what is concerned best practice regarding the following "pattern"? #ifndef BLAFOO_H #define BLAFOO_H /* ... * ... */ #endif /* BLAFOO_H */ how should i name the header in the #define directive? i've seen all from said BLAFOO_H to __BLAFOO_H to _BLAFOO_H_ etc.. ...
I have plenty of RAM, however, after starting and finishing a large number of processes, it seems that most of the applications' virtual memory has been paged to disk, and switching to any of the older processes requires a very long time to load the memory back into RAM. Is there a way, either via Windows API or via kernel call, to get ...
I'm learning basics of C and writing a simple first order equation solver. I want the input to be exactly ax+b=c or ax-b=c, where a, b, c are double type. I'm employing scanf() to read in user input and to check if it's of the correct form. However, if I enter a negative double, -4.6 say, as the "a" in the equation, scanf() won't read t...
Hi! all, I am writing an application which is a kinda video streamer.The client is receiving a video stream using udp socket.Now as I am receiving the stream I want to play it simultaneous.It is different from playing local video file lying in your hard disk in which case it can be as simple as running the file using system("vlc filename...
What of these two methods is in C more efficient? And how about: pow(x,3) vs. x*x*x etc? ...
In C++, if an object of a class is passed as a parameter into a function, the copy constructor of the class will be called. I was wondering if the object is of nonclass type, what function will be called? Similarly in C, what function is called when passing values or address of variables into a function? Thanks and regards! ...
hello. Disclaimer, I not do anything in particular with regards this question, just curious. Is it possible to take address of instruction or block in C? in essence, is there jump equivalent in C? for example: void function() { int k; { // is a possible to go to this address from arbitrary point in code? int i, j; ...
Hey everyone, I need to write a C program that will allow me to read/write files that are owned by root. However, I can only run the code under another user. I have the root password, but there are no "sudo" or "su" commands on the system, so I have no way of accessing the root account (there are practically no shell commands whatsoever...
So I have some temp data in my program (in RAM). I want to somehow make it seem as it is a file (for example for sending it into another program which takes a file link as argument)? Is it possible? How to do such thing? ...
How to encode RBG images into H264 frames (Keyframe + some dependent frames)? So I created some images how to turn them into H264 now? ...
I'm making an iPhone game where the main actor is a ball that rolls depending on the device's accelerometer rotation. I haven't started on this part of the coding yet, but I was wondering if you guys had a nice way of solving this: I tried looking a little into chipmunk, and I noticed that bodies have the property v, which is a point c...
I've noticed that in c/c++ a lot of Win32 API structs need to be told how big they are. i.e someStruct.pbFormat = sizeof(SomeStruct) Why is this the case? Is it just for legacy reasons? Also any idea what "pb" stands for too? EDIT: oops, yeah I meant "cbFormat" ...
Ideally the following code would take a float in IEEE 754 representation and convert it into hexadecimal void convert() //gets the float input from user and turns it into hexadecimal { float f; printf("Enter float: "); scanf("%f", &f); printf("hex is %x", f); } I'm not too sure what's going wrong. It's converting the...
I would look this up, but honestly I wouldn't know where to start because I don't know what it is called. I've seen variables passed to functions like this: myFunction((void**)&variable); Which confuses the heck out of me cause all of those look familiar to me; I've just never seen them put together like that before. What does it mea...
what would be a good way to hash the ISBN of a book? sorry for the confusion let me clarify, I want to hash the ISBN of books of size 1000. but the array might grow. its a hash table not encryption. the programming language is c but this is a general question. I want to know the standard hashing method for ISBN used in the industry or y...
Can any of you suggest a good and stable echo cancelation package (gnu or not) to be linked with my videoconference application (C/C++) (Windows / Linux / MacOSX) ? My application should be freeware, so i do not want to pay for each user who download the app. ...
Gday, I am trying to create a tiled map for my game, i have had this previously working using other xml methods but i had memory leaks and all sorts of errors. However i had a map load time of about 2.5 - 3 seconds. So i rewrote all of the code using NSMutableStrings and NSStrings. After my best attempt at optomizing it i had a map load...
Is there a way to tell gcc to throw a SIGFPE or something similar in response to a calculation that results in NaN or (-)inf at runtime, like it would for a divide-by-zero? I've tried the -fsignaling-nans flag, which doesn't seem to help. ...
I have written some C/C++ extension modules for PHP, using the 'old fashioned way' - i.e. by using the manual way (as described by Sarah Golemon in her book). This is too fiddly for me, and since I am lazy, and would like to automate as much as possible. Also, I have used SWIG now to generate extensions to Python, and I am getting to li...
Hi, I'm iterating over a 3 dimensional array (which is an image with 3 values for each pixel) to apply a 3x3 filter to each pixel as follows: //For each value on the image for (i=0;i<3*width*height;i++){ //For each filter value for (j=0;j<9;j++){ if (notOutsideEdgesCondition){ *(**(outArray)+i)+= *(**(pix...