C Compatibility Between Integers and Characters
How does C handle converting between integers and characters? Say you've declared an integer variable and ask the user for a number but they input a string instead. What would happen? ...
c
Up-To-Date Libnet Tutorials
I've googled around for a while trying to find a good libnet tutorial but most of them appear to be out of date or lacking on good code examples. What do you recommend for learning libnet? I'm also having problems compiling programs using the libnet headers; what's the flag(s) needed for this? ...
What's the best way to serialize data in a language-independent binary format?
I'm looking into a mechanism for serialize data to be passed over a socket or shared-memory in a language-independent mechanism. I'm reluctant to use XML since this data is going to be very structured, and encoding/decoding speed is vital. Having a good C API that's liberally licensed is important, but ideally there should be support f...
Learn C from Open Source code
I've tried a couple of times to teach myself to program in C using books, but haven't had the patience to progress through all the mundane examples. I have experience of programming in Java, and I'm a good PHP developer, so I find Hello World and generic programs-to-read-from-STDIN aren't really very informative. I imagine that a better...
Best way to get started with programming other things than your computer?
What is the best way to get started with programming things outside of your computer? I don't mean mainstream things like cell phones with APIs. Please assume working knowledge of C/C++ ...
Programming on a Nintendo DS
I was reading this answer previously and it got me interested in purchasing a Nintendo DS Lite for learning to program embedded devices. Before I go out and splurge on a DS I had a few questions: Are there any restrictions on what you can program? The post I indicated earlier seemed to say there weren't, but clarification would be nic...
End of FILE* pointer is not equal to size of written data.
Very simply put, I have the following code snippet: FILE* test = fopen("C:\\core.u", "w"); printf("Filepointer at: %d\n", ftell(test)); fwrite(data, size, 1, test); printf("Written: %d bytes.\n", size); fseek(test, 0, SEEK_END); printf("Filepointer is now at %d.\n", ftell(test)); fclose(test); and it outputs: Filepointer at: 0 Writte...
Is it true that there is no need to learn C because C++ contains everything?
I am taking a class in C++ programming and the professor told us that there is no need to learn C because C++ contains everything in C plus object-oriented features. However, some others have told me that this is not necessarily true. Can anyone shed some light on this? ...
Calling C/C++ from python?
What would be the quickest way to construct a python binding to a C or C++ library? (using windows if this matters) ...
Wide exec for C/C++
Is there a wchar_t version of exec[lv][pe]* (i.e. an exec that uses wchar_t as path and wchar_t as arguments)? In Windows, I can just do CreateProcessW(process, cmdline), but in *nix, I'm stuck (i.e. no pure POSIX equivalent). I'm trying to add UTF-16 support to my program (an autorun). ...
How to find out which numbers occur the most in a given group of numbers?
Suppose we have a vector/array in C++ and we wish to count which of these N elements has maximum repetitive occurrences and output the highest count. Which algorithm is best suited for this job. example: int a = { 2, 456, 34, 3456, 2, 435, 2, 456, 2} the output is 4 because 2 occurs 4 times. That is the maximum number of times 2 occu...
Is Fortran faster than C?
From time to time I read that Fortran is or can be faster then C for heavy calculations. Is that really true? I must admit that I hardly know Fortran, but the Fortran code I have seen so far did not show that the language has features that C doesn't have. If it is true, please tell me why. Please don't tell me what languages or libs are...
Manpage scandir() prototype weirdness
I have a problem with scandir(): The manpage contains this as prototype: int scandir(const char *dir, struct dirent ***namelist, int (*filter)(const struct dirent *), int (*compar)(const struct dirent **, const struct dirent **)); Therefore I have this: static inline int RubyCompare(const struct dirent **a, const struct dirent ...
C header file loops
I have a couple of header files, which boil down to: tree.h: #include "element.h" typedef struct tree_ { struct *tree_ first_child; struct *tree_ next_sibling; int tag; element *obj; .... } tree; element.h: #include "tree.h" typedef struct element_ { tree *tree_parent; char *name; ... } element; The ...
The exec family
I have a project the requires the use of the exec family. My project consist of making an interactive shell. The shell will implement a few basic commands like cd, ls, echo, etc. I have been researching the use of exec, but have not found a useful site. Any suggested links would help. int ret; ret = execl ("/bin/ls", "ls", "-1", (char *...
C++ versus D
Is the D language a credible alternative to Java and C++? What will it take to become a credible alternative? Should I bother learning it? Does it deserve evangelizing? The main reason I ask is that with the new c++ standard (c++0x) almost here, its clear to me that the language has gone well past the point of no return with respect to ...
How can i tell if a given path is a directory or a file? (C/C++)
I'm using C and sometimes i have to handle paths like C:\Whatever, C:\Whatever\ or C:\Whatever\Somefile Is there a way to check if a given path is a directory or a given path is a file? :O ...
What #defines are setup by xCode when compiling for iPhone
I'm writing some semi-portable code and want to be able to detect when I'm compiling for iPhone. So I want something like #ifdef IPHONE_SDK.... Presumably xCode defines something, but I can't see anything under project properties, and google isn't much help. ...
Easy way to use variables of enum types as string in C?
Here's what I am trying to do: typedef enum { ONE, TWO, THREE } Numbers; I am trying to write a function that would do a switch case similar to the following: char num_str[10]; int process_numbers_str(Numbers num) { switch(num) { case ONE: case TWO: case THREE: { strcpy(num_str, num); //some way to get the ...
Multithreaded Memory Allocators for C/C++
Hi I currently have heavily multithreaded server application, and I'm shopping around for a good multithreaded memory allocator. So far I'm torn between: -Sun's umem -Google's tcmalloc -Intel's threading building blocks allocator -Emery Berger's hoard From what I've found hoard might be the fastest, but I hadn't heard of it before ...