C++ :: Any Possible Way To Shrink Array With Delete Operator
Sep 18, 2014
We can't use the std::vector, std::map and std::lists implementations.
std::realloc doesn't call the destructor automatically.
If it is theoretically possible, we'll consider it and write lines similar to it, which should remain commented until something similar is possible.
int main(){
#define START 1000000000
#define END 10
unsigned int * array=new unsigned int[START];
delete[START-END]array;//Our suggestion to shrink the array
delete[]array;//Delete the array
return 0;
}
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Feb 27, 2013
Suppose I have the following structure
struct b
{
char fullname[100];
char title[100];
bopname
};
and i declare a pointer to the struct as follows
b* bp;
and at runtime,
bp = new b[5];
In the end, is the statement delete[ ] bp enough to release the dynamically allocated memory. Or do i need to separately delete bp[0],bp[1]...
Does delete[ ] bp indicate that the array[ ] pointed by bp has to be deleted?? [I am confused as to how this happens, since the pointer only points at the 1st struct address]
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Dec 31, 2012
I am not getting the real concept of delete operator. If it deallocates the memory, then why i am getting such output..!!
int main() {
int *a , b=5;
a = & b;
cout << *a << endl;
delete a;
cout << *a;
getch();
return 0;
}
Output:
5
5
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Sep 27, 2014
We're trying to overload the delete[] operator with specific arguments. Which is the right way to call it? We use the GNU compiler and obtain compiler errors with all of these samples:
#include<iostream>
using namespace std;
typedef unsigned int P;
[Code]....
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Jan 12, 2013
int main() {
int vnum = 0;
VEHICLE *vehiptr;
VEHICLE *dptr;
cout<<"Please enter the number of vehicle: ";
cin>>vnum;
vehiptr = new VEHICLE[vnum];
[Code] .....
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Jul 14, 2013
How can I declare global 'delete' operation multiple times? Like, I've an implementation of global 'delete' operation in a file 'x' but I want a different behavior in file 'y'. However, if I override it again in file 'y' I get multiple definition error.
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Mar 30, 2012
Code:
class CUser {
public:
CUser();
~CUser();
protected:
std::string firt_name;
std::string last_name;
[Code] .....
How would I go about shrink the duplicate data set from CWorksheetTwo? For CWorksheetTwo has both CUser and CUserEx, and I only need CUserEx, and all other classes are happy with CUser
Since there is no such thing virtual variable what are my choices? In CWorksheetTwo set users to NULL and use another exclusively? Change CSettings variable to template <class T> std::vector<T>users?
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Jul 31, 2012
I've created a solution who exported Access reports (graphics/tables) to a Word- and a PDF-format. Therefor I use PDFSharp and PDFFocus.
The PDF document is okay. But the Word-document looks good. Only the size of the Word-document, it has to send by e-mail, is much too big (17MB).
I have to open the Word document again to change the PageSettings to be sure, that the page-margins and the print orientation are correct.
using System;
using Microsoft.Office.Interop.Word;
namespace PageSetup {
class TestPageOrientation {
static void Main(string[] args)
[Code] .....
I don't know how it works in the Word-library source. But I've tried WdOrientation.wdOrientPortrait and once I was surprised. I saw this page in Landscape-format.
I think there is something wrong with my document sections, because the documents (with a lot of tables, graphics and a image) is much too big. And that's only after using this method.
So my next question is: How can I shrink the size of this Word document?
And what do I have to do to limit the amount of format-settings in this word-document?
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Jan 9, 2015
how to delete an element(s) from an array; suppose I have an array x[10] = {1,2,3,4,5,6,7,8,9,10}, and I want to delete array{5} so that the values of the array become {1,2,3,4,5,7,8,9,10}; how do I go about this? This is not the same as setting the value of array{5} to null; but completely eliminating it so that it does not get printed alongside the other elements of the screen.
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Sep 2, 2014
int * ptr = new int[5];
p += 2; //p now stores address of 3rd element in array
delete [] p;
what will be deleted??? all 5 elements or just 3rd, 4th and 5th elements of array(in result making a memory leak)
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May 1, 2014
How do i delete the first character in a character array?
I want output to be
void DeleteFirst (char S[ ])
{
for( int i = 1; i < MAX_LENGTH; i++)
cout << S[i];
}
i am just writing the wrest of the Array without deleting the first. how do i delete the first?
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Nov 23, 2014
I have this code and so far it does everything it should although I'd like to know how to actually delete the elements from the array so after the duplicates have been removed the size of the array should be 7 and not 10.
#include<iostream>
using namespace std;
int main(){
int nums[10] = {2,7,2,5,4,0,7,6,9,0};
int a, b, t;
int size;
size = 10; //array size
[Code]....
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Apr 4, 2013
Any example to delete an element in an array of structure?Is it same as deleting an element in an array.ie like this....???
// to delete an element in an array
#include<iostream.h>
#include<conio.h> // for clrscr() and getch()
void main() {
clrscr();
int a[50],n,t,index,i;
[Code] .....
