C++ :: Initialize A Class In A Manner Similar To C Arrays
Jan 6, 2015
In my case, it involves making a wrapper class of sorts for the std::set. I'm wanting to go all-out on it and make some "fashionable" constructors for it, one of which being similar to C-style array initializations.
// Some example usage of what I'm wanting.
Set<long> num_set = { 10, 20, 30, 40, 50 };
Set<std::string> str_set = { "Hello", "I", "am", "a", "set." };
I almost never overload operators when I work--if it can be done with a function, it's done with a function--but I realize that doesn't make the best user-experience when other people come across your code, so that's what I'm trying to improve.
It looks like I'm going to be needing to overload the = operator, no big deal. But the array segment is confusing, since {} is not an overloadable operator in C++.
/* This is what I have so far what i am trying to do is to initialize the arrays at zero and output the board to the screen. Part of the problem is the user has the option of the board size. All this is suppose to do is to output the board to the screen. I am having problems understanding 2D Arrays. */
using namespace std; int main() { const int BOARD_MAX = 10; // Maxinum Board size. const int BOARD_MIN = 3; // Minimum Board size. array = [COL]; array [ROW];
As it turns out, I cannot use method (1) when I try to initialize a private instance inside another class. But I can use it in the main() code. I hope the code below will explain what I mean. Why only method (2) will work inside another class? Or is there another fundamental mistake I am making?
(BTW: I used CodeBlocks 13.12 with GNU GCC compiler for this example)
#include <iostream> using namespace std; class CLASS1{
"You cannot initialize the static data member in the class definition — that’s simply a blueprint for an object and initializing values for members are not allowed. You don’t want to initialize it in a constructor, because you want to increment it every time the constructor is called so the count of the number of objects created is accumulated."
Why don't you want to initialize it in a constructor?
Edit: Because every time it is called it will set it back to 0 or whatever the initializing value.
The value -1 at the end of each line does not mean anything but I need to keep it.
Finally LIST3 tells me if the points are connected counterclockwise (-1), clockwise (1), or coolinear (0).
The thing is that I want to get things as follows:
If the values of list 3=1 then I need to extract all the points in the list 1 that correspond to the value 1 in order. However the values in LIST2 cannot keep being 1, 4, 2,-1 they need to be reorganised starting by zero. Expected result in LIST2= 0,3,1,-1.
We need to do this for each value in list3 (1,-1 and 0).
The idea is to get 3 groups of values:
- Group 1 including all the values that are clockwise (list3) with the points in order in list1 and showing connections starting from zero on in list2.
- Group 2 including all the values that are counterclockwise (list3) with the points in order in list1 and showing connections starting from zero on in list2.
- Group 3 including all the values that are coolinear (list3) with the points in order in list1 and showing connections starting from zero on in list2.
The idea is to be able to print 3 files in the following way:
I am trying to work with C# and i am stuck here. My problem is i want to retrieve the count of all the users in a specific side. Let me Explain. Here is my table snapshot with sample data.
Now what i want exactly is that i get the count of users in a specific side as i give a user id as a parameter.The data is stored in MS Sql Database and i have to implement this on a website so efficiency of code is also a issue.
Suppose i give 1001 as input The output should be : Left:1 , Right: 8
if 1002 is input The output should be : Left:5, Right:0
if 1003 is input The output should be : Left:3, Right:0
if 1004 is input The output should be : Left:0, Right:0
if 1005 is input The output should be : Left:1, Right:1
and so on. how to implement this thing. I also want to get a code which would return an array of all child users of a particular ID in a hierarchical manner so that i could process that data with RadOrgChart Control.
Write a program that reads in the numeric representation of a date and prints it out in a formatted manner as the box below.
1. If the user entered an invalid number for the month it should display "Invalid Month" 2. If the user entered an invalid number for the date it should display "Invalid Date" 3. Check to see if the day is outside the range for that particular month
An example of the input and the output: Enter the date: 1 24 2013 The date you entered is: 1242013
Im not sure on how to go about this problem, but this is what I have.
