C++ :: How 3 Pointers Have A Link In Memory
Sep 2, 2014declare
int *p[3];
that gives an array with 3 pointers, but how 3 pointers can have a link in the memory?
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C++ :: Pointers Point To Address In Memory
Sep 30, 2013Pointers point to an address in memory. What if I used 3 pointers: 2 to mark the first/last nodes, and the third to mark the current node being referenced? I would wrap it in a class (to make the memory management automatic, of course), but is this practical?? maybe some pseudo code will get the juices flowing:
template<class type>
class supercondensed_list{
public:
supercondensed_list();
~supercondensed_list();
[code].....
Any things I should take into consideration? I'm not exactly the most experienced with pointers, and manually managing memory, but I think it's worth trying. If this works, then my programs should, in theory, be 100% memory efficient.
C++ :: Memory Addresses Of Pointers To Structs
Apr 19, 2014I have this struct declaration to create a linked list
struct node {
string y;
node* next;
};
If I create a linked list of 3 nodes
A->B->C->NULL
A->y is "a"
B->y is "b"
C->y is "c"
Since they are consecutive in memory. How far apart are the strings in memory?
I tried doing something like
int n = &(head->next->x)-&(head->x);
The problem is that I got 6 while debugging and 2 otherwise.
C :: Double Pointers And Dynamic Memory Allocation?
Nov 16, 2013we are currently covering double pointers and memory allocation. Currently getScrabbleWords is not working. when I compile with commented code (Main() works fine) I get a segmentation fault.
This is the purpose of getScrabbleWords:
char **getScrabbleWords(char **allWords, char letters[]):
This function takes an array of char* values (i.e. strings) representing all the words read from wordlist.txt. Each of these words is tested by callingcanWeMakeIt as a helper function, and pointers to the words that can be made are put into an array, myWords. Note, copies of the words are not made! In order to indicate the end of myWords, we terminate with a NULL pointer. Thus, if N words can be made from letters then myWords should have length N+1.
C++ :: Initializing Pointers To Memory Addresses Or Values?
Aug 31, 2014What is the difference between initializing pointers to a memory address using the address operator like int *pointer = &x; or initializing it to a value like int *pointer = x; .. in other words how does p and q point to the same memory address in:
const int ARRAY_LEN = 100;
int arr [ ARRAY_LEN ];
int *p = arr;
int *q = &arr[0];
C++ :: Pointers And Images - Memory Access Violation
Nov 20, 2014I get a memory access violation when I run the below code. void createNewImage(int width, int height); this function deletes any current image data and creates a new image with the specified width/height and allocates the needed number of pixels dynamically. The new image contains four blocks with different color, red, blue, green, and black.
Code:
#include <iostream>
#include "image.h"
image::image() {
pixels = NULL;
width = 0;
height = 0;
[Code] .....
C :: Dynamic Memory Allocation - Resize Array Of Pointers
May 23, 2013Suppose I wished to reallocate memory (resize) an array of pointers. Why does the following not work?(The program runs, yet yields a faulty segmentation error message. Why?):
Code: char **ptrarr = (char**) malloc(sizeof(char*))
Code: ptrarr = (char**) realloc(ptrarr, (capacity) * sizeof(char*));
C++ :: How To Use Dynamic Memory Allocation And Pointers To Iterate Through The Arrays
Dec 21, 2014I need to use dynamic memory allocation and use pointers to iterate through the arrays that I have already in this program. I am lost, nothing I do works and where to use the pointers. I am just looking for a push in the right direction so I can finish this project and how I can implement pointers in my program.
#include <iostream>
#include <string>
#include <cstdlib>
#include <iomanip>
#include <stdio.h>
using namespace std;
[Code]...
C++ :: Correct Values Passed To The Pointers - Memory Corruption
Apr 26, 2012My project is say that it has memory leaks. When I view it in the debugger, it shows the correct values being passed to the pointers.
Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
bool ConfigGetEntry( char *pcFile, char *pcNameMust, char* &pcResult ) {
char pcBuffer[ 512 ];
[Code] ....
Its saying that i have memory corrupting at..
Code:
if ( !ConfigGetEntry( pcFile, pcName, pcRet ) ) return _strdup( pcDefault );
Also is it normal to have a bad pointer then point data into it to then clear that of the bad pointer. To have valid data now in that pointer.
C :: Free Memory From A Dynamically Allocated Array Of Pointers To Linked Lists
Feb 26, 2013Having some frustrating issues trying to free memory from a dynamically allocated array of pointers to linked lists. I think the problem is in how I initialize the pointers to NULL. Is there a more elegant way to have the program recognize that the list is empty so it knows to create a head node for the linked list in the function 'add_end_stub_to_array'?
