C++ :: Hold Group Of Variables In One Variable

Oct 4, 2014

So far i know that the pointer is address value to the real variable. Pointer size depends on operation system right?

for example
32bit systems: 4byte pointers
64bit systems: 8byte pointers
128bit systems: 16byte pointers?

Anyways, there have to be an variable type in c++ what can hold a pointer.

Let's imagine that the int is the thing im looking for

struct stc1 {
char *chars;
int ints;
}
struct stc2 {
char *chars;
float floats;

[Code]....

My wish is to hold different types of variable or groups of different type of variables in one variable.

I am developing program in windows now yet it will be used in linux and who knows with what x bit systems.

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C++ :: Variable That Can Hold String And Int In Same Time?

Feb 12, 2014

Is there a variable that can hold string and int in the same time?

If not, what can I do if I want to input data with string and int like a password for an example.

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C++ :: Declaration Of Variable To Hold A Table Of 5 Records

Aug 27, 2014

im doing a program to store name, age, time and fitness. and i need to hold a table of 5 such records.can i do this?

#include <iostream>
using namespace std;
int name1, age1, time1, fitness1;
int name2, age2, time2, fitness2;
int name3, age3, time3, fitness3;
int name4, age4, time4, fitness4;
int name5, age5, time5, fitness5;

[code].....

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C++ :: SDL - Check For A Key That Is Hold Down?

Sep 13, 2013

I'm using SDL to try to create a Run and Shoot game. But I do not know how to check if a key is down while the user is HOLDING it.

I do know how to check if a key was pressed.

I have tried with the "event.key.keysym.sym" and "Uint8 *keystate = GetKeyState(NULL)" both worked to check if a key was down but I thought that the GetKeyState(); Function would even check when a key where HELD down

I want my player to move while holding down left or right arrow. So I did something like:

Code:

Uint8 *keystate = GetKeyState(NULL);
if (keystate[SDLK_RIGHT]) {
apply_surface(x++, y, player, screen);
}

How to check if a key is held down?

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C++ :: Selecting Elements From A Group?

Jul 16, 2013

I have N vectors which look like this:

[1→m] [m+1→2m] [2m+1→3m] [3m+1→4m] [4m+1→5m]..... [{(N-1)m}+1→Nm]

I want to select 1 element from each vector without duplication of any combinations.

Essentially only when all combinations are done with 1st element in first vector ,only then it should move to next element in first vector say i have elements :[123] [456] [789]

my combinations should be like

147
148
149
157
158
159
167
168
169
247….

Also, i need no repetitions and only after all combinations of 1 are done only then the loop has to move to next combination ie 247 combination and so on.

i tried NCK (n choose k) command but it gave me random combinations.how should i go about it with using minimal for loops

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C++ :: Hold Screen Via GUI To Console

May 15, 2013

I had a program (on console) that uses a third-part software to draw some graphs. In order to hold the graphs on the screen, I used cin.get(); and that worked.

Now I created a GUI with Qt. The code remains generally the same. The code continues to call the software to draw graphs (during drawing graphs, there is a console opened automatically). Butcin.get(); in the code cannot hold the graphs on screen anymore. The graphs appear and disappear immediately.

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C :: How To Declare A Group Of Arrays Of Different Sizes

Oct 15, 2013

I'm building a box to take in several arrays of different lengths. one group happens every 10 seconds. one of them happens every 5 seconds. this is from a weather station.

10 sec
subgroupA[14]
subgroupB[24]
subgroupC[17]
subgroupD[12]
subgroupE[34]

5 sec
subgroupC[17]

I plan to retransmit them, substantially unchanged at a lesser rate to save radio power over a serial data link. buried in groupD, I want to change a few chars before retransmit.

I don't want to go to the trouble of doing a structure for each of them since most will be resent unchanged. some entries are chars, some are decimal, some are a mix. I guess it might be convenient to further define groupD, maybe not.

what is the best way to declare the group? I want them to be contiguous since that's how they will end up in the tx buffer. Each subgroup has its own checksum, so I planned it this way to make checksum more convenient.

