51,593 Topics
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| | I have declared a vector with 3 Dimensions with the first code below. Then I have managed to push_back all the 3 dimensions so my vector is filled up like this: vector1[2][2][2] [code] typedef std::vector<string> String1D; typedef std::vector<String1D> String2D; typedef std::vector<String2D> String3D; String3D vector1; [/code] What I now need to …  |
| | This one is on References. [url]http://publib.boulder.ibm.com/infocenter/comphelp/v8v101/index.jsp?topic=/com.ibm.xlcpp8a.doc/language/ref/cplr110.htm[/url] in the above link (from IBM), they clearly mention that a reference to a (pointer to a reference ) is not allowed.They also say that a reference to other references is not allowed. However, when i tried out both these cases in code, it … |
| | Hi all, I just wrote a small problem to check gettimeofday in a multi-cores environment. [code] int timediff(double fTimeQvs, double fTimeTcp) { int iTimeDiff; iTimeDiff = (((((int)fTimeQvs)/10000) - (((int)fTimeTcp)/10000)) * 3600) * 1000000; iTimeDiff += ((((((int)fTimeQvs)/100)%100) - ((((int)fTimeTcp)/100)%100)) * 60) * 1000000; iTimeDiff += ((((int)fTimeQvs)%100) - (((int)fTimeTcp)%100)) * 1000000; iTimeDiff …  |
| | Hi I need to find out if a specific cmd window is opened on the pc, and I need to hide it I looking for that cmd window by its name (cause i know it ) Ive used the EnumWindows with a callback function: [code] BOOL vFound=((::EnumWindows(mFindWindowOnlyByCustomTitle,0))); [/code] and this …  |
| | I think I have a memory problem since this code keeps outputting large negative numbers. The file that it reads includes- lastname, firstname, identification number, then 5 decimal numbers. ZDoes anyone know what the problem is? [CODE]#include <iostream> #include <iomanip> #include <fstream> #include <string> using namespace std; const int rows … |
| | Hai friends, I'm stuck with a input validation where if nothing is entered and enter is pressed, then i need to display a message saying please enter some value. |
| | I was spending a lot of time looking around this site to practice with beginner programs. I found one posted by sniper1. And, I tried to make it work. But, now am stuck! Can someone please tell me what is wrong with my code. Problem: 1. [SOLO] Write a program … |
 | I'm writing a program for a contest (it's a demo, not the actual thing - so I'm not cheating by asking for help - and my question isn't directly related to the algorithm they want anyway). To submit a program, you send them the .cpp file, and they execute it … |
| | This is just for my information and I don't really have much need for it... But, I would like to know anyway :D. #1. Is a for or while statement faster than one another? As in, if someone put a for would it be faster (application-wise, not when their typing … |
| | Hey, I'm just starting to learn C++ and I need some help with a header file. I'm using a Dummies Guide book and it says that I need to create a header file with the extension .h. SO I created a source file called header.h and put this at the … |
| | I have a general question. I am trying to read a file named: 1.0.0.txt but this seems not to be possible. The MessageBox shows emty. If I trying to read a file ex named: File1.txt it works. So I wonder why it is not possible to read this file named … |
| | Hello, I have seriously tried to work on this in different manners and now I am back to an infinite output. I have posted for the past 3 days and the responses have just been questions so I am not sure if this is something difficult but I really need … |
 | Hey guys, An char* to string conversion looks to be generating a segfault. I'm pretty sure that's not it, but that's when GDB says it received one... Well, here's the, what I think, relevant code. If you think more code is relevant I'll post that too of course. Entity.h (objLocation … |
| | Hello, I have a C# GUI that is supposed to call a backend I have in a C++ CLI/CLR shared library. That library calls another DLL that was created by MATLAB, but I can't get the second DLL called... Is it a mistake to put the backend in a DLL? … |
| | Quick Question. For some reason I can't figure out how to get an array of structures if I am defining the size dynamically. I can do it for a pointer i.e [CODE] struct DB { string name; int age; string ice; }; //some lines DB* data1p; data1p= new DB[no1]; [/CODE] … |
| | When can you determine if you are using too many threads? Assuming I have complete control and mutex locks and what not, when does it slow my program down, rather than speed it up by splitting up processing into sectons and passing between FIFO queues. Thanks. |