I ran the code through Valgrind and it says that memory is definitely lost from this array.
This is the structure definition.
Code: struct stub_edge {
int loc_id;
int anim_type;
int mkt;
struct stub_edge *next_node;
};
Here is the code snippet from main allocating and deallocating memory to the array.
Code:
struct stub_edge **stub_list = (struct stub_edge **)malloc( sizeof(struct stub_edge *) * 12);
for (i = 0; i < 12; i++)
{
stub_list[i] = (struct stub_edge *)malloc(sizeof(struct stub_edge));
stub_list[i] = NULL;
}
stub_list = add_end_stub_to_array(end_stubs, stub_list);
destroy_end_stub_array(stub_list);
Here the function for adding nodes to the lists by reading through a dynamically allocated 2D array. (The end_stubs array is ordered by month and each linked list represents events occuring within the month).
Code:
struct stub_edge **add_end_stub_to_array(int **end_stubs, struct stub_edge **list)
{
long int i = 0;
int mon = 0;
struct stub_edge *current_node1;
struct stub_edge *new_node1;
int break1 = 0;
while(i < num_edges && break1 == 0 && mon < 12)
[Code]...
Here is the function for freeing memory from the list.
Code:
void destroy_end_stub_array(struct stub_edge **list)
{
if(list != NULL)
{
int mon = 0;
struct stub_edge *current_node1;
struct stub_edge *new_node1;
for(mon = 0; mon < 12; mon++)
[Code]...
C :: Cannot Get Programs To Link
Mar 23, 2013I've copied and pasted my code. The main program, the calculateTaxes.cpp function code and my makefile. I am using the makefile to link these two codes together but I get an error when I type 'make' in the command line.
I receive the error code:
assign2c.cpp.text+0x169): undefined reference to 'calculateTaxes(float, float, float*, float*, float*)'
collect: ld returned 1 exit status
make: *** [main.exe] error 1
[Code]......
C :: How To Link One File With The Other
Dec 10, 2014I am new to programming for starters. The problem I am having is linking a sub .c file to my main.c I am assuming I will need to use #include <insert_sub_file.h> correct?
View 4 Replies View RelatedC++ :: How To Link An Object To Another One
Jun 27, 2013I have the following problem, I have an object of a class Subject, and I want that this object points to another object of class Classes, creating a kind of link. How can I do that?
View 4 Replies View RelatedC++ :: Link The Strings To The Integers?
Nov 8, 2014Code:
#include <iostream>
#include <string>
using namespace std;
int main()
[Code] ......
How do I link the strings to the integers?
C++ :: How To Link A Switch Statement To A If / Else
Aug 8, 2014The sample output of this program would be:
Please select:
1 - Year
2 - Day
3 - Month
Input choice: 1
Input Number: 2
I'm a Sophomore!
Please select:
1 - Year
2 - Day
3 - Month
Input choice: 2
Input Number: 2
It's Tuesday.
Please select:
1 - Year
2 - Day
3 - Month
Input choice: 3
Input Number: 2
February. Heart's month!
Here is my code, I only typed the Year(levels) yet because when I tried to input 2(day) and 3(month) for the Input choice and after that, Inputting a number to 1-4 would yield the same result to case 1's year levels.
#include <stdio.h>
#include <conio.h>
using namespace std;
[Code].....
how to link the case 2 to days and case 3 to months?
C++ :: How To Dynamically Link Library
Jan 3, 2014I've recently integrated a scripting functionality into my game engine (squirrel), but I can't figure out how to dynamically link the library.I have to dynamically link some libraries for licencing sake, but I'm forced to statically link Squirrel. How can I statically link Squirrel, but dynamically link the others?
View 8 Replies View RelatedC++ :: How To Link Static Library
Mar 31, 2013How to create standalone program. For now I have simple program connecting to MySql Database and when i run it, shows me error, libmysql.dll is missing... When i put libmysql.dll in same folder works. Now my question is, how in code blocks can i compile so i won't require libmysql.dll anymore and be able to use it on any machine.
View 1 Replies View RelatedC# :: How To Get (DLL Files) For The Link Grammar
Nov 29, 2014Actually I find the version C# ( Link-grammar 5.1.3) and when I opened Msvc12, I found three projects, in my research I need to include the link grammar in my own C# project, but I would like to request how I can get the (.dll files) for the Link grammar project and include it on my project.
