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C QUESTIONS

How to implement B+ Tree for file systems?
How to implement B+ Tree for file systems?
I hope this helps you . Use a database. The key points in implementing a tree in a file are to have fixed record lengths and to use file offsets instead of pointers.
TAG : c
Date : November 26 2020, 07:01 PM , By : 853294317
Stack storage at function call
Stack storage at function call
this will help It is entirely implementation-dependent how arguments are passed to a function. Function arguments might not even be passed on the stack; they could be passed in registers, for example.
TAG : c
Date : November 26 2020, 07:01 PM , By : Dhaval Patel
Manipulate the Clipboard in C on Mac OS X
Manipulate the Clipboard in C on Mac OS X
I hope this helps . How do you copy text to the clipboard in C or with a Command-Line command? , pbcopy and pbpaste are your friends on the command line:
TAG : c
Date : November 26 2020, 07:01 PM , By : user3863417
Problem with writing a hexadecimal string
Problem with writing a hexadecimal string
should help you out When it processes "f", it converted it to the character f, which is ascii 102, which is hex 66. That's why you got the "s66" part of your answer.%x prints out an integer in its hexadecimal representation.
TAG : c
Date : November 26 2020, 07:01 PM , By : sharemail sp
Why does this code read all ' ' for the anything after the 4th character?
Why does this code read all ' ' for the anything after the 4th character?
hop of those help? This is because the %s is trying to print out a string. It detects the end of the string by finding the null character (byte value of 0). So, it's probably not printing out a space at all, but rather printing out nothing, or an emp
TAG : c
Date : November 26 2020, 07:01 PM , By : mpud
GUI for linux c
GUI for linux c
wish helps you If you want to develop GUI applications for Linux with pure C you can use GTK+. IF C++ is an option you also have Qt.
TAG : c
Date : November 26 2020, 07:01 PM , By : Julesw01
Where do I put all these function-like #defines, in C?
Where do I put all these function-like #defines, in C?
this will help I'm working with an embedded system, and I'm ending up with a ton of HW-interfacing define macros. I want to put all of these into a separate file (for OOP-ness), but I don't know the best way to include that. Do I just put them all in
TAG : c
Date : November 26 2020, 07:01 PM , By : DrP6464
Padding in 24-bits rgb bitmap
Padding in 24-bits rgb bitmap
I hope this helps . Because 24 bits is an odd number of bytes (3) and for a variety of reasons all the image rows are required to start at an address which is a multiple of 4 bytes.
TAG : c
Date : November 25 2020, 07:01 PM , By : user3863256
how to acess and change variable of kernel space from user space
how to acess and change variable of kernel space from user space
I wish did fix the issue. From the perspective of a user land program, you should think of the driver as a "black box" with well defined interfaces instead of code with variables you want to change. Using this mental model, there are four ways (i.e.
TAG : c
Date : November 25 2020, 07:01 PM , By : user511
Can a conforming C implementation #define NULL to be something wacky
Can a conforming C implementation #define NULL to be something wacky
I think the issue was by ths following , In the C99 standard, §7.17.3 states that NULL “expands to an implementation defined null pointer constant”. Meanwhile §6.3.2.3.3 defines null pointer constant as “an integer constant expression with the value
TAG : c
Date : November 25 2020, 07:01 PM , By : Shanksr Kharol
send() always interrupted by EPIPE
send() always interrupted by EPIPE
this will help As suggested already by EJP, EPIPE comes if the other side has closed the socket. Also, I don't think your logic of adding to "total_bytes_sent" whatever send function returns is correct, because, send might return -1 in some cases whe
TAG : c
Date : November 25 2020, 07:01 PM , By : mosanark
Socket Select with empty fd set
Socket Select with empty fd set
I think the issue was by ths following , That's not right. You should be able to specify 0 as the number of file descriptors in the set. In fact, that's how I remember doing timeout code in the early days, using select with no descriptors and a timeo
TAG : c
Date : November 25 2020, 07:01 PM , By : Valarpirai
Coding self similar fractals in computer graphics using C
Coding self similar fractals in computer graphics using C
hope this fix your issue This should be enough to get you started. This plots a julia set in ascii. If you want to plot the mandelbrot set instead, iterate over c instead of z.