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Dec 9, 2014
I have to manage a Clinic. I need to delete a booking (for example, if John said he's coming on March 22nd at 15:30 but then he say he's not going to come, I have to delete that booking so another person can use it).
idSearched: the id of the person that is not going to come. I have a lot of specialties and each one has a list. So I ask for the speciality to delete the node (the node contains John's booking). If I don't find it, I return (-1). searchSpecByID return a pointer to the list where the speciality is. So head will point to the first node of the list. In nodeToDelete I have the node I want to delete.
The program detects OK when is the first in the list and when not, but it doesn't delete the node.
Code:
typedef struct bookingList{
tSpecialty specialty;
struct nodo* intro;
} tList;
[Code].....
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Mar 22, 2013
I'm doing a refresher for C++ and have gotten to operator overloading. I'm trying to perform an operator overload with the insertion (<<) operator, but I have encountered a problem.
Here's my class [In a header file "Shinigami.h"]
#include<string>
namespace K{
class Quincy;
class Shinigami{
friend std::ostream& operator<<(std::ostream&, const Shinigami&);
[Code] .....
If the operator function is a friend of the 'Shinigami' class, why doesn't it recognize any of it's private members? I need it to be in this file because I'm doing a bit of association with the 'Quincy' class.
I thought it was the namespace, but I included that.
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Mar 26, 2013
So I'm trying to make an employee list that holds the information so I can then delete or add from that array. I'm getting some errors regarding overloading function.
#include "employeelist.h"
const Employee & employeelist::operator [](int index) const {
return ( (this->Employees)[index] );
} Employee & employeelist::operator [](int index) {
return ( (this->Employees)[index] );
[Code] .....
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Jul 19, 2014
How to store 10 elements in an array and delete the duplicate terms ? ( its a single dimension array )
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Aug 26, 2013
Right well I've got this error and I don't know where to go from here because I can't find out how to get rid of it. I'm afraid I don't actually know where the error is coming from so I can't just paste a single function or such.
Exact Error:
error C2075: 'Target of operator new()' : array initialization needs curly braces
File: {install-src-dir}xmemory0
Line: 606
Column: 1
Project: Data
[URL]....
There are 2 files directly involved and I've had the error since before adding Registry.h but basically the Data namespace is the base of all data handling with my program and also provides a base class (Filed) for everything to derive from, it's an abstract class and hence forces definition of required functions for the child classes.
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Feb 7, 2014
Imagine these simple class:
Code:
class test {
public:
void write(string a) {
cout << a;
}
};
(these class wasn't tested... it's for these question)... Can avoid the class use the array operator('[]')?
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Jun 19, 2012
I what to implement to my Template operator * . There is <Template> Array which purpose is container like vector for classes. There is class Point, each object of contain two coordinate x and y.
So,
1. I wanna fill Array with objects from Point class
2. Multiply each objects from this vector to a factor
3. And print all this bunch of objects ()...
Compile error :
1>------ Build started: Project: HP_4.2b_Ex2, Configuration: Release Win32 ------
1> main.cpp
1>main.cpp(21): error C2440: 'initializing' : cannot convert from 'Point' to 'Array<Type>'
[Code] ....
And pop -up helper tell that : Error: no suitable user defined conversion from "Point " to Array<Point> exist
Code:
//array.h
#ifndef Array_H
#define Array_H
template <class Type> //Remove the "=double" default parameter.
class Array {
protected:
int m_size;
Type* m_data; //m_data should be a pointer, since you want to allocate data to it
[Code] ....
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Jan 7, 2014
I need an implementation for the array index operator overloading of my Fraction class . The Fraction.h looks like :
#include <iostream>
using namespace std;
class Fraction {
public:
Fraction(int = 1, int = 1);
[Code] .....
I am not able write the Array index operator overloading functions.
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Feb 8, 2014
General Purpose: Delete all "white spaces" in text file, until the read-in char is _not_ a whitespace (mark as start of text file).
Problem: Cannot seem to shift char's over properly. (I think my problem is the inner loop - however other code may lead to this problem - I do not know)
Code:
#include <fstream>
#include <iostream>
using namespace std;
bool trimWhiteSpace(fstream &file, char * charMemoryBlock) {
if (!file.is_open()) {
[Code] ....
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Jul 25, 2013
I am beginner with C++ and I want to know. When do I use new and delete keywords? And what can I use them to do? Only thing I know about the new keyword and delete is that you can do this:
Code:
int Size = 5;
int *ptr = new int(Size);
cout << *ptr << endl;
delete ptr; And more . . .
But when do you use this keywords? I am just curios about them and want to now if them can be really effective to use.
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Apr 18, 2014
int NextPixel(int antIndex, int currentPixel , Ant *ant , IplImage *edgeImg) {
int left = currentPixel - 1 ;
int right = currentPixel + 1 ;
int up = currentPixel - edgeImg->widthStep ;
int down = currentPixel + edgeImg->widthStep ;
[[Code] ....
if those lines are uncommented , program gives heap error.Why?
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Jun 11, 2014
How would I delete a row in a datagridview (and in the database) if the datagridview control does not show the primary key? ie the SELECT statement we used to load the DataGridView does not include the primary key column (since it is not relevant to the user)
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Dec 1, 2013
My delete is not working. Why?
Code:
struct MatchName{
MatchName(string& searchName) : s_(searchName) {}
bool operator()(const clsStudent* student) const {
return student->getName() == s_;
[Code] .....
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