#include <stdio.h> int main(void) { int a, b, c; int status; printf("Enter the Date"); status = scanf("%d,%d,%d",&a, &b, &c); printf(" The Date is : %d",status); return 0; }
Am I going about this right? Is there an easier or better way to go about it? All that happens is that the program reads the first number and spits that back out.
The following code compiles and runs fine till it reaches line 16 and gets a sigsev violation which I'm not sure about as to why. I have no problem passing the object of type node** into the constructor of base and storing it into the double pointer node** copy;; but when I call the function void pass(node** temp) it crashes.
#include <iostream> class base; class node { private: node** data; public:
How to output vector contents using the push_back function. My program reads in values just fine, but it does not output anything and I've been stuck on why.
here is my code:
#include <iostream> #include <array> #include <vector> using namespace std; int duplicate( vector < int > &vector1, const int value, const int counter)
I'd like to start out by adding an array to a C++ class. I'd like to be able to reference the array using a class object that I create, for example:
Class is Stone.
Stone Bob is an instance of "stone" that I name "Bob".
"Bob.array[1] = "granite";" tells the compiler that the second element in the array (with the first being the zeroth element) is a string containing "granite".
I'll eventually want to extend this to an n x m matrix within the "stone" class that can be referenced as: Bob.matrix[1][3]="lignite";
I tried to make this work using a text again and again last night to no avail. My code is below.
NOTE: Since I am dynamically allocating memory space, I'd like to avoid memory leaks when using this class with dynamically allocated arrays and matrices. Not sure how to do this. Also need some insight into "destructor", and why my simple version reduced to a comment below doesn't seem to please the compiler.
CODE FOLLOWS:
Code: // AINOW.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <iostream> #include <string> using std:: string; using std:: cout; using std:: endl; using std:: cin;
If i have a pointer array of classes, e.g. MyClass *foo; and if i try to delete this pointer delete [] foo; does it call a destructor of a class, or wahat happens? this is because i have another pointers in that class which are cleared in destructor.
I am currently stuck on what I should do next in a program I am working on. These are my instructions:
Design, implement, and test a class for storing integer arrays "safely". The array should be able to hold any number of integers up to 100.
In the class header file "SafeArray.h" students must define the class and specify the constructor/destructor functions, the public methods and private variables. In the class implementation file "SafeArray.cpp" students must implement the following operations:
constructor - to initialize the object. copy constructor - to copy an object. destructor - to delete the object. set - allow the user to set a value of the array at a particular location. get - allow the user to get a value of the array at a particular location. print - print out the array. add - add the elements of one array to another. subtract - subtract the elements of one array from another.
The output of my program is suppose to look like this:
Set q1: 2, 3, 4 Print q1: 2, 3, 4
Set q2: 1, 4, -2 Print q2: 1, 4, -2
Add q2 to q1
Print q1: 3, 7, 2 Get q1 at 1: 7
Here is the code I have so far.
*main.cpp*
#include <iostream> #include "SafeArray.h" using namespace std; int main() {
I'm having trouble with passing a character array between functions of the same class. I have a function, buildGraph, that calls function getNextLine. The getNextLine essentially just retrieves the next line of an input file and stores it into a "char line[80]". However when I try to use "line" in my buildGraph function, it has nothing in it.
Here's my code:
Class #define NUMNODES 10 using namespace std; #pragma once class Prog3Graph
The deck of cards so it is populated with all 52 cards. Once you have populated the deck, you need to shuffle the deck. Here is a simple algorithm you might consider for this purpose:
For each card up to the middle of the deck generate a random number modulus the size of the deck, swap the current card with the card at that location done
To implement this requirement you need to implement and use the following functions:
I have written a program, in which I create a NxN-matrix. As I need some different samples (some different such NxN-matrices), I try to create a new matrix in each recall of a while-loop. The first recall of the while-loop works without any problems, but the second recall crashes, but I get any errors from the compiler. Here is my quell code. The problem should be with line 44:
imagine you have a world class. Than you have a tile class. Now, in the world class is a array with a lot of tiles and I want to initialize them with my imagination(For example I want a grass floor). But how I can do this, the array can only be create with the standard constructor. But it would be stupid and not very fast, that the tiles are first initialized with the standard constructor and than overridden to build the world. Whats the best way to initialize such a array ?
