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dragneel · Apr 7 '12, 10:35 AM

I have this error.
"Invalid use of incomplete type struct Operand forward declaration of struct Operand". i got the same error some days ago, so i asked somewhere but the code was correct and i resolved creating again those files. But now i have again this error and i can't get rid of it :( I have this error in these 2 files.

barrel.h

Code:

#include "operand.h"
#include <string>
using

...

djspejbl · Feb 17 '12, 10:04 AM

Can't assign value to structure in array? this discussion was going on here some time ago without satisfactory conclussion at least from my point of view. here is my answer:
i have come cross a similar problem when having a struct representing id3 tag being part of node which was class instance .. later when i wanted to change value of that id3 tag; from the code eg.

Mp3Node node = treeView1.Activ eNode;
node.tag = new...

Cagin · Jun 16 '11, 10:38 AM

I define a macro like this:

Code:

#define L(p) ((p).value.len)

typedef struct node
{
	int dimension;
	int position;
	int size;

	union 
	{
	    long len;
	    float f;

	    } value;

	struct node *prev;
	struct node *next;

} node, *np;

and later,when I try to use that macro,
I have this error:
...

mahmoodn · May 25 '11, 04:02 PM

Hi
I have a struct

Code:

struct b_entry_t {
   uint32_t source;  
   uint32_t target;
   int counter;  
};

and I have created an instance of that

Code:

struct b_entry_t *entry;

Somewhere in my program I want to write it to file with fputs. The problem is how can I do that?

Code:

fputs (entry, pFile);

I get this warning

Code:

warning: passing argument 1 of ‘fputs’

...

Laura Wilkinson · May 8 '11, 12:36 PM

Hi all,

I am trying to use the variables I have in the struct to store user input about a car.

Code:

struct CarC
{
	string carRegistration;
	string carOwner;
	string carOwnerAddress;
	string carManufacturer;
	string carModel;
	unsigned numCarDoors;
	unsigned numCarSeats;
	string carType;
	string carInformation;
};

...

reubinoff · Dec 3 '10, 08:15 AM

hello,
I have some problem with my project in C. I want do define a generic type of matrix. with this type I can save any kind of type(int, double, float...). but I have some errors in my code. if someone can help me I'll be very gratefull. the code is:

Code:

typedef struct arr{
	void * p_arr;
}arr;

typedef struct matrix{
	
	arr  * p_mat;
	char* name;
	int size_h;
	int

...

robintux · Jun 17 '10, 02:03 PM

i'm writing a header , from define a struct.

The question is , how declare this struct in my main.c .

function.c

Code:

 struct data{
       size_t n;
       gsl_vector  *y;
     };

function.h

Code:

/*here should be the struc data*/
?????

main.c

Code:

#include "function.h"
	struct data d = { n, y 	};

Errors...

EnlightenedOne · May 22 '10, 03:12 PM

Hey there I have a data structure with a set size of 40 I want to marshall the data from an object into an array of characters for simplistic transmission of data. I am aware of serialization but only familiar with it in higher languages, I am stuck using c.

My question is this. How do I point to an individual character value of the unmarshalled object in order to marshall it into a character array I can throw down the socket pipe?...

superhero · May 16 '10, 11:45 AM

Hi guys,
i'm writing a simple code which is about polynomials using link lists in C#. the problem i have is that whenever it creates a new struct (node) in the for loop it gives it the same address as the previous node was given. so how do i fix it ? here is my struct :

struct poly { public int coef; public int pow; public poly* link;} ;

and here is the where the problem occurs:

for (;...

miner · May 7 '10, 12:59 PM

Hi all

I'm doing my first steps in C and I need some help plz.

I have 2 structs, a node* and a stack*. I want to write a push() function that accepts to arguments, the node to insert and the pointer to the the top of the stack.

This way it works without problems: push(node *theNode, stack *theStack)
The call looks like that: push(newNode, newStack) and inside the function I can access the pointer...

EARNEST · Mar 30 '10, 05:17 PM

Code:

#include <string.h>
#include <ncurses.h>
#include <time.h>
#include <stdlib.h>

typedef struct builder{
	int locX;
	int locY;
	char charValue_H;
	char charValue_T;
	char *charArray_B;
} sbuilder;

void drawborders();
void initialize(sbuilder *stopass);
bool collisiondetection();

int main()
{

...

Rafael Justo · Mar 12 '10, 01:35 PM

When I try to write a specific byte (letter 'p') in a writable buffer using pack_into the result is a corrupted data:

Code:

>>> from ctypes import create_string_buffer
>>> from struct import pack_into
>>> test = create_string_buffer(1)
>>> pack_into("B", test, 0, 48)
>>> print repr(test.raw)
'0'

The answer should be '\x30'....

mike91 · Mar 2 '10, 03:18 PM

Hello,
I have a text file of unknown size that I need to read into a struct array where the struct looks like :
{
short hours
float secondsPastHour
float data1
float data2
}

But the text file is in the format
hh:mm:ss data1 data2

I have an array of the struct and I need each line in the text file to be read into one record of the array. I know how to...

DOSASIS09 · Feb 4 '10, 08:32 AM

Hello, im not an inexpert guy programming and I need to do an application in c, that I declare using a structure 3or4 structures predefined. After that I need to sort this 3 or 4 strucutres “tasks” depends on the parameter of the priority in each structure. I would like to read the structures and then do a sort list with the ID of the task, but depending on the PRIORITY of each task. I don’t know how many pointers I should use.I understand...

kiser89 · Dec 7 '09, 01:21 AM

I'm having a problem with my array of structs and segmentation faults. I have this struct that represents one line of a source file:

Code:

struct threeTokens {
int lineNumber;
char* cmd;
char* param;
}; line;

This is the code that tries to fill the array of structs, which is a global variable called program:

Code:

program = malloc(numLines * sizeof(line));
        while(NULL != fgets(buffer, SIZE, fp)){

...

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