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Almost Uni Student.
156 Posted Topics
 | I don't get why you use fgets. If it's an ASCII file, and it should be for the thing you're trying to do, all you need to do is strstr(buff, find) and then memcpy. Not strcpy, in an ASCII file aren't any NULL bytes. Well, not that I know of. …  |
| | Sorting any type of data with use of the STL: [url]http://www.cplusplus.com/reference/algorithm/sort/[/url] Which may be a bit too much for 3 strings, but you'll know how to sort 2000 too! :D  |
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| | [code=cpp] newnode = new Node; newnode = NULL; [/code] Eerrrr? That's a bit of weird code. You're trying to derefence that pointer on the next line! ;)  |
 | Hey guys, Here's my story: I had a HDD: Data, ~300GB I created a partition for another OS I'm done with the OS, remove the partition Now, it shows up as unallocated, and I can't find a way to merge it back to the drive it belongs to! A screenshot …  |
| | Here you go: [url]http://www.xmission.com/~nate/glut.html[/url] If you're on windows that is. Else, you need to download glut.h from somewhere else for Linux.. don't know much about linux, sorry. |
| | Hey guys, I know the title isn't possible, but I'd like to here how you'd do it then. Suppose we have this code: [code=cpp] Class Foo {public: int x; }; //somewhere in the code.. int main() Foo one, two; one.x = 10; two.x = 20; Foo *a = &one; Foo …  |
| | Hey guys, I have this code snippet: [code=cpp] template <typename ElementType, typename CompareClass> struct Delegate { virtual bool geef(const ElementType &element){ pair <set<ElementType, CompareClass>::iterator, bool> ret; //this is line 196 ret = elements.insert(element); //197 return (ret.second); //198 } virtual void output() = 0; set<ElementType, CompareClass> elements; }; struct ArtiestenPrinter : … |
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| | [code=cpp] #include <cstdio> using namespace std; void testing(const void *buf){ puts((char*)buf); } int main() { char *x = "somebytes"; testing(x); return 0; }[/code] That works here, does that small program also work for you?  |
| | Hey guys, I'm trying to create an MSCache (2 times MD4) cracker. I took the RFC thingy and implemented it in a cracker which is.. fast, but not as fast as I'd like it to be. So I searched a bit and stumbled on MDCrack, which claims it can do … |
| | This might come in handy as well: [url]http://www.cplusplus.com/reference/std/typeinfo/type_info/[/url] |
| | Hey guys, Can I tell istream to ignore ALL the characters until the delimiter char? It can be done with a loop but it's kinda weird I can't tell istream "discard until this char" imho, so maybe there's an hidden option somewhere. Thanks in advance! |
| | What wildgoose gives as a solution is called a "forward declaration", so you can read up about it (where what why how etc.) And yes, Pancake stacks are most of the time FILO ones. xD ;) |
| | You can't call calc() in the product class. calc() isn't implemented in the Product class! ;) What you're doing in the ctor is basically: [code=cpp] Product :: Product (...) { this->price = this->calc (); } [/code] And since "this" in that context is a Product*, you can't call calc().  |
| | Hey guys, So I have compiled my first home-written static library (named PixGUI) that happens to call OpenGL functions. However, I noticed that when compiling (using MinGWs GCC with Code::Blocks project set to "static library") it doesn't matter whether I supply the linker with libopengl32.a or not, it simply compiles … |
| | Hey guys, Below code isn't working as I expect it to do. I expect it to read all params when 6 are given, buuuuuuuuuuuut it only reads one, the rest remains zero. It does enter the case, but the stringstream buf seems empty. What am I doing wrong? [code=cpp] #include … |
| | Hey guys, What am I doing wrong here? sss.hpp [code=cpp] #include <fstream> #include <string> #include <map> namespace sss { using namespace std; class node { public: multimap<string, string> values; multimap<string, node> children; string &value(const string name, size_t index = 0); node &child(const string name, size_t index = 0); private: template … |
