I am looking for a library for big integers but with fixed width (128 or 256 would be enough). The reason is I don't want any allocation on the heap. I tried to make them myself but implementing multiplication, division and modulo an efficient way seems to be quite a pain. Does this already exists somewhere ? Thanks ...
I have a double which is: double mydouble = 10; and I want 10^12, so 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10 * 10. I tried double newDouble = pow(10, 12); and it returns me in NSLog: pow=-1.991886 makes not much sense... I think pow isn't my friend right? ...
Is there a way to define and send custom message types in Win32, to be caught by your Main message handler? For example, my main message handler captures messages such as WM_PAINT, WM_RESIZE, WM_LBUTTONDOWN etc. Can I create my own WM_DOSOMETHING? If so, how would I send this message? Ah, I actually just discovered this was asked before...
Is there a historical reason or something ? I've seen quite a few times something like char foo[256]; or #define BUF_SIZE 1024. Even I do mostly only use 2^n sized buffers, mostly because I think it looks more elegant and that way I don't have to think of a specific number. But I'm not quite sure if that's the reason most people use them...
I am trying to move my code from Java to C, and I have encountered a problem while trying to find a function in C that can take an array of ints and create a bitmap from it for OpenGL. In Java, I used bitmap = Bitmap.createBitmap( {int array name} , w, h, Config.RGB_565); Is there a similar function that I can use in C, or a workar...
In C, I have a 32bit word representing an address (and I have it stored in a unsigned long, hope thats ok). Now from what I gather, part of an address contains the page number and the other part contains the offset. I was wondering how I could extract just the bits that give me the page number. I have already worked out the first 22 mos...
I am looking for an existing solution for transparent SQLite 3 zlib compression using a custom VFS implementation and a custom IO methods implementation. Is anyone aware of an existing project that already does that, or will I have to roll my own? I vaguely remember seeing something similar a year ago, but can't find it anymore. ...
The code below compiles, but immediately crashes for reasons obvious to others, but not to me. I can't seem to get it right, can anyone tell me how to fix this. *array_ref[2] = array[0]; *array_ref[3] = array[1]; It crashes on that part everytime. typedef struct test { char *name; char *last_name; } person; int setName(per...
I'm working with a library that redefines NULL. It causes some problems with other parts of my program. I'm not sure what I can do about it. Any idea? My program's in C++, the library's in C. #ifdef NULL #undef NULL #endif /** * NULL define. */ #define NULL ((void *) 0) Oh, and it produces these errors: Generic.h:67: error: def...
Here's a simplified version of my code: - (IBAction)convert:(id)sender { /* these two lines are ignored */ [textbox setStringValue:@"converting"]; [convertButton setEnabled:NO]; pid_t pid; if((pid=fork())==-1) { [log setStringValue:@"couldn't fork a new process."]; converting = 0; [convertBut...
I'm looking for an API (or some information as to where to look/start) that will ultimately allow me to monitor sound being played by the computer. My end goal (well, certain to eventually be a stepping-stone) is an oscilloscope. Where should I begin to look (aside from Google, which has yielded unsatisfactory results) to learn more a...
Lets say i have two inline functions in my header file: inline int foo() { return bar()+2; } inline int bar() { return 3; } can i assume that a C99 compiler will inline "foo" even if 'bar' is declared later? Assuming that no other internal rule like function body to large is triggered. Are implementations of c compilers doing this (p...
A friend of mine showed me a situation where reading characters produced unexpected behaviour. Reading the character '¤' caused his program to crash. I was able to conclude that '¤' is 164 decimal so it's over the ASCII range. We noticed the behaviour on '¤' but any character >127 seems to show the problem. The question is how would we ...
Hey there, How do I go about copying text inside a text file into a multidimensional character array? supposing the text file( text_file.txt) contained this is the first line this is the second line this is the third line #include <stdio.h> int main(void){ FILE *f; f=fopen("text_file.txt","r"); if (f==NULL){ printf(...
(I don't have a serious need for this answer, I am just inquisitive.) Can every if-else construct be replaced by an equivalent conditional expression using the conditional operator ?:? ...
Does anyone have experience with Sparse? I seem unable to find any documentation, so the warnings and errors it produces are unclear to me. I tried checking the mailing list and man page but there really isn't much in either. For instance, I use INT_MAX in one of my files. This generates an error (undefined identifier) even though I #in...
The win32 API has for example two methods StrFormatByteSize and StrFormatByteSizeEx. Even though both the methods symantically do the same thing and the Ex counter part only offers a new parameter to slightly change the behavior then couldn't they have two overloads of the same function? Is it a limitation of c/c++ or what is the possib...
What is the type of &a in the following code? char a[100]; myfunc(&a) Is this even valid code? gcc -Wall complains about missing prototype but will otherwise generate code as if myfunc(a) was written. ...
Can unsigned long int hold a ten digits number (1,000,000,000 - 9,999,999,999) on a 32-bit computer. What is the what is the range of unsigned long int , long int, unsigned int, short int, short unsigned int and int? ...
How do I do to handles some big positive integers (like 9,999,999,999) on Visual C++ 2008 on a 32-bit PC. Please give an example on declaring, printf, scanf of these big positive integers. Please consider using 9,999,999,999 in your example. ...