Possible Duplicate: System of linear equations in C++? I have the following 2 systems of equations: For a,b,c,d: 0 = a * r1_x + b * r1_x * r1_y + c * r1_y + d 1 = a * r2_x + b * r2_x * r2_y + c * r2_y + d 0 = a * r3_x + b * r3_x * r3_y + c * r3_y + d 1 = a * r4_x + b * r4_x * r4_y + c * r4_y + d For e,f,g,h: 0 = e * r1_x ...
I am learning C programming and I have a simple question about pointers... I used the following code to play around with pointers: #include <stdio.h> int main (int argc, const char * argv[]) { int * c; printf("%x\n",c); return 0; } When I print the value of C, I get back a 0. However, when I print &c (i.e. printf("&x\n",&c) I get ...
Is is possible in C to create structs “inline”? typedef struct { int x; int y; } Point; Point f(int x) { Point retval = { .x = x, .y = x*x }; return retval; } Point g(int x) { return { .x = x, .y = x*x }; } f is valid, g not. Same applies to function calls: float distance(Point a, Point b) { return 0.0; } int ...
In turbo c++, we can use getch() function available in conio.h. But in linux, gcc compiler doesn't provide conio.h header file, then how to get functionality of getch() function? ...
Can you tell me is there any thing wrong in the code, my application is crashing randomly I cannot find any possible logical or memory error, please help as this is going out of my scope. #define __FN__ "CGD9_gd_ParseAddFieldsProC" int CGD9_gd_ParseAddFieldsProC (CGD_gd_ParseAddFields_Iparam_t *i_param_st_p) { t_gd9adfld_t *p_ext_fi...
I'm currently going through K.N. King's C Programming: A Modern Approach. I've made it past the text for the 8th chapter (Arrays), and I'm eager to move on to chapter 9, but I've yet to solve the so-called "programming projects" at the end of each chapter. Unfortunately, the 14th... bugs me. Write a program that reverses the words in...
I have some code that runs fairly well, but I would like to make it run better. The major problem I have with it is that it needs to have a nested for loop. The outer one is for iterations (which must happen serially), and the inner one is for each point particle under consideration. I know there's not much I can do about the outer on...
How can access the lower half of a 64bit integer using C or C++? I can do it easily in Assembly but I have no clue on how to do it in C/C++ EDIT: What about accessing the upper half? ...
Hi, I'm trying to multiply A*B in 16-bit fixed point, while keeping as much accuracy as possible. A is 16-bit in unsigned integer range, B is divided by 1000 and always between 0.001 and 9.999. It's been a while since I dealt with problems like that, so: I know I can just do A*B/1000 after moving to 32-bit variables, then strip back to...
Say I have fancy new algorithm written in C, int addone(int a) { return a + 1; } And I want to deploy as a web application, for example at http://example.com/addone?a=5 which responds with, Content-Type: text/plain 6 What is the best way to host something like this? I have an existing setup using Python mod_wsgi on Apache2,...
Hi, I'm coding a task monitoring, which updates tasks' progress using cout. I'd like to display one task progress per line, therefore I have to rollback several lines of the console. I insist on "several" because '\b' does the job for one line, but does not erase '\n' between lines. I tried std::cout.seekp(std::cout.tellp() - str.leng...
Hi all, I am writing a programing (in C) in which I have to access data from another computer through an SSH connection. I was wondering how to create the SSH connection within the program. Thanks ...
Possible Duplicate: Whats the advantage of using C over C++ or is there one? Hello all. I was wondering why so many people continue to code in C when C++ has now been out for such a long time. What advantages/disadvantages are there?? I heard that there are differences (ie. advantages to C) in the way that linking is done, b...
Possible Duplicate: Could anyone explain these undefined behaviors (i = i++ + ++i , i = i++, etc) My code is as follows: #include <stdio.h> int main() { int x = 10, y = 0; x = x++; printf("x: %d\n", x); y = x++; printf("y: %d\n", y); } Given the nature of post-increment, I would expect the following output: x: 10...
I have a relatively complicated lexer problem. Given the following input: -argument -argument#with hashed data# #plainhashedData# I need these tokens: ARGUMENT (Text = "argument") ARGUMENT (Text = "argument") EXTRADATA (Text = "with hashed data") OTHER (Text = "#plainhasheddata#") I've been able to take care of the text manipulatio...
I want to extract x509 cert and private key from pkcs12 file using a C lib. I found lot of .net utils to do this, but did not find any C libraries. My code will run in WinPE environment, so .net will not work. ...
Is there a way to get the destination MAC address, if the destination IP is known, using ANSI C? I would preferably do it with a system call so the kernel deals with it all and I can take advantage of the ARP cache. I know I can build and send my own ARP request, but then I would not have the caching functionality etc unless I implement ...
why do these blocks of code yield different results? some common code: #define PART1PART2 works #define STRINGAFY0(s) #s #define STRINGAFY1(s) STRINGAFY0(s) case 1: #define GLUE(a,b,c) a##b##c STRINGAFY1(GLUE(PART1,PART2,*)) //yields "PART1PART2*" case 2: #define GLUE(a,b) a##b##* STRINGAFY1(GLUE(PART1,PART2)) //yields "works*"...
I want to call one command(user defined) from C program(Windows). Can you tell me the function available? ...
Hi, I am defining some values in the preprocessor. e.g. #define a 1000 #define b 0.5*a when I try to use b in a place where integer is needed I get an error. I don't want to cast b always in my code and do it once in the #define line, is that possible? ...