Hello. I was writing a function which checks if every digit in a number is odd. I came accross this weird behaviour. Why does the second function return different (incorrect) results, eventhough its basically the same? (implemented in an opposite way) #include <stdio.h> int all_odd_1(int n) { if (n == 0) return 0; if (n < 0) n = -n; ...
Ive got a task in C to sort a struct by using qsort struct user { enum SEX{m, f} sex; char name[32]; char phonenr[32]; }; typedef struct user User; the users will be stored in a array of 25 elements but how do i sort them on something like name ? ...
I'v created a window after creating my main one but calling DestroyWindow on its handle closes the entire application, how can I simply get rid of it? it looks like this: BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { HWND hWnd; HWND fakehandle; hInst = hInstance; // Store instance handle in our global variable h...
I have a bunch of text files where I want to add a line ending after each period. I'm wondering if there is a way to do this by doing replacing all periods with a \n\n, assuming I have the right encoding (unix). Anyone know how I would do this? Replace .'s with .\n\n and then save as a different file? Thanks! ...
Possible Duplicate: Floating point inaccuracy examples double a = 0.3; std::cout.precision(20); std::cout << a << std::endl; result: 0.2999999999999999889 double a, b; a = 0.3; b = 0; for (char i = 1; i <= 50; i++) { b = b + a; }; std::cout.precision(20); std::cout << b << std::endl; result: 15.000000000000014211 So.. ...
I'm not quite sure why I can't do double a = (double) my_Function(45) / 2048 / 2340 / 90; printf("%.4f",a); // prints out 0.00 But instead I have to use one more variable as: double a = (double) my_Function(45); double b = a / 2048 / 2340 / 90; printf("%.4f",b); // prints out the correct value ...
I want to create a Window like when a context menu pops up or clicking the menubar. I want a Window that will be like this and that I can take over its paint event. Sort of like what is created when you select a sub tool in Photoshop. EDIT:I want to know how to create controls like the one that comes when you select a sub tool in Photo...
First off, I've seen this question and understand why the following code doesn't work. That is not my question. I have a constant, which is declared like; //Constants.h extern NSString * const MyConstant; //Constants.m NSString * const MyConstant = @"MyConstant"; However, in certain contexts, it's more useful to have this constant ...
Ok I've been curious about this for a while. In the C language where did they come up with the name atoi for converting a string to an integer? The only thing I can think of is Array To Integer for an acronym but that doesn't really make sense. ...
I have a Ruby hash that reaches approximately 10 megabytes if written to a file using Marshal.dump. After gzip compression it is approximately 500 kilobytes. Iterating through and altering this hash is very fast in ruby (fractions of a millisecond). Even copying it is extremely fast. The problem is that I need to share the data in this...
I've been working with large sparse files on openSUSE 11.2 x86_64. When I try to mmap() a 1TB sparse file, it fails with ENOMEM. I would have thought that the 64 bit address space would be adequate to map in a terabyte, but it seems not. Experimenting further, a 1GB file works fine, but a 2GB file (and anything bigger) fails. I'm guessin...
What is the best way to access the low-order and high-order 4 bits of the char type and binding field in the elf symbol struct so that I may compare it to STT_FUNC, STT_OBJECT, STB_LOCAL, etc.? ...
can you guys tell me what is the wrong with this code? it is not working with 1 2 1 3 1 4 2 5 2 6 2 7 2 8 3 8 3 9 4 10 1 -> 4 -> 10 and stop DFS function void Is_Connected(graphType* g, int v){ //function to define the graph is connected or not int i=0; g_node* w; top = NULL; g -> visited[v] = TRUE; push(v); print...
I have inherited a very long set of macros from some C algorithm code.They basically call free on a number of structures as the function exits either abnormally or normally. I would like to replace these with something more debuggable and readable. A snippet is shown below #define FREE_ALL_VECS {FREE_VEC_COND(kernel);FREE_VEC_COND(cirra...
what is the difference between deleting a pointer, setting it to null, and freeing it. delete ptr; vs. ptr=NULL; vs. free(ptr); ...
if i have defined a global variable(with initialization) in header file, and included this file in two file and try to compile and link, compiler gives linking error headers.h: #ifndef __HEADERS #define __HEADERS int x = 10; #endif 1.c: #include "headers.h" main () { } 2.c: #include "headers.h" fun () {} ...
how to use a variable defined in a header, and using them in multiple source files using extern. I am getting multiple definition error. ...
Hi, I am creating a shared library in C but don't know what is the correct implementation of the source codes. I want to create an API like for example, printHello, int printHello( char * text ); This printHello function will call another function: In source file, libprinthello.c, void printHello( char * text ) { printHi(); ...
Hello, gcc 4.4.4 c89 just wondering what is the standard way to null terminate a string. i.e. However, when I use the NULL I get the warning message. *dest++ = 0; *dest++ = '\0'; *dest++ = NULL; /* Warning: Assignment takes integer from pointer without a cast */ source code I am using: size_t s_strscpy(char *dest, const char *sr...
Hi all, I'm trying to make a little client-server script like many others that I've done in the past. But in this one I have a problem. It is better if I post the code and the output it give me. Code: #include <mysql.h> //not important now #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #includ...