I'm trying to traverse a binary tree in C. My tree contains an AST node (abstract syntax tree node for compiler). ASTnode reserves nodetype which specifies given node's type (i.e INT OP or CHAR and TYPE we don't need to concern other types), the other members are left and right pointers, and finally we store. Here is code for traversing...
Possible Duplicate: C programming : How does free know how much to free? When programming in C, I often usemalloc() to allocate memory and free() to release it: MyObject* objArr= (MyObject*) malloc(sizeof(MyObject)*numberOfObjects); /** Do stuff **/ free(objArr); How does free() know how much memory to deallocate? Does malloc...
I understand how malloc() works. My question is, I'll see things like this: #define A_MEGABYTE (1024 * 1024) char *some_memory; size_t size_to_allocate = A_MEGABYTE; some_memory = (char *)malloc(size_to_allocate); sprintf(some_memory, "Hello World"); printf("%s\n", some_memory); free(some_memory); I omitted error checking for the sak...
Greetings Is there any free software that can take C source files and generating documentation using them? Thanks ...
Say you #include and never use anything from stdio.h. What are the overhead costs associated with this? I noticed a lot of network code includes all networking related headers they can think of in case they end up using something from one of them, so I was wondering if this is some sort of ease of use vs efficiency trade off or if ther...
Dear developers? I could like to set a pixel in GIMP, but I can't figure out how to specify the pixel value. According to the GIMP plugin API it says: gboolean gimp_drawable_set_pixel (gint32 drawable_ID, gint x_coord, ...
Simply what the topic states, what's a memory efficient way to compute a sha256 hash of a file that's variable in size? I'm also willing to compromise using more memory for faster computation. ...
What requires the most CPU: int foo = 3; or typecasting it to an unsigned int? unsigned int foo = 3; ...
I am using free to free the memory allocated for a bunch of temporary arrays in a recursive function. I would post the code but it is pretty long. When I comment out these free() calls, the program runs in less than a second. However, when I am using them, the programs takes about 20 seconds to run. Why is this happening, and how can it ...
Hi I'm a little confused about how to specify my grammar member's type. I want to declare prog and decls as ASTNode. I'm gonna use these members for adding to a list or etc. But yacc can't recognize them as an ASTNode and I get type errors. Here my tIdent,tCharConst,tIntConstant have some types but, how to give ASTNode type to my membe...
It is obvious that in general the read(2) system call can return less bytes than what was asked to be read. However, quite a few programs assume that when working with a local files, read(2) never returns less than what was asked (unless the file is shorter, of course). So, my question is: on Linux, in which cases can read(2) return les...
I have a function get_trees() that operates on a complex tree structure T and returns two component tree structures A and B. The only way I have been able tot get this to work is to create a new structure C with pointers to A and B, which is then passed as a parameter to the function and is also a return value: typedef struct Composite ...
In MSVC++, there's a function strcmpi for case-insensitive C-string comparisons. When you try and use it, it goes, This POSIX function is deprecated beginning in Visual C++ 2005. Use the ISO C++ conformant _stricmp instead. What I don't see is why does ISO not want MSVC++ to use strcmpi, and why is _stricmp the preferred way, and w...
Hi, I am trying to do a simulate with Simcore Alpha/Functional Simulator and I need to create an image file but it is giving an error like "This is not Coff Executable" how can I create an Executable Coff file from a C source in linux? ...
Possible Duplicate: Why does simple C code receive segmentation fault? Hey Everyone, I'm sure this is a very basic question, but apparently I'm not quite understanding something here. I've been playing around with C a lot over winter break and just came across something that I thought would work but is giving me a segmentation ...
Does this seem correct? I'm trying to port this checksum method from C to Java but the values returned from my Java function are too high. I suspect the way I'm fudging the unsigned int is not correct? char *Generate( char * buffer, long length ) { static char tBuf[4]; long index; unsigned int checksum; for( index ...
I have a library I wrote with API based on opaque structures. Using opaque structures has a lot of benefits and I am very happy with it. Now that my API are stable in term of specifications, I'd like to write a complete battery of unit test to ensure a solid base before releasing it. My concern is simple, how do you unit test API based...
Has anyone seen any numbers / analysis on whether or not use of the C / C++ restrict keyword in gcc / g++ actual provides any significant performance boost in reality ( and not just in theory )? I've read various articles recommending / disparaging it's use, but I haven't ran across any real numbers practically demonstrating either side...
I have a little problem in my little project , I wish that someone here could help me! I am planning to use a bayesian network as a decision factor in my game AI and I want to improve the decision making every step of the way , anyone knows how to do that ? Any tutorials / existing implementations will be very good,I hope some of you co...
I have some .gz compressed files which is around 5-7gig uncompressed. These are flatfiles. I've written a program that takes a uncompressed file, and reads it line per line, which works perfectly. Now I want to be able to open the compressed files inmemory and run my little program. I've looked into zlib but I can't find a good soluti...