| | Hey guys, How would I partially specilize a template in a manner as below? Is that even possible? I have these two functions: [code=cpp] bool node::read(const char *filename) { ifstream f(filename); if (!f.good()) return false; bool success = read(f); f.close(); return success; } bool node::write(const char *filename) { ofstream f(filename); … |
| | Hey guys, I have a class with a friend function and a member function with the same name. Calling the friend function from the member function gives me an error: it looks for <classname>::<function> while the friend function is of course simply <function>. In this case, MinGW GCC says: [code] … |
| | Hey guys, With this defintion: sss.hpp [code=cpp] #include <fstream> #include <string> #include <map> namespace sss { using namespace std; class node { public: multimap<string, string> values; multimap<string, node> children; string &value(const string name, int index = 0); node &child(const string name, int index = 0); //... }; typedef pair<string, string> …  |
 | Is it a Windows handle, the one in windows.h? It's not an initializer, it's what int and char are: a type. If it's a window handle, it's basically as specific as a pointer. A pointer used by windows to keep track of resources, varying from windows (window handles) to files … |
| | Re: Compiling C++ It doesn't compile in MinGW's GCC. Looks like MSVC code? I'm getting these errors: [code] =| sdvrp.h|18|warning: ignoring #pragma warning | sdvrp.h|222|warning: no newline at end of file| genius.cpp||In function `double genius(route*&, Nb&)':| genius.cpp|732|warning: comparison between signed and unsigned integer expressions| genius.cpp|733|warning: comparison between signed and unsigned integer expressions| genius.cpp|736|error: …  |
| | Hey guys, I got this code, and I can't get it to compile, no clue what I'm doing wrong. [code=cpp]#include <iostream> #include <vector> #include <iterator> using namespace std; template <class T> void kill_dupes(vector<T> &x){ vector<T> y; for(vector<T>::iterator it = x.begin(); it != x.end(); it++){ if(find(x.begin(), x.end(), *it) == x.end()){ y.push_back(*it); …  |
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| | Hi guys, What am I doing wrong here? Program dies on me @ merge(). :( [code=cpp]#include <iostream> #include <vector> using namespace std; int main() { int afrom[4] = {0,0,1,2}; int ato[4] = {1,2,3,4}; vector<int> from(&afrom[0], &afrom[4]); vector<int> to(&ato[0], &ato[4]); vector<int> length; vector<int> all_nodes; sort(from.begin(), from.end()); sort(to.begin(), to.end()); merge(from.begin(), from.end(), to.begin(), … |
| | Re: C++ Rational Your overloaded >> is a bit complicated, here's a simpler version: [code=cpp]int main() { int nom, denom; string buf; getline(cin, buf); stringstream ss(buf); ss >> nom; //discard all the remaining chars, stop when / is found ss.ignore(ss.str().length(), '/'); ss >> denom; cout << "Read: " << nom << "/" << … |
| | Does this code compile for you? [code=cpp]int main(){ size_t cols = 10; cin >> cols; size_t rows = 20; cin >> rows; char x[cols][rows]; for(int i = 0; i < rows; i++){ for(int n = 0; n < cols; n++){ cout << x[i][n]; } cout << endl; } return 0; … |
| | Tux4life is right, you can't delete one element of an array in C(++). Either use a vector or do as tux4life said. |
| | This'd work. [code=cpp] string filepath; getline(cin, filepath); ifstream fis(filepath.c_str()); [/code] |
| | You can look all that info up in a STL List reference, as the one found here: [url]http://www.cplusplus.com/reference/stl/list/[/url] See the "STL Algorithms" for sorting data inside STL containers. |
| | My goal is to create a program that plays Mahjong. I figured the algo would be a bit like this: [code] While there are blocks left { Fetch new board Recognize blocks //find 2 of the same images within the image. Find free blocks //not *really* necessary: computer versions don't … |