| | I have a program that deals with anagrams and for the most part the program works but on a few of the words that should be it says that they aren't and one says it is and it's not. can someone help? [code=c++] #include <iostream> #include <iomanip> #include <string> #include … |
| | Help the error states: .cpp(31) : error C2337: 'count' : attribute not found referring to new[count] = value; as the problem. My code is the following: [code] int main() { int size = 20; new double[size]; for(int count = 0; count <= size; count++) { int value; cout << "Enter … |
| | Help, I still cannot understand why the following function will not write the change to my program correctly. For my other functions (add a record and delete record, it wrote all the records perfectly to the file, but for some reason when I go to update a record it does … |
| | Hello, I'm currently helping a few ladies out setting up a dedicated server. I do not have physical access to this server. Since other people have had their hands in the server, I would like to attempt to construct a program to test several of ports to see if they … |
| | How would I add just the columns in this 2-dimensional array? [CODE]#include <iostream> #include <fstream> #include <iomanip> using namespace std; const int rows = 5; const int cols = 5; int main () { ifstream inData; int numbers[rows][cols]; int i,j; inData.open("data.txt"); while (!inData.eof()){ for (i=0; i<rows; i++) { for (j=0; … |
| | hi ppl im back here with a kinda major problem thing is i made this program for some company that sends letters or packages, and has 3 types of services: to send it the next day with priority, the next day but whithout the priority, or to send it in …  |
| | When an object is instantiated, the constructor gets called ? How is this internally implemented ? Who Calls the Constructor ? Is it the OS ? |
| | I am using a xbee rf transmission device and i have it connected to my pc via usb. As per the data of the device the information it recieves comes to the pc as it would be coming throgh a com port. I am now trying to create a program … |
| | This is cited from Stroustrup third edition [CODE] void f () throw (x2 , x3 ) { // stuff } is equivalent to: void f () try { // stuff } catch (x2) {throw; } / / rethrow catch (x3) {throw; } / / rethrow catch (...) { std: :unexpected() … |
| | hey, Just starting to learn how to use classes in c++ and when i try to split my class out of the main code and put it in a headder or a headder and a second source file dev C++ is giving me loads of errors and i dont know … |
| | how to display the value of a variable using graphics in c or c++? |
| | I am deleting a pointer using "delete" in C++. That pointer is holding the address which is used by OS like 0x00000210. What will happens? |
| | I have time to complete this, I have to add 2 void functions, 2 value returning functions, 1 structure and on array. I just need some ideas on where to start, what should I convert to functions, how should I instill stuctures and arrays to this particular program. I'm going … |
| | hi i am dipali i am trying to store multiple objects in file but it will store only one object with the help of read & write function plz tell me solution. |
| | [code=cplusplus]#include <iostream> #include <string> using namespace std; char *goodmsg = " I feel fine today \n"; string badmsg = "I am not feeling well today \n" ; int main(){ //prototype definition void printMessage( bool ); //objects declaration bool isFine; bool &isGood = isFine; char *answer = 'y'; //while loop will … |
| | Hi I'm was a c++ programmer for 7 years past with VC++ then go to Java and now return to c++ , I've search for VC++ and its seems big change now (VC++ Express Edition ) . I looking for free VC++6.0 or any other easy/free editor for c++ programming … |
| | Hi guys, I am doing multithreading in my C++ program. Now i seriously STUCK in my program.:confused: Ok, My program have 2 different base class, and each of the base class have a sub class, Example, subclass1 inherited from baseclass1, subclass2 inherited from baseclass2, HOW to make subclass1 and subclass2 … |
| | Hi, I'm just starting out with programming in C++, and would like some clarification on something.. What is the meaning of the '&' in this line: [code=c++]void Stack::push(const StackElement & value);[/code] I would assume that it takes a reference as a parameter, however, why is it that it works when …  |
