a case in this C program:void row_del(int**& a, int& row, int col, int k) { for (int j = 0; j < col; j++) { for (int i = k; i < row - 1; i++) { ...
- 17
3votes
4answers
150views
What's wrong with this code, which gets content (chars) from file and stores it in char**?
I have a small project (ed-like text editor for myself. Just want to edit some config files using it) and I have some problems with it. workspace_file->flc = malloc(sizeof(char *)); ...
- 39
1vote
3answers
235views
Deleting one node of single linked list use double pointers in C language
I have been reading something related to C language's double pointers, and I have some doubts about the following piece of code. The following piece of code is about the operation of deleting a node ...
0votes
3answers
131views
Accessing information on a 2d array with a double pointer in a struct (C)
In trying to understand pointers, I created a M[x][y] array, a pointer to said array *p_M[x] and a pointer to said pointer **d_p_M. The first pointer points to the first element of a row in the array ...
2votes
3answers
164views
Converting to char*** from char* [2][2]
I have the following variablechar* a[2][2] = {{"123", "456"}, {"234", "567"}};I wanted to refer it using another variable. While the cast works, accessing ...
0votes
0answers
65views
Why do we use a single pointer rather than a double pointer to pass an array to a function? [duplicate]
Why not double pointer to take an array?I'm having a bit of problem understanding why an array isn't passed as a double pointer (a pointer to a pointer) since the array name itself is a pointer (...
0votes
4answers
119views
char * gives garbage value when pointing to a variable of a function in C
When i pass a pointer to a function and then change the pointer to a another location of the memory, I get SIGSEV or garbage values. Where is a code to demonstrate that:#include <stdio.h>void ...
2votes
2answers
133views
why do I need to add an & sign while allocating a memory space inside a functions? [duplicate]
I wanted to try making an allocate function for a cell in a list, but when using it inside another functions, I need to add an "&" signI am aware of what "&" means in c (...
- 33
0votes
2answers
87views
"Magically" avoiding segfault
I wrote a small demo program#include <stdlib.h>#include <stdio.h>typedef struct tag_node { struct tag_node *left, *right, *prev; int value;} node;int main(){ node *...
- 185
1vote
0answers
82views
Marshalling double pointers in C#
I have to interact with a provided C library where one of the functions is declared as follows:int GetFileList(struct spiflash_file **ptr_spiflash_filelist, int **file_num);where **...
1vote
2answers
72views
Using realloc with pointer to pointer in another function
I'm trying to use realloc in this program to increase an array's size, using pointer to pointer. But it doesn't end up doing the task:#include <stdio.h>void push(int** data){ *data = (...
- 13
1vote
1answer
257views
Runtime error: `load of null pointer of type 'char'` when indexing an array
I'm trying to write a trim function, but when I try to use it the compiler is giving me a runtime error or load of null pointer of type 'char' when I try to run this code:// Trim trailing whitespace...
2votes
1answer
126views
Necessity of double pointer when using realloc to manipulate array
I am new to C++ programming and want to try out manual memory management (I am aware that it is advised not to use manual memory management, but I still want to give it a try).My goal was to write a ...
- 23
-3votes
2answers
129views
Confusion about C pointers
I am sending this message to clear my confusion that I could not manage and handle.The foo1 function code should work. I am giving the code details for you.When I run the code, the result is a ...
- 15
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