176 Discussion / Question Topics
Remove Filter  | I have a difficult function to write and I have no idea where to begin. Here is the definition of what I need to write: "A function f(x,y) which returns true if the binary number formed by concatenating the bits of x, 8*y-1 zeroes and a one is prime, false … |
| | I have a function that takes a reference to an interface class as a parameter. I have created a derived class from the interface class, but when I try to call the function with an instance of my derived class as an argument I get a compiler error saying "error: … |
| | I have been teaching myself algorithms and I am stuck with the AlphaBeta AI algorithm. I want to test my knowledge of it with a TicTacToe simulation. The thing is I want it to be easy to modify for any two player game and I cannot figure out how to … |
| | I need to know where to find a tutorial on javascript assuming javascript is what I need. I want to make a dynamic website with buttons that can toggle visibility of text. Really I just need something like a link that makes a bunch of text appear then disappear but …  |
| | A friend asked me how to write and use a DLL in C++. I told him that I had to check and make sure my understanding was accurate. So here I am. Would this work as a DLL: myDLL.cpp: [CODE]#include "myDLL.h" void DLL_EXPORT ConstructMyInt(myIntStruct &i){i.val=0;} void DLL_EXPORT DoSomething(myIntStruct &i){i.val*=i.mul++;} BOOL … |
| | I am getting extra garbage at the end of the string returned by this function. Why? [CODE]char *read(char *fname) { FILE *file=fopen(fname,"r"); printf("Opening input file...\n"); if (file==NULL) return NULL; int length=0; char *ret=new char[length]; while (!feof(file)) { char ch=fgetc(file); char *temp=new char[length+1]; for (int i=0; i<length; i++) temp[i]=ret[i]; delete[]ret; if …  |
| | I am really confused as to the purpose of the unary + operator. What in the world does it do? I have tested it and it doesn't return the absolute value. Does it just return the operand? And if so what purpose is it?! (I mainly care about integer types) |
| | I have a website where I show a lot of C++ source code in tables by creating styles named, preprocessor, operator, keyword, etcetera and applying these styles where appropriate to highlight the syntax in my code. The problem is that I have so far been doing it manually. For example … |
| | I have a project that I have formatted for Doxygen. I use extra header files to hold extra classes. The thing is that Doxygen only generates documentation for the first header file. How do I get it to document all of the files I specify? |
| | I need to clear the output console buffer from within java on a windows console. I was thinking of a batch call to "cls" how can this be achieved? [CODE]public static void cls(){ //clear the screen pretty please! }[/CODE]  |
| | How do you show code on a website? Right now I define a bunch of CSS styles called Comment, Preprocessor, Keyword, etcetera. Then make a two column table, make the left column line numbers and and the right column each row has a line of code. Then I manually go …  |
| | I accidentally hit Source->Externalize Strings... on eclipse and now hundreds of string literals are stored in a properties file. I want them back scattered about my code. How can I do this without re-entering them?  |
| | I need to convert a true type font into a list of three dimensional vertices using openGL. I looked at the NeHe tutorial, but it only creates a display list from the font and as far as I can tell it is not possible for me to extract the vertices … |
| | I need to know how to extract the data in a display list in opengl. I have a font and use it to create a display list to draw, but then I want to get the actual vertexes of it so I can use them for collision checking. How can … |
| | I type using the Dvorak simplified keyboard, but I have a programming competition in a few weeks during which I have to use their keyboards, or I can plug in my own. The problem is that my keyboard is a soft-wired Dvorak keyboard (ie: The keys say dvorak letters but … |
| | Is it possible to create an array of functions in Java? Or is this not possible? |
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| | Is it possible to define a union at creation. ie: [CODE]union Colour { unsigned int i; char c[4]; struct{ char a; char r; char g; char b; }col; }Black(0xFF000000),White(0xFFFFFFFF),Red(0xFFFF0000),Green(0xFF00FF00),Blue(0xFF0000FF)/*etc...*/;[/CODE] |