| | Hi, I have a dialog box and basically I have set it so that the user can select multiple file. When it is set to just select 1 file I can get the string for the path of the file by [code] AnsiString LinkPath = (OpenDialog1->FileName); [/code] However when I …  |
| | I would eventually like to get into writing my own very simple command line OS but I am looking for maybe somewhere to start. I know C++ but I am not an expert at it and I was wondering if someone could point me in the right direction to getting … |
| | Hello all, First post here, I'll try to make it understandable heh. I have a question concerning object creation. Let's say I have a class called Node and I want to create an object called myNode. What's the difference between: [code=c++] Node * myNode = new Node(); Node myNode; // … |
| | I've been searching for a memory leak detection tool for windows, something similar to valgrind under Linux, but all tools that i find cost, or just have free trials. Does anyone know a FREE memory leak detection tool for windows ? |
| | [CODE=cpp] #include <windows.h> #include <iostream> #include "resource.h" #include "Main.h" HWND hWnd, hwScreen; CCalc szCalc; LRESULT CALLBACK MainDlgProc( HWND hDlg, UINT Msg, WPARAM wParam, LPARAM lParam ); int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd ) { DialogBox( hInstance, MAKEINTRESOURCE(IDD_MAIN), hWnd, (DLGPROC)MainDlgProc ); return 0; } LRESULT CALLBACK … |
| | I was reviewing some material over pointers in a book called [U]C++ Primer[/U] [I]4th Edition[/I] and it said there were four possible values that you can set to a pointer. [LIST=1] [*]A constant expression with a value of 0 [*]An address of an object of an appropriate type [*]The address … |
| | how do we read the memory at a particular address of a particular device. for example if i have floppy and usb plugged into my system and i want to read the information present at a particular address in usb then how i will do this??? |
 | can someone convert this c++ code to C# code... I'm very new to C# pls help the main.cpp [code=cplusplus]// Main Program // #include "square.h" // Derived Class square int main() { //******************************************************************************* cout << "\t\t\t+y"; cout << "\n\t\t\t +"; cout << "\n\t\t\t +" << "\tpoint a" << "\t\t\t\tpoint b"; cout … |
| | Hi all, I have encountered a peculiar problem when performing some simple arithmetic in a program I am developing. As the function of the program is pretty specific to my field I have included a smaller program which illustrates the same problem without the technicalities. Given a function (in the … |
| | If you were creating a graphic design drawing program for creating small images like 32x32 pixels but the windows was like 600x400. How would you create it so it could have more of a zoomed in vision of the 32x32 image so you could draw on it pixel by pixel … |
| | Hi, I'm reading Programming Windows Fifth Edition by Charles Petzold. In the part I'm reading, it talks about GDI functions. I'm trying to get the pixels that are 1 to 100 + the mouse x coordinate and the y coorinate, then draw them on my window. It's hard to explain. … |
 | Hi everyone. Here is a program I made which will find patterns in a list of primes. It does this by finding the difference between each prime and adding them to a vector like this: [CODE] Primes: 2 3 5 7 11 13 ^ ^ ^ ^ ^ Difference: 1 …  |
 | Just wanted to know, I'm just doing a little dice rolling thing thats storing dice values according to how many times they come up every so often, just wondering if instead of making 50 lines of code doing if(sum==1) { ones+=1; } else if(sum==2) {... and so on, I'm thinking … |
| | I am running a thread that does something, then sleeps for a while. If the program closes it continues to sleep to completion. How do I get it to abort immediatly, even if in the middle of sleeping? [CODE]void commThread::ThreadEntryPoint1() { while(1) { //do work Sleep(15000); //15 second sleep } … |
 | Hallo everybody. I am a student trying to extend my knowledge in cPP while using UML and system modelling. I created a "vector template class" using the rhapsody system modeling tool for storing different data types. I used the template to store int and float data types successfully using either … |
| | how are graphic's API's created such as DirectX and OpenGL. And is using GDI which is the graphic portion of the winapi, a graphic API itself? or are you able to create your own with C++ for 2D rendering instead of using anyone elses. Or does writing an API involve … |
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