TAG : c
Date : November 25 2020, 07:01 PM , By : devansh
Forking with Pipes
Forking with Pipes
this will help The problem is that pipefd is not an int**, it's an int[3][2], so when you pass it to cmd, you get garbage. Your compiler should be giving you a warning on each call to cmd(), such as something like this:
TAG : c
Date : November 25 2020, 07:01 PM , By : Suranga Perera
sscanf + c99 not working on some platforms?
sscanf + c99 not working on some platforms?
this will help Probably the CentOS box is using an old version of glibc. Since the nonstandard GNU extensions to their scanf implementation ended up making glibc conflict with c99, they added a nasty hack of redirecting *scanf to __isoc99_*scanf when
TAG : c
Date : November 25 2020, 07:01 PM , By : 鲁尚东
Problem with C function of type char pointer, can someone explain?
Problem with C function of type char pointer, can someone explain?
To fix the issue you can do Can someone help me find the errors in this C function?
TAG : c
Date : November 24 2020, 07:00 PM , By : Loveless
Macros in C.... please give the solution
Macros in C.... please give the solution
this one helps. Suppose I declared a macro name anything, xyz(). , No, the first macro wiil only be defined once. When you write
TAG : c
Date : November 24 2020, 07:00 PM , By : May Magbanua
Unix Piping using Fork and Dup
Unix Piping using Fork and Dup
hop of those help? Your example code was syntactically and semantically broken (e.g. pipefd2 not decared, confusion between pipefd and pipefd2, etc.) Since this smells like homework, please make sure you understand my annotations below and ask more i
TAG : c
Date : November 24 2020, 07:00 PM , By : M_Jli
Any difference between these two while loops?
Any difference between these two while loops?
I wish this helpful for you The semicolon after the first loop is not a part of that loop at all. It is interpreted as a completely independent empty statement that sits between the loops. I.e. your actual loops are seen as absolutely identical by C
TAG : c
Date : November 24 2020, 07:00 PM , By : n.r
Hashtable implementation for C
Hashtable implementation for C
hope this fix your issue The one in glib is very nice. Not sure if it's too large and/or possible to isolate from the rest of glib, though.Failing that, Pearson hashing seems to be a good starting point for implementing your own (it's a hash function
TAG : c
Date : November 24 2020, 07:00 PM , By : Ini-Oluwa Adeyemo
Problems with Linked List in C
Problems with Linked List in C
To fix the issue you can do It looks like you took some code on the internet and tried to use it.The code works just fine, you just don't know what a pointer is.
TAG : c
Date : November 24 2020, 07:00 PM , By : britmo
Stack Allocation in C
Stack Allocation in C
Does that help It is bad style to use heap allocation if you don't really need it. Especially in simple programs.
TAG : c
Date : November 24 2020, 07:00 PM , By : Į Đøņ't Cạrė TọỎz-Xƥ
Random function stuck on one number
Random function stuck on one number
hop of those help? You never seed the random number generator.If rand is called before calling srand, the random number generator is seeded with 1. So you get the same number every time.
TAG : c
Date : November 23 2020, 07:00 PM , By : Helen Rogers
printf following zeros to a certain degree
printf following zeros to a certain degree
it fixes the issue How would I make the actual calculation fill in zeros to the end of the string?
TAG : c
Date : November 23 2020, 07:00 PM , By : Andrii Iuraga
Measuring CPU clocks consumed by a process
Measuring CPU clocks consumed by a process
I wish this helpful for you The valgrind tool cachegrind (valgrind --tool=cachegrind) will give you a detailed output including the number of instructions executed, cache misses and branch prediction misses. These can be accounted down to individual
TAG : c
Date : November 23 2020, 07:00 PM , By : Krešimir Šako
How is a CRC32 checksum calculated?
