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 :: Passing Variables Among Functions

Mar 6, 2015

I have this code where I am trying to retrieve the contents of the variable dev1 and dev2. for some reason when i compile and run I am getting 0 and 0.

Code:

typedef struct {
uint32_t x;
uint32_t y;
} sample;
void get_sample(sample *one)

[Code].....

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C++ :: Passing Variables Into A Function

Mar 29, 2014

ok I have a class Player with lots of variables and im gonna call a function to checkXp, if I call it with the whole player object does it use a lot more memory then if I just passed the couple things I need?

ex
checkXP(Player* play) // this is a whole object of player
or
checkXP(play->getXP(), play->getLVL()) // the variables I want.

I just realized I may not be able to modify anything from player in the checkXP() function

question 1: does passing the whole object use more memory
question 2: if I passed as just the variables I need, I wont be able to modify anything of object play?

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C++ :: Variables Not Passing Correctly

Mar 10, 2013

Well I have my program running and the Variables are not passing correctly and the return statements are not returning correctly. Here is the parts that are not working.

#include <iostream>
#include "fight.h"
#include <time.h>
#include "player.h"
#include "stdlib.h"
#include <cstdlib>
using namespace std;

combat A;
combat::combat(void)

[Code] ....

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C++ :: Passing Variables Between Functions

Jan 29, 2013

I need passing some variables between functions. Here is the first part of the code which does work.

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
struct CarType {
string maker;

[Code] ....

Now the book says to take the following program and add a member function to the CarType class which prints the values of all of its data members. Add two more data members which are relevant for cars. Add the use of these data members to the program (to the assignment statements for MyCar, to the operator prompt and input inside the getYourCar function, and to the print function you have created).

Here is my code. Whenever I run it, it takes my assigned variables in MyCar and prints those instead of the one which the user is inputting.

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
using namespace std;
struct CarType {
string maker;

[Code] .....

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C++ :: Passing Array Of Variables By Reference?

Sep 10, 2014

I define an integer variable and pass it by reference to a function.

int func(int &x)
{
// do something
}
int x;
func(x);

However, I have not only one variable but an array of variables with its predefined name. How do I pass to the function by using loop? Example:

int x, y, z;
func(x);
func(y);
func(z);

How can I do this by using loop?

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C++ :: Passing Both Private And Public Variables-functions?

Mar 6, 2015

How to properly pass both private and public variables/functions from one class to another?

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C++ :: Passing Data Between Threads Without Using Global Variables

Nov 6, 2013

I have a main thread and a worker thread. How do i pass data between them when both are already running without using global variables?

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C :: Passing Int And Float Variables From Main And Getting Values From Another Function

Feb 3, 2015

I have the main() - which has entries like

Code:

main() {
int ss, ret, z;
float yy;
ret = function1(&yy, &ss, &z);
//int function1(flat *cc, int *dd, int *k) - is it correct?

[Code]...

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Visual C++ :: Passing DDX Control Variables Between Dialogs (Parent->Child)

Jul 19, 2013

I have a main dialog which has (DDX?) controls for the user. eg a slider, and a combo box.

Previously, an image adjusted by these controls was in the same dialog.

I need to put this image in a New, separate dialog but it still must be controlled by the slider and combo box on the main dialog.

My question is how can I pass the control's variables between the dialogs? I have, say,

Code:
//MainDlg.cpp
DDX_Control(pDX, IDC_ComboBrightness, m_Brightness
I was told that I could do something like:

Code:
//ImageDlg.h
public:
ImageDlg(CWnd* pParent = NULL, CComboBox m_Brightness); // standard constructor

But I get errors including: Missing default parameter for parameter 2

I also need to pass the image array, is that perhaps the same method?

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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++ :: 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/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++ :: 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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C :: How To Enable Numeric Variables

May 22, 2013

working on this code I have encountered a few issues. My program lists the occurrence of each letter but i'm unsure of how to enable numeric variables. how to improve the overall quality of the code.

Code:

#include <stdio.h>
#include <string.h>
int main()
{
char string[100], ch;
int c = 0, count[26] = {0};
printf("Enter a string

[Code]...

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