49,761 Topics
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| | Hi I m trying to create a map of STL which has set as one of it's element. Following is snippet of my code [code=c] .. std::map<std:string,std::set<int,int> > map_of_set; int a=9; int b=10; std::string str="test"; map_of_set.clear(); map_of_set.insert(test,9,10); //This gives compilation error [/code] kindly help  |
| | This program needs to read the infile and calculate the temperatures for each function. I can only get it to output 0's. Can someone explain the steps needed to make this code work correctly? What am I missing? Should I be passing by reference? If so how?? [ICODE]#include <iostream> #include … |
| | 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? |
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