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C :: Generate And Print Subsets Of A Group

Dec 13, 2014

I'm a beginner in C programming and I've got a task that can't finish it..I'm supposed to generate and print the subsets of a group that its size I should enter. Pointers are not allowed!!

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C++ :: Separating Prime Numbers In Group

May 25, 2013

I currently need separating my Prime numbers in group for my assignment. I absolutely do not know how to do this. I am able to find out if the number I used is prime and see how many prime number there are between 1-100 and then 1-1000 (168 primes) and so on. The thing that I need to do is find the number of prime numbers between 101-200, 201-300, 301-400, and so on until 901-100 and have it show on screen. Here is the exact assignment that I’m supposed to find out:

Assignment:

Write a C++ program to calculate and display the number of primes from 1 to 100,000, separated in groups of 100, 10 groups per line. To be more precise, on the first line of output, display the number of primes between 1 and 100, 101 and 200, etc., up to 901 to 1000. Then display the average primes per group. For example, there are 168 primes from 1 to 1000, so the average number of primes per group of 100 (or percentage) is 16.8. Then repeat the process for the groups of 100 between 1001 to 1100, 1101 to 1200, etc., for all groups of 1000 all the way up to 100,000. Your results should be as presented below, under testing.

Testing:

The output of your program should be the following, according to my calculations. Each group (g1, g2, etc.) is the number of primes in a group of 100 numbers. For example in line 1, g1 is the group from 1 to 100, g2 is the group 101 to 200, etc. For line 2, g1 is the group 1001 to 1100, g2 is 1101 to 1200, and g10 is the group from 1901 to 2000.

g1 g2 g3 g4 g5 g6 g7 g8 g9 g10 Average Primes
----------------------------------------------------------------
25 21 16 16 17 14 16 14 15 14 16.8 for 1 to 1000
16 12 15 11 17 12 15 12 12 13 13.5 for 1001 to 2000
14 10 15 15 10 11 15 14 12 11 12.7 for 2001 to 3000
12 10 11 15 11 14 13 12 11 11 12.0 for 3001 to 4000



7 10 5 10 7 11 7 6 11 8 8.2 for 97001 to 98000
7 5 9 9 11 8 7 8 12 11 8.7 for 98001 to 99000
8 11 8 8 7 9 8 10 10 8 8.7 for 99001 to 100000

Total number of primes from 1 to 100000: 9592
Average primes per 1000: 95.92
Percentage of primes from 1 to 100000: 9.59

Here is my code that I have done so far:

#include <iostream>
#include <string>
#include <cmath>
using namespace std;
bool isPrime(long candidate);
long primeCount (long start, long end);

[Code] ....

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C Sharp :: How To Give Scroll Bar For Group Box

Oct 11, 2012

Is there any methods to add scroll bar for group box

My code scenerio is: I have many groupbox in form, all group box will be appears in same place and also height and width is fixed. I'm doing group box visible true/false according to condition.

So some groupbox ecxeeds the width and heighto so I want to put this all in scroll Bar

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Visual C++ :: Sum Multiple Group To Find The Max

Dec 17, 2013

How to sum groups in C++? I have a class with 2 attributes (Group and Price). I need to find the group with the highest amount. I can find the max when it comes to finding a set of individual numbers but not when a group is required. For Ex:

Group A64
Group A48
Group A18
Group B49
Group B36
Group C64
Group C75
Group C87
Group C72

The group with the highest amount is GROUP C

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C++ :: Simple Way To Hold Numbers With Lot Of Decimals

Apr 8, 2013

I have a task to hold a number like 4.0000000000000000199e+30 and, in a variable like long double (the largest of the data type) doesn't hold the whole number, holds only 4.099e+30, like that.

Any way to hold the whole number?

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C/C++ :: How To Use The List Container To Hold A Class

Dec 11, 2013

How would I use the list container to hold a class?

class A {
    private : int x;
    public  : void setX(int val) { x = val; }
};  

class B {
    private : std::list<A> pdata;
    public  : void addToList();
};  

For adding, I thought of trying something like

void B::addToList() {
   A *tmp = new A;  
   if(A != 0) {
      tmp->setX(5);
      pdata.insert(tmp);
      delete tmp;
   }
}

How would I do what I'm trying to do? Or is this the wrong way to go about it? For the actual program, "B" would contain several lists of various classes.