View 3 Replies View RelatedC# :: Link Combobox With SQL Column
Oct 19, 2014When I try to link combobox with sql column i get error !!
void comfunction() {
string constring = "Data Source=LC-VAIO\SQLEXPRESS;Initial Catalog=sample1;Integrated Security=True";
string query = "select * from tbltest";
SqlConnection cn = new SqlConnection(constring);
SqlCommand cmd = new SqlCommand(query,cn);
SqlDataReader dreader;
[Code] ....
I got error from "string sname = dreader.GetString("name"); "
And this how i try to link it...
C/C++ :: How To Link Elements Of Array
Mar 15, 2012I am trying to take the Array v[]={0,1,2,3,4,5,6,7,8,9} and put some of the numbers together so I can create a math problem. I have used next_permutation to get the possible combinations of the numbers. I am trying to check every combination to see if they work. Like v[1]v[2]v[4]v[0]v[3] to get then number 12403 (that is where I am having the problem) that I can subtract from v[7]v[2]v[0]v[1]= 7201 to get the answer 5202. How can you put v[1]v[2]v[4]v[0]v[3] together to get the number 12403?
View 1 Replies View RelatedC++ :: Link Error Although All Constructors Appear To Be There
Feb 16, 2015I'm getting a massive 1300 char link error with VC10. It appears to complain that it can't see the constructor although the constructor is definitely there.
Error:
test_GatewayNS.obj : error LNK2019: unresolved external symbol "public: void __thiscall std::allocator<class BinarySearchVector::ElementTemplate<class Gateway,unsigned __int64> *>::construct(class BinarySearchVector::ElementTemplate<class Gateway,unsigned __int64> * *,class BinarySearchVector::ElementTemplate<class Gateway,unsigned __int64> * const &)"
[Code] ....
However, the constructors seem to be there and if I copy them into my program just to make sure - the compiler complains that they are already defined:
namespace BinarySearchVector {
template <class ElementType, class IdType> class ElementTemplate //allows comparison functions to be redefined {
public:
ElementTemplate(IdType myId) : id(myId), tickCount(0), requestingDeletion(false) {};
[Code] ....
Any clues as to what I'm missing ?
C++ :: How To Put Time In Enqueue Link List
Mar 6, 2013how to enqueue time. An example is Code: pqueue.enqueue("Name", 11:00); But it will read an error because the ( : ) is there. So how can I do it so that I can output time.
Desired outpout:
Name 11:00
C/C++ :: How To Link External Library In Application
May 4, 2012How can I use one external library in my C++ program?
View 3 Replies View RelatedC++ :: MinGW And Export Link Libs?
Jan 5, 2012I'm building an app using VC++. The app links to a DLL built using TDM-GCC (which uses MinGW I think). Obviously, the DLL comes with a link lib.
If the lib is linked to another MinGW app, the DLL functions get found by name. So if the DLL builder updates his DLL, the MinGW app carries on working.
However, if the same lib is linked to a VC++ app, the functions get found by ordinal value. But MinGW doesn't seem to have any means of guaranteeing that a later build of the DLL will use the same numbering scheme. So his new DLL will break the pre-existing VC++ app that used it.
In VC++ this problem could be solved by using a DEF file but that doesn't seem to work in MinGW. So my question is:- can a DLL built with MinGW be somehow instructed to export its functions only by name - or at least to export them so that any other compiler will import them by name and not by ordinal numbers?
C++ :: Link Between (STL) Container And (Fstream) File I/O?
Nov 9, 2012I did some of the projects using STL container and it is pretty much efficient to retrieve the data's information quickly (i.e. sets, sets & maps). I read many C++ OOP book and none of them make me clear about the Link Between (STL) Container and (Fstream) File I/O. Can they link together ?
I am going to design a small Library Book Management Project. I am planning to develop it using the STL Algorithms & containers. Objective of this project is to keeping the records of books issued and deposited by students in a particular date. User will be given a facility to retrieve student's information, book information and he/she can modify/update specific book's, student's information by changing issue date, deposited date, Book's publication etc.
My intention is to create a File I/O where user can input & update/modify daily transaction inside the file called (xx.dat) file in project directory. Is it possible to create 'set' container inside the file (xx.dat) ? Or, It's impossible ? Or, do i have to do this in other way?
C :: Read Link List Data From File
May 7, 2013i write this program and every things work correct except when i want to add data of file to the link list .when i add the data to the link list by add_to_linked_list() every things work correct but when i use read_linked_list_from_file() it doesn't work
Code:
#include <stdio.h>
#include <stdlib.h>
// double linked list structure
struct linked_list {
struct linked_list *next;
struct linked_list *prev;
char *value;
};
[code]....