| | So, what doesn't work? edges.open(); ? Double check the filepath please, hehe. Code looks okay, you won't need to clear it, unless errors occurred and you've recovered from them (or just want to reset them of course). |
| | [quote=halfnode]is it possible to put a constructor into an array?[/quote] Yes, take a look here for an example: [url]http://www.daniweb.com/forums/post847675-7.html[/url] The size specifier for the array (base* [[b]3[/b]]) is not necessary, but it will make sure the array is of size 3 of course. |
| | Header files such as string need to be included in the header file and in the .cpp file. We call these 2 files (header and .cpp) the definition of a class and its implementation when used to form a class. If you want more help, ask more questions, but try … |
| | [code=cpp] while(!inFile.eof()) { // use getline to read entire line getline(inFile, s); cout << s << endl; }[/code] That's wrong code. eof gets set when it has read eof, so and in that case getline() won't do a thing, so you'll output the last output twice (possibly). Correct code: [code=cpp] … |
| | [code=cpp]class Client { public: string name; Menu order; int table_number; string type; double bill; Client(void) { name=""; table_number=0; type=""; bill=0.0; } }; [/code] This code lacks the virtual addClient table wants to use. Another note: is a table a client? If not, you shouldn't have inheritance, but perhaps composition. |
| | No, [code=c] if(*n == ' '); [/code] |
| | So this should not be in a loop? [code=cpp] for (char *p = a; p!= fixPtr; p++) { *p=toupper(*p); }[/code] Why not do something like: [code] Set first letter to uppercase. Rest to lowercase [/code] with [code=c] void fixAddress ( char *a ) { a[0] = toupper(a[0]); for (int i … |
| | Oh hey look, it's free knowledge! [url]http://en.wikipedia.org/wiki/Sorting_algorithm[/url] |
| | So, you know what you have to do, do it. :) [code=cpp] class invoice { ... }; [/code] Something like that. |
| | [code=c] const int MAX = 13; int a[MAX]; for (int i = 0; i < MAX; ++i) a[i] = i; for (int i = 0; i < MAX; ++i) { int r = rand() % MAX; while(r == i) r = rand() % MAX; int t = a[i]; a[i] = …  |
| | Hurr, it might be a really stupid "error". One time (at band camp, xD) I was trying to open a file from an app I wrote in Code::Blocks on windows. So I put that file in project/bin/debug/, but code::blocks launched it in project/, so it couldn't find the file. Try … |
| | Hey guys, How do you handle exceptions in your programs? For instance, I have this function: [code=cpp]bool load_file(const char *filepath, std::string &dest) throw (std::bad_alloc, std::runtime_error) { using namespace std; ifstream file; file.open(filepath, ios::binary); if (!file.good()) { throw runtime_error("Couldn't open the file"); } //get filesize in bytes from ifstream //seek end, … |
| | If you're standing in queue line at the grocery shop, does the LINE look like a tree, with intersections and such, or more like an array of (possibly annoyed) customers? I sure hope it doesn't look like a tree. |
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| | So, what doesn't work? Check here for more info on templates: [url]http://www.cplusplus.com/doc/tutorial/templates/[/url] |
| | Re: array help Give it a shot here: [url]http://www.cplusplus.com/doc/tutorial/[/url] When you're stuck on a tutorial, you can ask for help of course. |
| | [quote=MrSpigot]main() is just reading it, so no protection is necessary in this case.[/quote] That's wrong, almost 100% sure, couldn't make sure with google, but it's just 2 threads trying to access the same memory: doesn't matter if they read or write, both will lead to errors. Agreed on not using … |
 | It's a slash in (/code), not a backslash. But A for effort. :D And you can supply the language as well, (code=cpp) Your code looks okay, but it looks a lot like C: it's not using OOP. Which would be a nice approach for a board game. My output looks … |
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