Well... that's it. I need something simple and reliable (doesn't have to have fancy features - I need to write and read text and numbers from Excel cells) And yes, I would like a sample "Hello Cell" code... What do you recommend? ...
I'm using the sqlite C API. "Everything" is run in the main function (variables, open, execute a query, close the database, etc.) In addition, I would like to now create separate user defined functions where I do, for example, a sort on the database. What is the best method to pass the db objects and variables from main to this new fu...
I'm working on a C-brain teaser: Write the standard Hello-World program, without semi-colons. My best answer so far is: int main(void) { if (printf("Hello World!\n"), exit(0), true) { /* do nothing */ } } But I don't understand why I don't get compiler error (Visual Studio): error C4716: 'main' : must return a v...
Wonder what the difference between: static PROCESSWALK pProcess32First=(PROCESSWALK)GetProcAddress(hKernel,"Process32First"); ... pProcess32First(...); and #include <Tlhelp32.h> ... Process32First(...); What are the differences, I wonder which I should use. Is there any difference in terms of best practices then? ...
I often use the website www.cplusplus.com as a reference when writing C code. I was reading the example cited on the page for fread and had a question. As an example they post: /* fread example: read a complete file */ #include <stdio.h> #include <stdlib.h> int main () { FILE * pFile; long lSize; char * buffer; size_t result;...
I am a professional web developer and therefore I'm used to using very high-level scripting languages and testing tools. I've recently been working, personally, more with C and writing many C programs for unix-based systems to do various tasks. However, I still haven't gotten into a good groove for unit testing this code and I was wonde...
I don't quite understand the compiling process of the Linux kernel when I install a Linux system on my machine. Here are some things that confused me: The kernel is written in C, however how did the kernel get compiled without a compiler installed? If the C compiler is installed on my machine before the kernel is compiled, how can th...
I recently embarrassed myself while explaining to a colleague why char a[100]; scanf("%s", &a); // notice a & in front of 'a' is very bad and that the slightly better way to do it is: char a[100]; scanf("%s", a); // notice no & in front of 'a' Ok. For everybody getting ready to tell me why scanf should not be used anyway for securi...
Can anyone explain to me why this isn't working? #include <stdio.h> #include <stdlib.h> char *getline(int lim) { char c; int i; char *line; line = malloc(sizeof(char) * lim); i = 0; while((c = getchar()) != '\n' && c != EOF && i < lim-1) { *line = c; line++; i++; } *line = '...
My question is about when a function should be referenced with the extern keyword in c. I am failing to see when this should be used in practice. As I am writing a program all of the functions that I use are made available through the header files I have included. So why would it be useful to extern to get access to something that was...
I'm working on a project that is supposed to be used from the command line with the following syntax: program-name input-file The program is supposed to process the input, compute some stuff and spit out results on stdout. My language of choice is C++ for several reasons I'm not willing to debate. The computation phase will be highly...
Is there a function to round a float in C or do I need to write my own? float conver= 45.592346543; Would like to round actual value to one decimal place. conver = 45.6 Thanks. ...
I'm trying a little concept test to change one of the features of the logitech MS3200 keyboard (the zoom feature). I've got the keys that are sent from the zoom control. So, I have a main app, and a dll that contains a hook procedure. Here's the main app: #include <stdio.h> #include <windows.h> HANDLE hHook; int main() { HINSTAN...
Hi, What I'm trying to do is to convert a double to hex string and then back to double. The following code does conversion double-to-hex string. char * double2HexString(double a) { char *buf = new char[17]; // double is 8-byte long, so we have 2*8 + terminating \0 char *d2c; d2c = (char *) &a; char *n = buf; int i; f...
Is it possible to create a FIFO 'stack' in C without using 2 stacks? Thanks! (Sorry to those who answered the previous one. I was thinking LIFO and meaning FIFO.) ...
I am trying to change the keys my keyboard sends to applications. I've already created a global hook and can prevent the keys I want, but I want to now send a new key in place. Here's my hook proc: LRESULT __declspec (dllexport) HookProc(int nCode, WPARAM wParam, LPARAM lParam) { int ret; if(nCode < 0) { return CallNex...
Although people seem to like to complain about C++, I haven't been able to find much evidence as to why you would want to choose C over C++. C doesn't seem to get nearly as much flak and if C++ has all these problems why can't you just restrict yourself to the C subset? What are your thoughts/experience? Exact Duplicate: What's the ad...
I have this problem where if I read a book such as the K&R, I become fearful that I haven't learnt enough, until I've done all the exercises it asks of me; The K&R is a difficult book to many (C is a first language here), did you do and complete all exercises in the book? And if you didn't, are they all necessary in becoming competent ...
So I'm in Linux and I want to have a program accept arguments when you execute it from the command line. For example, ./myprogram 42 -b -s So then the program would store that number 42 as an int and execute certain parts of code depending on what arguments it gets like -b or -s. ...
I just stumbled on Protothreads. They seems superior to native threads since context switch are explicit. My question is. Makes this multi-threaded programming an easy task again? (I think so. But have I missed something?) ...