Tagged Questions
1
vote
4answers
92 views
Returning arrays and pointers in C?
I'm relatively a beginner in programming in C and am getting super confused with arrays and pointers.
Basically what I'm trying to do is extend a string that contains binary to the designated length ...
3
votes
2answers
54 views
“no match for operator->* in pos ->* op”
I am getting the following error while compiling the below code. I am confused and am not able to figure out what is wrong here. Is the member function pointer de-referencing wrong?
Error:
#g++ ...
-4
votes
4answers
96 views
why can't I pass in variables to implement a swap function?
I just started learning C and I was confused about why do I have to use pointers to implement a swap function?
Version where swap does not work:
#include <stdio.h>
void swap(int i, int j) {
...
2
votes
3answers
67 views
Function Pointer Declaration - what does __P do?
The usual form of function pointer definitions is:
int function(int, int);
int (*ptr)(int, int);
but I saw a form today which I didn't understand. Can anyone explain this please?
int (*close) ...
0
votes
1answer
47 views
Returning a pointer is not working fine
When I try to display the content of an array via a pointer returned by a function, the program displays only zeros. I am not sure what is missing. I have tried to check several times what is wrong, ...
1
vote
1answer
39 views
CancelIoEx : Function pointer typedef
The following code is copied from MS Async Filter. It is supposed that the following code is calling either CancelIo or CancelIoEx. I don't see where CancelIoEx is called in anyway. It is supposed ...
0
votes
3answers
59 views
Float is printf wrong value
I have another float output issue printing "1.#R", I have narrowed it down to recurring values, so my question is how do I round the value to the 2 decimal places, so I can print the value (but not ...
0
votes
2answers
46 views
Returning pointers from function gives weird numbers
Iam trying to get the max number of this array that has numbers from -20 to 30 but it returns weird numbers like this --> 2255667 which is impossible if all is going well.
int * ptomx(int a[],int n)
...
0
votes
3answers
96 views
Function returning pointer to pointer
Please look at my code below:
class SVMClassifier : public LibHAR
{
public:
...
//This is my function returning a pointer to pointer to svm_node structure
svm_node** ...
-2
votes
1answer
53 views
Creating realloc array in C function and sending it to another
My code:
void calculations(int *data1, int *data2, int size1, int size2){
if (size1 != 0 && size2 != 0){
int *temp_data = NULL;
all_in_one(&temp_data, data1, data2, *size1, ...
0
votes
5answers
56 views
Change given function parameter within the function c++
I wrote an function called swap to swap given two elements within the function. But when I use it in another function, it doesn't work. How to get it work?
#include <iostream>
using namespace ...
-1
votes
2answers
26 views
Why the pointer to function gets value 0x00000000?
Why proc which is a function pointer gets null value?
EDITED:
0
votes
1answer
79 views
Filling array in C by using functions
Okay, so I am calling function fill_arrays like this:
fill_arrays(&data1, &data2, &size1, &size2);
fill_arrays looks like this:
void fill_arrays(int **data1, int **data2, int ...
0
votes
4answers
67 views
How to assign anything to array in this C function?
I have this C function:
fill_array(&data, &size);
void fill_array(int **data, int *size){
printf("Size is:");
scanf("%d", size);
*data = malloc(*size * sizeof(int *));
int i = 0;
...
1
vote
2answers
45 views
Calling functions using an array of pointers
I have the following files in my program, a header with certain function definitions, and a program with the body of the functions.
something.h
typedef struct _foo {
int id;
int lucky_number;
} ...
