C++ :: Object Variables Going To NaN

May 26, 2014

So I am trying to develop a sort of 2d spacesim engine for creating games in C++. The project uses SFML for graphics, and I am currently trying to compile it on Linux using g++.

The main issue that I am wrestling with is that of simulation objects having their position, velocity, and rotation variables constantly getting set to NaN for reasons that are beyond me. The behaviour is not consistent, and occasionally will occur or not occur without any discernible pattern.

The github repo for the code is here: [URL] ....

I understand that NaN values can spread easily by operations on one another, but I cant seem to figure out where the initial issue is occurring here.

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C++ :: Unable To Access Private Variables Belonging To Object Class

Nov 21, 2013

I'm unable to access private variables belonging to the object class Date, which my overloaded >> operator is a friend of. I can't see anything in my code that would be causing this error. The .h file and the definition of the problematic overloaded operator from the implementation file are below:

#ifndef DATE_H
#define DATE_H
#include <string>
using namespace std;
class Date {
public:
// Initializes a date to the default value of January 1, 1970.

[Code] .....

The error message states that the vars (month, day, year) are declared as private in the header file and then a reference is made to the lines where I attempt to access these in the .cpp file and it reads: "in this context".

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C++ :: Will Copy Constructor Does Object Initialization Using Another Already Created Object

Mar 16, 2013

will copy constructor does object initialization using another already created object? I understand that it can be applied for object initialization and not for assignment.Is it correct?

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C# :: Method Is Overwriting Both Instance Of Object And Original Object

Jul 3, 2014

I have a method to take a Tile object and make an instances of it based on some data from the original object. Than it is suppose to manipulate the a specific instance and save the results. The first loop through it works but it changes all instance as well as the base.

public static int recurse(int count, Tile[,] b,Huristic h,int check) {
if (check==1) {
boardState.Add(B)/>;
return check;
} if (check == 0)

[Code] .....

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C++ :: Importance Of Static Object In A Class And How They Are Different From General Object

Dec 13, 2012

#include "B.h"
class A {
public :
A()
{
s_b = new B();
b = new B();

[Code] ....

In my project i have seen static object as above . But not able to know what is the exact use of it and how they are different from general object .

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C++ :: What Can't Non-const Object Receive Temporary Object

Sep 11, 2014

a function returns a temporary object like

int myfun(){
int x = 0;
return x;
}

this function will return a temporary integer now void fun1(const int & num); this function can receive from myfun().BUT void fun2(int & num); this function cannot receive from myfun() Why is that, Moreover what is lifetime of a temporary object like one returned in myfun() ???

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C# :: Constructor Object Reference Not To Set Instance Of Object

Mar 28, 2014

I am trying to use web api in order to return custom json response keys. For this i have return a custom class to return json response

Custom Class:

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;

[Code].....

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C Sharp :: Object Reference Not Set To Instance Of Object?

May 4, 2013

I have a combobox with Items 1024
2048
4096
8192

String cach = form.comboCache.SelectedItem.ToString();

I am using the above code to retrive an item selected by user,But this line is giving an exception "Null Reference Exception, Object reference not set to an instance of an object"

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C# :: Object Reference Not Set To Instance Of Object?

Mar 28, 2014

I am using session to pass object from controller to custom class in MVC Web API. here is my code, i am getting error at session.

public HttpResponseMessage Get()
{
var person = db.Persons.ToList();

[Code]....

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C/C++ :: Get Reference To Text Object With The Name Of Object?

Aug 23, 2013

In Visual Studio 2010 C++
I have a series of existing text objects
The text properties names are
item1_lbl,
item2_lbl,
item3_lbl,
….

Based on a selection I want to change an object. I generate the name of the object I want to change in a string so from this string is there a way to get a pointer to the correct text object that is same name?

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C++ :: Starting Vertex Array Object At Index Of Vertex Buffer Object

Sep 22, 2014

I'm trying to figure out how I can create a vertex array object at offset of a vertex buffer object.I've created the buffer object. I'd like the "texs" idnex data to start at the texture coordinate content of the vertex_t structure.

Type definitions:

struct vertex_t {
vector3d_t position;
float s; // Texture coordinate s
float t; // Texture coordinate t
};

Code so far:

// How do I make this start at a certain spot of the VBO?!
glVertexAttribPointer(texs, 2, GL_FLOAT, GL_FALSE, sizeof(vector3d_t), nullptr;
//...

