C / C++ Forum

Should pre/post increment/decrement return const or non-const? What about other functions?

Hi, I'm having trouble with data types. I understand that the double data type is 64-bit, which should correspond to 15 digits(?). However, it seems from running this program that it can only handle up to 6 digits: #include <iostream> using namespace std;

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what is the code to get the value of a special character in a C++ string. Like getting the 3 character of the string "Hello world" it would be "l". also what is the code to make a string all to upper case. thanks

can i make my own file rename, delete functions. if it is the how it is possible help me

I don't know why this works: class C { public: C(int x, int y) : a(x), b(y) {} int a,b; }; float avg(const C* c) {

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When I use vector<int> vector<int*> vector<anything*> I have 3x code, or because of same size: sizeof int == sizeof any pointer I have only 1x code?

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I use a code snippet called tokenize that works quite well. But I need to modify it so it returns an empty string if two commas are found together: ie. string test="1,2,,4,5" I would like to have tokens = "1" tokens = "2" tokens = "" tokens = "4"

Hi Is there way to go to the start character of the the proceeding line while reading from a file. (Sth like working '\n' but immediately will take me one line down) Lets say; my file is abcdefghkl 123 23 43 54

Hi 1] can anyone tell me if i inherited a BASE class (with int and float as data members) then does that count into size of obj of derived class. 2] can i perform a operations like adding 2 obj and storing it's sum into 3 rd one of type struct in c++. to my knowledge it's ans is NO. but cn i use operator overloading to do this? i...

I am trying to get Directory content list in VC++ 2003, here is my code: DIR *pdir; struct dirent *pent; char str; pdir=opendir("./users/" + FullName); //"." refers to the current dir // if the dir doesnt exists, create it if (!pdir){ mkdir("./users/" + FullName);

Hi all, I have a function like: template <typename T> void f (){ T a; .... } how to call it in the main?

imagine a hollow cube. every wall can have one of two states: open or closed. This would take 6 bits to represent. Now, i allso neew to know whitch way i entered the room, this could be representet with a integer from 0 to 5 = 3 bits. As 2^6*6-1 = 383 and an 8 bit integer can hold a max value of 255, we ofcourse have to do some creative...

Hi I'm using:http://lazyfooproductions.com/SDL_tutorials/lesson03/windows/devcpp/index.php I've done everything, but still have that error: undefined reference to `IMG_Load'

how i can improve my programming skill in pointer using c++

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I am looking for C source code that can find the area of maximum square that can fit in butterfly curves.I am struck with project because of this. I would greatly appreciate if some one can help with this problem. Thanks sunnyv

I am confused about protected member functions and objects. Is there any particular advantage of declaring members protected?

Hi, All. (VC++6.0) I found some strange thins when using getline() and seekg() of std::ifstream. After the file position of an open file was shift to the end of the file, seekg() did not work rightly. (i.e. I could not move the file position to the begin or some position using seekg())

Hi, How do I kill a process in xp? It is really anoying. I have the code. I suspect that I don't have permission to do it. What is wrong with it? HANDLE hProcess; PROCESSENTRY32 pe32;

I am relatively new to C++ so this is probably a basic question: Can I overlay a class over a chuck of memory just like one can overlay a struct over memory. I need to parse a frame comming from the network hardware. Thanks, Piotr

Hello All, I'm writing cross-platform code so i'm bound to standards. Here is the code I have: ~~~~~~~~~~~~~~~~~~ double **mx = new double*; for(int i = 0; i < col - 1; i++) { mx = new double; sizeOfMx += sizeof(double) * row; }

please give me a source code to find inverse of a matrix