Hello, I have a problem that consist in comparing boolean expressions ( OR is +, AND is * ). To be more precise here is an example: I have the following expression: "A+B+C" and I want to compare it with "B+A+C". Comparing it like string is not a solution - it will tell me that the expressions don't match which is of course false. Any i...
char in[100], *temp[10],var[10][10]; int i, n = 0, double val[10]; var[0][]="ANS"; I want to assign a string to var[0][0,1,2] which is 'ANS', but does not work and i cannot figure where i am wrong about this ...
Hello everyone: I'm now trapped by a performance optimization lab in the book "Computer System from a Programmer's Perspective" described as following: In a N*N matrix M, where N is multiple of 32, the rotate operation can be represented as: Transpose: interchange elements M(i,j) and M(j,i) Exchange rows: Row i is exchanged w...
I think the title says it all, however, I'll expand a bit. Is there a difference between having the following code at the begining of program 'progX' if(daemon(0, 0) == -1) { printf("daemon error: %s", strerror(errno)); } or running 'progX' via the command: progX & 2>/dev/null 1>/dev/null 0>/dev/null ...
What is the C equivalent of C++ delete[] (char *) foo->bar; Edit: I'm converting some C++ code to ANSI C. And it had: typedef struct keyvalue { char *key; void *value; struct keyvalue *next; } keyvalue_rec; // ... for ( ptr = this->_properties->next, last = this->_properties; ptr!=NULL; last = ptr, ptr = ptr->ne...
How can i write an if statement which tells to the program if the pointer is assigned or not? WRONG example if (*badpdr[0]==0); ?? ...
I have external app reading files, I want to hook that to get event in my app. But I cannot find a sources hooking ReadFile (or something else that can help me achieve that). Any ideas how to do that? It must be done in User-Mode. I was thinking for something similar to Process Monitor. I wonder how it does it.. ...
Possible Duplicate: Examples of good gotos in C or C++ What uses of the goto statement do you consider acceptable? I am discussing some coding guidelines for C embedded work, and wondering if there are cases where goto is the cleanest way to do things. ...
Hi, I am working on some C code. There is a function like this; void Get(double x_la[], double y_la[], double z_la[]) in the function body, for some other reasons I create; double (*la)[3]; As far as I understood, x_la, y_la and z_la are pointers of the type double. I need to "connect" the pointers involved in "la" wiht the p...
My initial UDP socket is binded to 127.0.0.1:9898. The first time that I get notified of incoming data by epoll/kqueue, I do recvfrom() and I fill a struct sockaddr called peer_name that contain the peer informations (ip:port). Then I create a new UPD socket using socket(), then I bind() this newly created socket to the same ip:port (...
I am really new programming in C. How can I do the same in C, maybe in a more simple way than the one I do in Java? Each line of the input has two integers: X and Y separated by a space. 12 1 12 3 23 4 9 3 InputStreamReader in = new InputStreamReader(System.in); BufferedReader buf = new BufferedReader(in); int n; int k; double sol...
I have a struct with an array of 100 int (b) and a variable of type int (a) I have a function that checks if the value of "a" is in the array and i have generated the array elements and the variable with random values. but it doesn't work can someone help me fix it? #include <stdio.h> #include <stdlib.h> #include <time.h> typedef str...
In an embedded C app, I have a large image that I'd like to rotate by 90 degrees. Currently I use the well-known simple algorithm to do this. However, this algorithm requires me to make another copy of the image. I'd like to avoid allocating memory for a copy, I'd rather rotate it in-place. Since the image isn't square, this is tricky...
Hey all :) I have a problem my src pointer of memcpy is pointing wrong. unsigned char* lpBuffer is a buffer that contains my bytes, i checked with olly. The code: IMAGE_DOS_HEADER iDOSh; memcpy(&iDOSh,lpBuffer,sizeof(iDOSh)); The problem is that lpBuffer points wrong, output from debugger is dest = 002859E8 RIGHT src = 000001D8 ...
I'm trying to do a couple of things at once. I'm trying to do one major thing: redirect the application output that is displayed in the Qt Creator console to a textEdit that I have on my GUI. However, the class that I need to do this in is written in C and all of its related headers are in C as well. Is there a way that I can redirec...
Modern keyboards have special multimedia keys, e.g. 'Pause/Play' or 'Open Web Browser'. Is it possible to write a program that "presses" these keys? I would prefer solution in C, but I would accept a language agnostic solution, too. ...
How can I make GNU Make use a different compiler without manually editing the makefile? ...
How to create a script to : compare two trees, in c/c++ in a non recursive mode? also, How to create a script in c/c++ to verify if a tree is binary, in a non recursive mode? thanks in advance. ...
int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout); I'm a little confused about the maxevents parameter. Let's say I want to write a server that can handle up to 10k connections. Would I define maxevents as 10000 then, or should it be be lower for some reason? ...
I have this code: #include <stdio.h> #include <wchar.h> int main() { wchar_t *foo = L"ðħ"; wprintf(L"[%ls]\n", foo); return 0; } And when I compile it, it gives me the implicit declaration of function ‘wprintf’ warning. I know that I should link the wchar library during compilation, but how do I do that? ...