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C++ :: How To Enable Array To Count Items From A Group

Dec 27, 2013

Arrays are by far the most fun to work with and I really need see if its possible to enable an array to count apples, pears, peaches, from a group of three each.

If any of the fruit groups were chosen how might an algorithm be put together to count how many were chosen from each group. But lets take into consideration that these fruit groups are not supposed to be randomly generated, instead they belong as an array with certain amount of chosen occurrences. To show how many fruits were chosen from each group example, 1 from group 1, 2 from group 2, 3 from group 3 the out put is the important part because it shows the group and the occurrence of that group. the algorithm should be able to display the group with an occurrence as well

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C++ :: Write Program That Reads Group Of Chars?

Nov 28, 2014

Write a program that reads a group of chars till $. Then, compute # of vowels, # of digits, # of word and # of special chars. Your program should display all required results.

So in what way should I do it? Loop, array, ...?

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Visual C++ :: How To Detect Multicast Group Address

Nov 13, 2013

I have a problem with UDP Multicast. I managed to send UDP Multicast telegrams and receive them. But when I receive the telegram I need to find out to which multicast group address it was sent. So far I have:

Code:
recvfrom( hSocket,
pcData,
nMaxDataLen,
0,
(SOCKADDR*) &from,
&len);

When I read from.sin_addr.S_un.S_addr; then I get the original IP Adresse from the sender PC but I also would like to know to which group address it was sent. Is there a way to get this infoamtion?

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C++ :: How To Hold Pointers / References To Abstract Class

Nov 15, 2014

I have an abstract class named Terrain, and a class named RoadMap, which supposed to hold an N*N array of Terrains. But I'm not sure what type should the RoadMap class hold:

Code:
#ifndef TERRAIN_H
#define TERRAIN_H
class Terrain {

[Code] ....

I can't use an array of refernces here, so I tried this:

Code: Terrain** terrain; and then I thought this was the way to go:

Code: Terrain (*terrain)[]; But now I'm not sure.

The N*N matrix size supposed to be determined according to a given input... What type should I use there?

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C++ :: Create Structure To Hold Data For A Kennel

Apr 3, 2013

// This program creates a structure to hold data for a kennel

#include<iostream.h>
struct KennelList {
int dogID;
char gender;
int age;

[Code] ....

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C++ :: Reading Group Of Numbers Per Line In Text File

Mar 27, 2013

I am working on a project for school that has us read in a text file that contains 8 lines of SSN and grades. I am not sure how to go about reading in the lines and differentiate between the SSN and grades in the calculations.

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C++ :: Template To Hold Two Dimensional Arrays - Automatic Indexing

Mar 6, 2015

For the past couple of weeks I have been working on a template to hold two-dimensional arrays. Right now I am puzzling over an indexing question.

There are many places in the template where I would like to use initializer_lists to refer to user-specified row and column ranges, particularly in member function arguments. A typical example would be a member function whose declaration would be along the lines of:

Code:
Array<Type>::some_function(std::initializer_list<int> columns, std::initializer_list<int> rows); which could get called via

Code:
arrayInstance.some_function({3:4}, {5:8});

It would be really nice to be able to use Matlab-style indexing to specify the last column, or the last row, in the Array object -- along the lines of

Code:
arrayInstance.some_function({3:4}, {5:END}); where END takes the value -1, and can be defined in Array, or somewhere else.

The way I have tackled this so far was to write myself an Indices PODS class with two elements to hold start and finish values, and a constructor-from-initializer_list that looks something like this:

Code:
Indices::Indices(std::initializer_list<int> range, int replace_value) {
int const *it = range.begin();

start = (*it == END) ? replace_value : *it ; ++it;
finish = (*it == END) ? replace_value : *it ;
...
}

So the elements of "range" give the values of Indices::start and Indices::finish -- but if either of them are entered as END by the user, they will be replaced by replace_value. (The default value of replace_value is END, so Indices::start and Indices::finish will never change if it is omitted.)