| | I am VERY confused by the Doxygen configuration file. I cant seem to figure out how to make it compile code between [ICODE]#ifdef __cplusplus[/ICODE] and [ICODE]#endif[/ICODE] Also I dont understand how to change what it does with preprocessor symbols or how to make it NOT generate documentation on something. Any … |
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| | Is it possible to put a gap in a class definition? IE: [CODE]class a; class b { private: a test; public: a getA(){return test;} }; class a { private: int i; public: a(int i):i(i){} a operator+(int o)const{return a(i+o);} }; class b continued?//what? how? { void outputA(){cout<<a;} };[/CODE] This is just … |
| | What does it mean if my opengl objects are opaque from one side and translucent from another? |
| | here is the question, what does str(X) become [CODE]#define str_(X) #X #define str(X) str_(X)[/CODE] when X is a string? is it ""string"" or "\"string\""? |
| | I am extremely confused about libraries and have been having trouble understanding them with google. Basically I want to create a library so that I can use a bunch of functions from another file without all of the libraries' contents being seen. EG: library code: [CODE]class test { private: int … |
| | Is there a way to make a class visible only from within another class. i.e: [CODE]class myclass { private: class anotherclass { //stuff that only can be used from within a myclass function void dosomething(); float dosomethingelse(); }*anotherclasses; int numanotherclasses; public: int createanotherclass();//creates anotherclass object, puts it in the array … |
| | I am trying to make a static library using Code::Blocks and when I make a new static library project it generates a cpp file with functions encased with [ICODE]extern "C"[/ICODE] I am just wondering if this is necessary or if I can write the functions in normal c++ as well. |
| | I have this problem: [CODE]struct Position { float x; float y; float z; }; bool CheckCollision(Position *vertices, int numvertices, Position start, Position end) { //return true if there was NOT a collision with the polygon defined by the vertices and the vector defined by the two positions. }[/CODE] I dont … |
| | I would just like to know how x86 ASM instructions are translated into binary. EG: [ICODE]mov al,061h[/ICODE] becomes [ICODE]10110000 01100001[/ICODE] |
| | I am still having major trouble with my openGL model program. The big issue is that I cannot figure out how to debug it since I am saving the important data to the graphics chip using vertex buffer objects (VBOs) so at least as far as I can tell, I … |
| | Is it possible to use [URL="http://msdn.microsoft.com/en-us/library/45yd4tzz%28v=VS.80%29.aspx"]__asm blocks[/URL] with Code::Blocks IDE? And if so how?? |
| | If I make my own math header with similar functions as math.h, can I possibly make it as fast as the implementations of math.h, or does math.h use special hardware or something? |
| | How do I do 2D opengl? I need to be able to put stuff up on the screen so that it is not rendered in three dimensions, and I need the 3d stuff to still be 3d behind it. |
| | Quick question (though I still want to get my long OpenGL question fixed) is there a faster way to Xor the bits of an integer than this: [CODE](MyInt&0x1)^((MyInt&0x2)>>1)^((MyInt&0x4)>>2)//etcetera[/CODE] Just to clarify by faster I mean faster to execute, not to type as this operation will have to be done many …  |
| | Really quick question (I hope) before I buy Maya I want to know if it has the option of exporting coordinates for triangle vertexes rather than images. If it doesn't, is there software that would allow for modeling while exporting vertexes for 3d triangles?  |
| | I am still unable to get OpenGL Vertex Buffer Objects to work. I will just show you the code I have written so far: 3dglgui.h (I think this should be fine): [CODE]#ifndef CLASS_NAME #define CLASS_NAME "OpenGL Windows Class"//This can be overwritten to specify a unique class name #endif //Header Guards … |
| | I know that this [ICODE]#define QUOTE(X) #X[/ICODE] turns X into a c-string version of whatever is passed to it. my question is if there is a way to do this in reverse ie: [ICODE]#define DEQUOTEANDCALLFUNCTIONORCLASSWITHGIVENNAME(X) (X#)()[/ICODE] is this possible? |
| | Hello, I have been attempting to create a fast class for OpenGL's Vertex Buffer Objects. I finally got all the libraries to work and now i am getting a sigseg but cant see why. Can someone find my error? (I will keep looking too) [CODE]#ifndef GLMODELS_H #define GLMODELS_H #ifndef GOODGL … |