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C++ :: Specifying And Multiplying Two Variables

Feb 23, 2014

I'm very new to C++ so I've been trying to run through some code examples to begin to learn basic structures and syntax, but I've recently run into a problem using examples from the 7th ed. of Sams Teach Yourself C++. I'm using the code provided within one of the examples that allows you to specify and multiply two variables, but when I compile and run the executable the final output seems to only show the first variable and b/c of this the multiplication operation does not work.

Here is a my example code:

Code:
#include <iostream>
using namespace std;
int main() {
cout << "This program will multiply two numbers" << endl;

[Code] ....

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C++ :: Adding 3 Variables One After The Other

Nov 19, 2013

So here is what i need i need a way i can add 3 variables one after the other example:

int a = 1;
int b = 2;
int c = 3;

//Here comes my problem

int d = a + b + c;

When I write it like thet d = 6 ,
but I need it to be 123,

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C++ :: How To Skip Variables

Mar 19, 2013

I am just a beginner in c++..I am making a program on a physics formula PV=nRT(this is formula of ideal gas equation)i have build the program and it run excellently but i want to improve this i am using a condition p==0 because i want to find 'p' but the problem is every time i run the program i have to input p=0 in the screen but i want the program to skip "p" ( take automatically "p" as 0 when i press enter and got to another varibles)

#include <iostream>
#include <cmath>
using namespace std;
int main()

[code].....

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C++ :: How To Initialize Map Variables

Jul 8, 2014

How are map variables initialized?

PLEASE EXPLAIN THE FOLLOWING CODE TO ME?

// accessing mapped values
#include <iostream>
#include <map>
#include <string>
int main () {
std::map<std::string, int> mymap;

[Code]...

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C++ :: First Derivative With Many Variables?

Jun 19, 2013

I have First derivative function implemented in C++. More details [URL] ...

In programming, I'm dealing with a lot of variables. x, y, z & x', y', z' & x'', y'', z'' These are only for one device. The problem is how can I deal with velocities and accelerations the way I did with positions? This is the code

while (1) {
/* Perform a synchronous call to copy the most current device state.
This synchronous scheduler call ensures that the device state is obtained in a thread-safe manner. */
hdScheduleSynchronous(copyDeviceDataCallback, ¤tData, HD_MIN_SCHEDULER_PRIORITY);

x_Position[2] = currentData.m_devicePosition[0];
x_Position[3] = currentData.m_devicePosition[0];
x_Position[4] = currentData.m_devicePosition[0];

[Code] ....

I've tried to create x_Velocity[5] and

x_Position[2] = currentData.m_devicePosition[0];
x_Position[3] = currentData.m_devicePosition[0];
x_Position[4] = currentData.m_devicePosition[0];

[Code] ....

I'm trying also to store x_Velocity in vector. Every time I deal with whether array or vector, the first two points of x position are affected because I'm calling the function for the velocity.

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C++ :: Value Assigned To Int Variables?

Feb 6, 2013

Suppose x, y, and z are int variables. What value is assigned to each of these variables after the last statement executes?

x = 4; y = 11;
z = y - 2 * x;
x = z + y;
y = x + 5 * z;
w = x - y + 2 * z;
x = y + w - x;
-w;

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C/C++ :: Use The Same Variables Between Functions?

Mar 6, 2015

I'm trying to use two variables for two different functions.

#include "stdafx.h"
#include <iostream>
#include <cstdlib>

[Code].....

Every time screen2() runs it always outputs "Numbers entered were 0 and 0". I want the numbers that were entered in by the user in screen1() to be displayed.

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C# :: Can Use Variables From Other Classes

Feb 23, 2014

im creating an address book. One address book contains a ListBox, New User button, Edit User and Remove User button. The first form is suppose to allow you to view the users you've created on the ListBox and you can decide whether you want to remove it, create a new one or simply edit the user. Now The second form simply contains labels and textbox along with a save button. I'm having a bit of issue figuring out the ListBox. I want to be able to create a user and have the user be posted on the ListBox. I read that i must instantiate listbox then simply add it. Now on my form2 i have a for loop that loops through an Array of String were all the users will be created on. How can i call that array of string on to the form1?

Form 1:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

[code].....