I also defined an Indices::endset(int) function to do the same thing for existing Indices objects:

Code:
Indices::endset(int replace_value) {
if (start == END) start = replace_value;
if (finish == END) finish = replace_value;
} Using Indices::endset, you can code up Array::some_function by modifying the above signature to something like

Code:
Array<Type>::some_function(Indices columns, Indices rows) {
columns.endset(this->M);
rows.endset(this->N);
...
}

This does work, and I've been able to use it in practice. However, it is klutzy. What I would really like to be able to do is have the Indices constructor handle value-replacements in "columns" and "rows", instead of needing to put calls to Indices::endset in every single Array<Type> member function that uses this approach.

The basic problem is that, when Array<Type>::some_function is called, there is no easy way of inserting Array<Type>::M and Array<Type>::N into the optional argument of the Indices constructor when "columns" and "rows" are being built.

The Indices class needs somehow to get access to these, and know which one is being used, M or N. So it needs to have some sort of deeper connection to Array<Type>, but I don't know what that connection should be.

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C :: Dynamically Create A New Memo Structure To Hold Memorized Fib

Jun 14, 2013

I need to dynamically create a new Memo structure to hold memorized fib #'s.I have two structures:

Code:

typedef struct HugeInteger
{
//array to hold the digits of a huge integer
int *digits;
//number of digits in the huge integer
int length;
}

[code]....

am having trouble with initializing the struct inside of the new Memo, I need the digit fields to null and the length field to 0 to indicate that F[i] has not yet been memoized...I have F->digits and F->length in the for loop but this just simply doesn't work..

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C :: Finding Positive / Negative Integers Unsigned Can Hold

Jan 25, 2013

Consider a new data type, the mikesint, which can hold 9 bits.

(a) What is the largest integer that an unsigned mikesint can hold?
(b) What is the largest positive integer that a signed mikesint can hold?
(c) What is the largest negative integer that a signed mikesint can hold?

Not sure how to determine this. I'm stuck.

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C++ :: Hold Vector Of Pointers In Same Class As Instances Of Those Objects?

Feb 10, 2015

Using SFML, I had a Board class which held multiple vectors of all of my object types in the game, and then it also held a vector of pointers to the memory addresses of these object instances, like this

class Board{
//...
std::vector<AbstractObject*> GetAllLevelObjects(){ return allLevelObjects; }
//so these are used to hold my object instances for each level

[Code]....

When looping through this vector and drawing the sprites of the objects, I get the runtime error 0xC0000005: Access violation reading location 0x00277000. I solved this error by storing the vector of pointers in the class that holds my Board instance, but I'm wondering why only this solution worked? Why couldn't I just have my vector of pointers in the same class that the instances of those objects were in?

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Visual C++ :: Program To Output A Line For A Specific Age Group - CPP File

Feb 13, 2013

I am suppose to make a program that will output a line for a specific age group,but everytime I execute the exe file it gives me the desired line and also the last line included everytime.Where did I go wrong with it including the last line everytime?

#include <iostream>
using namespace std;
int main() {
double age;
cout<<"Enter your age:";
cin>>age;
if (0<age && age <6)

[Code] ......

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Visual C++ :: Edit / Update And Display Group Of 40 Parameters On Screen

Feb 26, 2014

I need to edit ,update and display a group of 40 parameters on screen. (10 parameters per page and use of Arrow Key pad or touch screen clicks to modify value)....

For that I will need .. Parameter No . , String Name , Point Screen Cord , double value , next element no. etc I have my old code with structure and array of structure written in C. I have translated it on C++/MFC .

How can I implement Class property of c++ ?

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C++ :: Array To Template Class - Finding Largest Number From A Group Of Numbers

Sep 26, 2013

I'm trying to make an array that takes a group of numbers and finds the largest number into a template class.

template<class TYPE>
void Integers(TYPE data) {
int integers[] = {4, 25, 32, 85, 150, 12, 98, 200};
int i = 0;
int Max=integers[0];
for (i=1; i < 8; i++) {

[Code] ....

I'm sure I'm going about it all wrong, but I'm not sure as to get it so that it will accept the arrays input.

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