How is a CRC32 checksum calculated?
around this issue Maybe I'm just not seeing it, but CRC32 seems either needlessly complicated, or insufficiently explained anywhere I could find on the web. , The polynomial for CRC32 is:
TAG : c
Date : November 23 2020, 07:00 PM , By : user3862574
Tips on redefining a register bitfield in C
Tips on redefining a register bitfield in C
should help you out Personally, I try to avoid using using bit fields for portability reasons. Instead, I tend to use bit masks so that I can explicitly control which bits are used.For example (assuming the bit order is correct) ...
TAG : c
Date : November 23 2020, 07:00 PM , By : Paul Tanton
Converting a program from c to bash script
Converting a program from c to bash script
Hope this helps I have created a small program in c languge.This program creates some child procceses in with the fork() function.The amount of the procceses that are created is given as the first argument of the console. I would like someone to help
TAG : c
Date : November 23 2020, 07:00 PM , By : Jonathan Doemel
Static library not included in resulting LLVM executable
Static library not included in resulting LLVM executable
should help you out As unwind said, -l is followed by the library name.For example, in linux library naming conventions, if a library is named libogg,
TAG : c
Date : November 23 2020, 07:00 PM , By : user3862383
What is the meaning of "wild pointer" in C?
What is the meaning of "wild pointer" in C?
I wish did fix the issue. The standard does not define or use the term "wild". I'd be careful "correcting" other people's opinions about what it means, and I'd especially avoid quoting random non-normative internet junk to support my position. To me,
TAG : c
Date : November 23 2020, 07:00 PM , By : chetz
Reading DWORD from binary file
Reading DWORD from binary file
this will help To read a multibyte quantity such as a DWORD (which is Win32-speak for a 32-bit number) you need to be aware of endianness. It's best to read the number one byte at a time, and convert from the byte ordering used in the file.
TAG : c
Date : November 23 2020, 07:00 PM , By : user3862354
Efficient way to find divisibility
Efficient way to find divisibility
To fix the issue you can do Let's say you need to find whether a positive integer K is divisible by a number between 100,000 and 150,000, and it is such a rare operation, that doing precalculations is just not worth the processor time or memory used.
TAG : c
Date : November 22 2020, 07:01 PM , By : Osbad44
Whats the fastest, portable way to hash pointers we know are pointer aligned to a fixed size int?
Whats the fastest, portable way to hash pointers we know are pointer aligned to a fixed size int?
wish help you to fix your issue When mod math is fast, a quick hash is to mod by a prime
TAG : c
Date : November 22 2020, 07:01 PM , By : Sri Ningsih
Why does my summation program behaves weird?
Why does my summation program behaves weird?
Hope this helps Yesterday, I had to do a math introduction test, where I had to calculate the cardinality of a summation. I was lazy to write it out and I thought I'd just write a small C program to solve it. I felt confident that'll work, since I di
TAG : c
Date : November 22 2020, 07:01 PM , By : Cindy LaTerra
How to determine values saved on the stack?
How to determine values saved on the stack?
like below fixes the issue No need for inline assembly. The saved state that entry_32.S pushes onto the stack for a syscall is laid out as a struct pt_regs, and you can get a pointer to it like this (you'll need to include and/or either directly or i
TAG : c
Date : November 22 2020, 07:01 PM , By : KCH
Thread scheduling C
Thread scheduling C
hop of those help? If I understand the question correctly you are trying to produce sort of a pipeline where the next thread picks up where the previous one stops. The cleanest solution in this case is to use binary semaphores.Say you have four threa
TAG : c
Date : November 22 2020, 07:01 PM , By : user3862318
C - converting to 2s complement
C - converting to 2s complement
may help you . You are talking about extended arithmetic. Most processors have carry-out and overflow results from every addition operation, but C does not provide access to them.Your problem is that numbers get longer as they get bigger. If you're a
TAG : c
Date : November 22 2020, 07:01 PM , By : master_of_puppets
wireless networks c program
wireless networks c program
fixed the issue. Will look into that further It is possible, but it is a very complex task and I don't think that programming language choice is the first thing to look into.As a start, you can read up on Wikipedia on Wireless ad-hoc networks.