EDIT:I just figured out that to call a variable from one form to another you simply instantiate the form then simply call it. PS. must be set to public:

ListBox1 createUser = new ListBox1();
createUser.userString[0];

why doesnt it show the windows when i run without debugging?

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C/C++ :: Cannot Use CPP File Of Variables?

Mar 9, 2014

For a few days now I have been trying to call variables (globes) from another CPP file so I can add/subtract data from them and use them in other places. I have my defines.h file working which contains all my constants but my defines.cpp (which is required to hold all the non constants) are not. Anyways I am getting the error :

Error1error LNK2001: unresolved external symbol "float MONEY" (?MONEY@@3MA)C:UsersJacksdocumentsvisual studio 2012ProjectsAssignmnet2Assignmnet2main.objAssignmnet2

My defines.cpp

//#include "Defines.h"
using namespace std;
//Game mechanic variables
extern float STOCK_LEMONS;
extern float STOCK_SUGAR;
extern float STOCK_ICE;

[Code] .....

If I were to un-comment the "float money = 50" it would work...

I also didn't include my defines.cpp into my defines.h as I got to many errors...

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C/C++ :: Passing By Value With Two Variables

Jun 24, 2014

This is my first time working with C++ and I have put together this program and came up with two errors and I am unsure what it is wanting me to do. The errors I got are:

1>c:usersownerdocumentsvisual studio 2010projectsweek5week5passing_by_value.cpp(30): error C2064: term does not evaluate to a function taking 1 arguments
1>c:usersownerdocumentsvisual studio 2010projectsweek5week5passing_by_value.cpp(38): error C2064: term does not evaluate to a function taking 1 arguments

#include<iostream>
using std::cin;
using std::cout;
using std::endl;

[Code].....

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C++ :: Accessing Variables From Other Files

Sep 26, 2014

I don't have in depth code or anything. I tried this but can't seem to wrap my head around it.

Code: //header.h
namespace test {
int arr[5];

[Code] ....

Also tried putting int arr[5] in a Test class within test.h.

I have 2 structs in another file, the main, and want to make an instance of the arr variable, in a separate header, for each.

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C++ :: Uninitialized Variables In Structure

Aug 7, 2013

I have a structure

Code: struct time{
char hours;
char minutes;
char seconds;
char dummy;
};

I have kept dummy as the data to be aligned.I will update hours, minutes, and seconds , but will not use dummy in any case.

If I don't initialize 'dummy' does it make any errors ?

Do I need to initialize hours, minutes, seconds as well before I use the structure ?

If so is there any particular reason ?

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C++ :: Initializing Variables In Each Class

Sep 26, 2014

I am working on a homework assignment and have most of the program working, but when I try to compile it keeps telling me to initialize the coin variables in each class. However, they are supposed to be added then removed so I don't want to set them back to zero.

Rewrite the Purse program given in Page 35 with functions to perform insert and remove operations. The function insert (int p, int n, int d, int q) will initialize pennies, nickels, dimes and quarters. The function dollars() will return the dollars. The function remove (int p, int n, int d, int q) will subtract pennies, nickels, dimes and quarters. The function display() returns a new String to print the content of the purse with remaining pennies, nickels, dimes and quarters.

Code:
usingnamespace std;
int insert_money (int *p, int *n, int *d, int *q);
int remove_money (int *p, int *n, int *d, int *q);
int dollars();
int main()

[Code] ....

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C++ :: Vector - Out Of Scope Variables

Dec 14, 2013

The situation is the following :

Code:
vector<int>& function(int a , int b){
vector<int> s(3000000);
vector<int> xxx(4);
return xxx
}

Not to board people with details but if i am returning the the reference to a vector xxx what happens to vector s. is it destroyed ?? it should be, but i don't see it on my memory map (memory is not released) . can this be or should i go and search for error on some other place.....

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C :: Returning Value For Item To Variables?

Mar 4, 2014

What the code below is not doing is returning a value for item to my variables (item1, item2, etc..) I'm not sure how I can make a function prototype that will ask for input and basically recycle after going through the program to a new value for each item. I also need to input individual tax for each item. I will also post it in this message:

double tax, item,salesTax;
double cost(double);
double CalcSalesTax(double);
main(){
double total,item1, item2, item3, item4, item5, tax1, tax2, tax3,tax4,tax5;

[Code].....

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