| | I have been away from internet connection for awhile. Anyways, I am still having library issues using VBOs. Now the only warning that I am getting is [ICODE]undefined reference to 'XXX@Y'[/ICODE] Where XXX is either CreateFont, SelectObject, ChoosePixelFormat, SetPixelFormat, GetObject, DeleteObject, or SwapBuffers and Y is a line number. What … |
| | I am looking to make a 3D game, I have made plenty of fun ones in 2D using SDL but have yet to attempt a 3D (fps style) game. Does anybody know either a way to do 3D with SDL, or some other similar or easy to use library that … |
| | I just observed an unusual phenomena in my code. I am wondering if anyone can explain it. [CODE]void dofunc(int a, int b){a+=b;} void foo(int near,int far){dofunc(near,far);}//Syntax error, expected primary expression before , and ) void poo(int vnear,int vfar){dofunc(vnear,vfar);}//Compiles fine?[/CODE]  |
| | I have reinstalled my compiler successfully (finally) and got right back to work. I have created a glModel class as follows: [CODE]class glModel { private: int numv; int numn; unsigned int model; unsigned int textu; unsigned int norma; float *vars; float *norm; public: glModel():numv(0),numn(0){vex=new float[1];tex=new float[1];nex=new float[1];} glModel& Vertex(float tx, … |
| | I am making a program and I want to be able to determine the refresh rate of the monitor somehow (to limit an fps cap). I am using windows API. Is there anyway to access this? |
| | Just wondering which of these functions would be faster (or if they would be the same): [CODE]class MyClass { private: bool MyVar; public: MyClass &Function1(bool MyVar); MyClass &Function2(bool MyVar); MyClass &Function3(bool var); }; MyClass &MyClass::Function1(bool MyVar) { this->MyVar=MyVar; cout<<MyVar; return *this; } MyClass &MyClass::Function2(bool MyVar) { this->MyVar=MyVar; cout<<this->MyVar; return *this; … |
| | Code::Blocks isn't working. I recently reinstalled to get a newer version and when I hit build I get the following error: [CODE]mingw32-g++.exe -Wall -g -I"C:\Program Files\CodeBlocks\MinGW\include" -c D:\Programming\C++\TESTINGOPENGL\main.cpp -o obj\Debug\main.o Execution of 'mingw32-g++.exe -Wall -g -I"C:\Program Files\CodeBlocks\MinGW\include" -c D:\Programming\C++\TESTINGOPENGL\main.cpp -o obj\Debug\main.o' in 'D:\Programming\C++\TESTINGOPENGL' failed.[/CODE] Please help! |
| | Is it possible to do any logic with gl lists, I am trying to make a wrapper class for them and I have this code in the compile function: [CODE] glNewList(model1,GL_COMPILE); glBegin(GL_TRIANGLES); int pos=0; for (int i=0; i<numcmds; i++) { if (cmdtype[i]=='v') { glVertex(cmdarg[pos++],cmdarg[pos++],cmdarg[pos++]); } else if (cmdtype[i]=='t') { glTexture(cmdarg[pos++],cmdarg[pos++]); … |
| | I need to make a function: [CODE]void GenerateNormal(float x[3], float y[3], float z[3], float &ox, float &oy, float &oz) { //Calculate coordinates for a glNormal and return them ox,oy and oz }[/CODE] I have a sinking feeling that the math will be quite difficult. Can anybody help me? |
| | I have been googling around and have found that the TI calculator that I use uses a z80 chip. I was wondering if it is possible to use assembly rather than the default program language of the calculator to write programs for it. Any ideas of how I could find … |
| | I am having some major issues with OpenGL textures. I have the following code to load a glTexture (typedef ed as a GLuint): [CODE]glTexture LoadBMP(const char *fname) { HBITMAP hBMP; BITMAP BMP; glTexture texid; glGenTextures(1, &texid); hBMP=(HBITMAP)LoadImage(GetModuleHandle(NULL), fname, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE ); if (!hBMP) return NULL; GetObject(hBMP, … |
| | This is a conversion question that has me stumped. I need to convert an unsigned char to a signed float. Some examples: 0xFF becomes 1.0f 0x00 becomes -1.0f 0x80 becomes ~0.0f The only idea that I could come up with was a massive switch statement. But a switch statement will …  |
| | I have the following working fine from the command line: [CODE] telnet (my email smtp) 25 helo mail from:(my email address) rcpt to:(my email address) DATA SUBJECT:(my subject) (my message) . [/CODE] This is sending me an email. My problem is that I need to emulate all of this from … |
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