TAG : c
Date : November 22 2020, 07:01 PM , By : user3862181
From where does the uboot get the information about flash, RTC, RAM in uboot/kernel development
From where does the uboot get the information about flash, RTC, RAM in uboot/kernel development
I hope this helps you . If you're looking for board specific things check.../include/configs/yourboard.h
TAG : c
Date : November 22 2020, 07:01 PM , By : Ignacio Lopez
printf behaviour in C
printf behaviour in C
To fix this issue I am trying to understand what is the difference between the following: , How using the 'f' changes/influences the output?
TAG : c
Date : November 21 2020, 07:01 PM , By : Shannon Simpson
Measure size and way-order of L1 and L2 caches
Measure size and way-order of L1 and L2 caches
wish of those help I think all you need to do is repeatedly access memory in ever-increasing chunks (to determine cache size), and I think you can vary the strides to determine associativity.So you would start out trying to access very short segments
TAG : c
Date : November 21 2020, 07:01 PM , By : user3862010
Efficient copy of entire directory
Efficient copy of entire directory
wish help you to fix your issue rsync is what you're looking for. Or tar if you feel like working with the shell on the other side.
TAG : c
Date : November 21 2020, 07:01 PM , By : user3862006
Efficient way to create/unpack large bitfields in C?
Efficient way to create/unpack large bitfields in C?
it should still fix some issue Use bit 0 and 31 to determine endianness and pack 3 10-bit values in the middle. One easy way to test matching endianness is to set bit 0 to 0 and bit 31 to 1. On the receiving end, if bit 0 is 1, assert that bit 31 is
TAG : c
Date : November 21 2020, 07:01 PM , By : Christopher Lee
getnameinfo prototype asks for sockaddr not sockaddr_in?
getnameinfo prototype asks for sockaddr not sockaddr_in?
around this issue struct sockaddr is a "super-class" of the concrete protocol address structures like struct sockaddr_in, struct sockaddr_in6, and struct sockaddr_un, etc. The getnameinfo(3) dispatches to a specific execution path based of the addres
TAG : c
Date : November 21 2020, 07:01 PM , By : user3861975
Linked List Sorting with Strings In C
Linked List Sorting with Strings In C
wish helps you When you enter AAA, BBB and then CCC namebox is always NULL when while loop finishes.And then you are doing:
TAG : c
Date : November 21 2020, 07:01 PM , By : SpiderXC
Typecasting a floating value or using the math.h floor* functions?
Typecasting a floating value or using the math.h floor* functions?
help you fix your problem I am coding up an implementation of Interpolation Search in C. , They are different when the value is < 0.
TAG : c
Date : November 21 2020, 07:01 PM , By : Xiaobo Zhou
Problem implementing sorting algorithm in C with an array of structs
Problem implementing sorting algorithm in C with an array of structs
will be helpful for those in need Apparently you're confusing an array of alumn structs with an array of pointers to alumm struct.The Bubble logic expexts the array of pointers, whereby the main function seems to call it with an array of structs.
TAG : c
Date : November 21 2020, 07:01 PM , By : user3861816
How to copy a ram_base file to disk efficiently
How to copy a ram_base file to disk efficiently
it should still fix some issue I want to copy a large a ram-based file (located at /dev/shm direcotry) to local disk, is there some way for an efficient copy instead of read char one by one or create another piece memory? I can use only C language he
TAG : c
Date : November 21 2020, 07:01 PM , By : user3861765
How to fix casting a pointer to an integer?
How to fix casting a pointer to an integer?
I wish this help you I'm writing a program that creates a doubly linked list out of an array. Here's the code so far: , How to fix casting a pointer to an integer?
