Right now I'm trying this: #include <stdio.h> int main(int argc, char *argv[]){ if (argc != 3){ printf("Usage: %s %s sourcecode input", argv[0], argv[1]); } else { char source[] = "This is an example."; int i; for (i = 0; i < sizeof(source); i++){ printf("%c", source[i]); ...
Currently I have an objective-C program that detects when a Fujitsu scanner is added and removed from the computer. I'm trying to add the ability to ask the scanner information about itself. I know the command for this, however, something is going wrong. I'm doing a bit of cargo-cult programming, from two different cargo cults (How do yo...
Hello, I am writing an application that requires root user privileges to execute. If executed by a non root user, it exits and terminates with a perror message such as: pthread_getschedparam: Operation not permitted I would like to make the application more user friendly. As part of its early initialization I would like it to che...
How to traverse each node of a tree efficiently without recursion in C (no C++)? Suppose I have the following node structure of that tree: struct Node { struct Node* next; /* sibling node linked list */ struct Node* parent; /* parent of current node */ struct Node* child; /* first child node */ } It's not ho...
I have made a program which is a small library operated via software. When I add two books and then delete the first book the second book gets the same bookid as the first book because of count-- in the del() function. I cannot rely on printing the count as the bookid. Is there a better option? #include<stdio.h> #include<conio.h> #inclu...
This is a more theoretical question about macros (I think). I know macros take source code and produce object code without evaluating it, enabling programmers to create more versatile syntactic structures. If I had to classify these two macro systems, I'd say there was the "C style" macro and the "Lisp style" macro. It seems that debu...
Hi there, I read about freopen to redirect all printf to a file, but I would like the output to be printed on the screen as well. Is there an easy way to redirect the printfs to a file and get the cmd line output? Thanks! ...
I'm trying to format some printf statements to allow for arbitrary levels of indentation. Ideally I want the following output where "One", "Two", etc are placeholders for variable length log messages. One Two Three Two One I'm working on the variable length spacing required for the indentation, and I know I can do the following: ...
If there are non-number characters in a string and you call atoi [I'm assuming wtoi will do the same]. How will atoi treat the string? Lets say for an example I have the following strings: "20234543" "232B" "B" I'm sure that 1 will return the integer 20234543. What I'm curious is if 2 will return "232." [Thats what I need to solve ...
I'd like to define a function like MACRO . i.e. #define foo(x)\ #if x>32\ x\ #else\ (2*x)\ #endif that is, if x>32, then foo(x) present x else, foo(x) present (2*x) but my GCC complains about: int a = foo(31); I think C preprocessor should be handle this correctly. since at compile time, it knows x=33. it could replace foo(33...
So, I am looking at different hash functions to use for hashing a 4 tuple ip and port to identify flows. One I came across was ((size_t)(key.src.s_addr) * 59) ^ ((size_t)(key.dst.s_addr)) ^ ((size_t)(key.sport) << 16) ^ ((size_t)(key.dport)) ^ ((size_t)(key.proto)); Now for the world of me, I cannot expla...
First of all, this is not a floating point newbie question. I know results of floating point arithmetic (not to mention transcendental functions) usually cannot be represented exactly, and that most terminating decimals cannot be represented exactly as binary floating point numbers. That said, each possible floating point value correspo...
Soo, I'm having a few places in my program where I just fetch a single row (sometimes even a single column in a single row), for example SELECT id,title,posted FROM posts WHERE id=4; Since this will only return a single row (unless I suck at database stuff and somehow manage to have duplicated IDs) I feel it's overkill to go the whole...
How I can filter video stream from camera in MacOS X. I write quicktime sequence grabber channel component, but it`s work only if app used SG API. If app used QTKit Capture the component is not worked. Somebody know how I can implement it? ...
For a project that I intend to start on soon, I will need to play back compressed and uncompressed audio files. To do that, I intend to use the Core Audio framework. However, I have no prior experience in audio programming, and I'm really not sure where to start. Are there any beginner level resources or sample projects that can demonstr...
Hi, I have a utility that is opened from the context menu. You right-click an item in Windows Explorer and hit the "utility" button in the context menu to open the app. This brings up a little 'window' that's styled to be similar to a right click menu. Currently, it's really jarring to have that new menu open in a completely different p...
I wrote this code: #include <stdio.h> #include <stdlib.h> #include <time.h> #include <sys/types.h> #include <sys/shm.h> #define N 512 void chunk0(unsigned int *s, unsigned int *a, unsigned int *b, int MID,int it); void chunk1(unsigned int *s, unsigned int *a, unsigned int *b, int MID,int it); void chunk2(unsigned int *s, unsig...
i made the strrev function myself.while compling it says that the code in the func xstrrev() has no effect.i would also like to know that while making a copy of the built in funtion for assignments can we use builtinfunctions(other) in it?as i used strlen() in it. #include<stdio.h> #include<conio.h> #include<string.h> void xstrrev(char ...
i made a program which converts lower case to upper case a string.i know how to convert a char to upper case via preprocessor directives but i dont know how to do it for a string. #include<stdio.h> #include<conio.h> #include<ctype.h> #define UPPER([]) ([]-32) void fstring_convert(char string[]); void main(void) { char string[40]; print...
Possible Duplicate: static const vs #define in c I started to learn C in these days. And couldn't understand clearly differences between macros and constant variables. What changes when I write, #define A 8 and const int A = 8 ? ...