General C++ Programming - C++ Forum - January 2010 (Page 10)

is there something similar in c++ to realloc in c ?

[4 replies] Last: You also have the allocator class although I'm not sure if that's what... (by tummychow)

I just started C++ 1 week ago and i was wondering what is the correct syntax to use 2 variable as conditions for example: int main() { char Yes, No; cout<...

[6 replies] Last: @PanGalactic : THX!! That's exactly what i needed and also thx to all... (by Infernochaos)

by paul23

functors, and changin them "on the run"

Well let me first show the code: #include <iostream> #include <functional> #include <cmath> class generic_dis { public: virtual double operator() (const...

[3 replies] Last: Close but don't forget the reference/pointer part--it is the key. H... (by moorecm)

by haraz471

matrix looping//

i have this problem programming i dont know how to start,,, our teacher asked us to make a program that can solve n by n matrix..i guess we should use looping f...

[1 reply] : Use two nested for (by Bazzy)

by jonnyw

How to split a byte into bits so you can check whether bit X is 1 or 0

Hi everyone, Can someone please explain to me how can I split a byte into separate bits? I want to check whether a particular bit is 1 on 0. For example,...

[1 reply] : unsigned char byte = something; bool fiftDigitIsOne = byte & 16 // 1... (by Bazzy)

by jrohde

Thread Priority Question

Hello all, Just curious about the nature of thread priority. I currently use Win32 threads, but I suppose this would apply to any API or OS: In a file sp...

[4 replies] Last: 1. It does matter what priority your thread has. Does it? When all ... (by ktoto256)

by Nikhar

Suggest a good tutorial for graphs in c++

Hi... I'm trying to study graphs but I cant find a good tutorial on it. I googled it, but couldn't find what I needed. Can you please suggest me a good tu...

[1 reply] : Oh, btw I'm using XP and the compiler is Code::blocks. (by Nikhar)

by n4nature

reserve() in vectors

int main() { vector<int> v1; v1.reserve(100); } Does "v1.reserve(100)" above actually allocates memory for 100 integers and calls constructor o...

[3 replies] Last: Constructors are not called. (by helios)

by rey

source code assistance pls

Need your kind expert advice. I have to come out with a programme in C++ but I have no idea how to make it, really hope that anyone of you here can help me. the...

[2 replies] Last: ok noted. (by rey)

by rijaalu

print empty screen when i compile.

Hello can some one help with this code . when ever i run this code it will print Teacher: press any key to continue..,, This is the code #i...

[2 replies] Last: As far as I can tell the code is working just fine, you're creating a ... (by Warnis)

by yag

Which C++ compiler to use?

I have Windows vista OS and i want C++ compiler to work with. Please suggest which one i can download ?

[13 replies] Last: Well if you are really serious try actually buying a piece of software... (by kevinkjt2000)

by phaethon

PCI Express I/O

Newbie here.. was hoping someone could give me some information on how to conduct reads/writes across a pci express interface to/from memory locations on a main...

[2 replies] Last: I'm not actually a C++ newbie, just a newbie to this forum :-P My exp... (by phaethon)

by Leomond

Creazy Behavior

Ok, this code is executes around 6 hundreds times at the start of the application, as it's related to a parser used by a group of classes when they are initiali...

[3 replies] Last: Just blind luck, I guess. Everything would work out fine if the next ... (by moorecm)

by gipark

memory problem on 3D array - segmentation fault

I want to make a big 3D array called u3d, so I declared it with the following sentence: nx=4096; ny=400; nz=129; double u3d ; C++ repeatedly give...

[2 replies] Last: Dynamically allocate the array. Depending upon the OS you'll have com... (by iharrold)

by Bazzy

Odd Constructor Syntax

I've found out that on g++ the following code compiles: struct Foo { ****const****const****& Foo() {} }; I can put as many * and const as I wan...

[4 replies] Last: I like playing with things ( until I eventually break them... ) So I'... (by Bazzy)

by majidkamali1370

reading from ports.

Hello. What is "inport(int portid)" in conio.h ? How it works ? What is portid ? Thanks.

[1 reply] : Computers communicate with external devices (printer, keyboard, intern... (by Duthomhas)

by slavik262

conveting jpeg in memory buffer to bitmap

Hi all. I’m in a robotics program (FIRST Robotics) and my team’s robot has a webcam attached to it. Using the API provided by the FIRST organization that ...

[1 reply] : Hello slavik262, When working with webcams a very good library... (by Leomond)

by billinares

.lib & .a extensions

Hello Does anyone know the difference between libraries with .lib and those with .a extension? I use Eclipse CDT for coding. A library compiled with Eclip...

[1 reply] : The .a is almost certainly a static library. It's a Unix convention. ... (by kbw)

by closed account S6k9GNh0

TinyXML

I can't tell if I'm not getting the grand idea from XML or what but I'm confused as hell. I spruced up some code for one of my games to load through an XML conf...

[5 replies] Last: Look into boost::spirit. I'm pretty sure there is an example program ... (by moorecm)

by sebas

problems with calloc

Hi everyone! I'm trying to allocate memory for a matrix. I know the standard calloc use e.g double *Sigma=(double *)calloc(2*Nxfm+2*Nyfm,sizeof(double)); ...

[2 replies] Last: Thanks jsmith! Now I see the point. (by sebas)

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General C++ Programming - January 2010 (Page 10)