TAG : c
Date : November 20 2020, 07:00 PM , By : Nirmal Tom
How to round floating point numbers to the nearest integer in C?
How to round floating point numbers to the nearest integer in C?
help you fix your problem 4.9 + 0.5 is 5.4, which cannot possibly round to 4 unless your compiler is seriously broken.I just confirmed that the Googled code gives the correct answer for 4.9.
TAG : c
Date : November 20 2020, 07:00 PM , By : user3861695
PIC C - Sending 200 values over USB, but it only sends 25 or so of them
PIC C - Sending 200 values over USB, but it only sends 25 or so of them
To fix this issue You might be over-filling the buffer (FIFO in hardware) if it's too short. This is why the delay has solved the problem - because you gave the hardware time to actually send out some bytes before you filled in new ones into the FIFO
TAG : c
Date : November 20 2020, 07:00 PM , By : user3861628
How do you return a string from a function correctly in Dynamic C?
How do you return a string from a function correctly in Dynamic C?
wish helps you Here are the problems I can see: Function char_to_bits returns the char array bits which is local. So its memory will be lost once the function returns. To solve this allocate memory for bits dynamically using malloc and later free it
TAG : c
Date : November 20 2020, 07:00 PM , By : Ira
Monotonic clock on IRIX
Monotonic clock on IRIX
will be helpful for those in need _rtc is the fastest clock in the system that doesn't wrap. It's a compiler extension, so I think you'll have to use the SGI compilers. If "fairly high-res" is good enough, it will probably be fine; if you need even b
TAG : c
Date : November 20 2020, 07:00 PM , By : constantine
setsockopt (sys/socket.h)
setsockopt (sys/socket.h)
around this issue The SO_RCVBUF option is defined as having a parameter type of int, so (c) and (d) are not correct.
TAG : c
Date : November 20 2020, 07:00 PM , By : user3861480
How to make C program wait (on Linux)?
How to make C program wait (on Linux)?
should help you out If you want to wait for a MPI request use MPI_Wait: http://www.manpagez.com/man/3/MPI_Wait/If you want to wait a certain amount of time use sleep: http://www.manpagez.com/man/3/Sleep/
TAG : c
Date : November 20 2020, 07:00 PM , By : user3861419
i find a problem using atoi() method in ansi c?
i find a problem using atoi() method in ansi c?
wish of those help No matter what your problem with getting atoi to work is, you should rather use strtol. From the libc info manual:
TAG : c
Date : November 20 2020, 07:00 PM , By : user3861377
Why is this array being initialized in an odd way?
Why is this array being initialized in an odd way?
should help you out The ith element of the array wl[] is the number of words of length i that have been found in an input file. The wl[] array needs to be zero-initialized first so that ++wl[nc]; does not cause undefined behavior by attempting to use
TAG : c
Date : November 19 2020, 07:01 PM , By : Sukhveer Kaur
How to execute commands in chroot?
How to execute commands in chroot?
will help you If you use chroot(), you have to consider the consequences of what you do. One of the major consequences is that many (most, all) of the commands normally available are not available unless you make them available in the chroot()'d envi
TAG : c
Date : November 19 2020, 07:01 PM , By : felix
Microsecond (or one ms) time resolution on an embedded device (Linux Kernel)
Microsecond (or one ms) time resolution on an embedded device (Linux Kernel)
it helps some times ms is not microsecond, it's millisecond. Without knowing more about your choice of device, no one can possibly answer such an implementation-dependent question as whether gettimeofday is based on the timer interrupt. If you have c
TAG : c
Date : November 19 2020, 07:01 PM , By : Jay Vee
Question about variable definitions in functions
Question about variable definitions in functions
I wish did fix the issue. The inner a is undefined, and as such, the compiler can use any value it likes. The value it likes is apparently the current value of the bytes "a" is occupying. The second time through the loop, you get a brand new inner-a,
TAG : c
Date : November 19 2020, 07:01 PM , By : Ruben_CL

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