Category "c"

What does atof stand for?

In C atof=a-to-f(loat) converts a string into a double precision float. I am wondering what the a part of atof stand for.

Organise multiple fixed-length-string dictionaries for "sparse" string-lengths

I need to load some fixed-length-string dictionaries from disk: count of word-lengths ( 1 .. 18 ), word-lengths ( 3 .. 20 ), word-counts ( 1 .. N ) for each wor

Pass linked list to function with struct what I doing wrong?

I want to pass liked list to function and create new list. I need some help to understand what I'm doing wrong. I create new pointer and copy the pointer to "cu

Shared pthread_cond_broadcast stuck in futex_wait

I have one "server" process a and potentially multiple "client" processes b. The server creates a shared memory file (shm_open) containing a pthread_mutex_t and

Cython: Assign pointer values, not the pointer itself

C/C++ allows assigning values of a pointer to another pointer of the same type: #include <iostream> using namespace std; int main() { int* a = new i

Using qsort to sort a multidimensional array of variable-length strings in C

I have a piece of software that generates a rather large text file full of information about files in a directory. There are often several thousand files. Each

why the output is blank?

I have to write a program for matrix multiplication.there may be an easier algorithm,but i want to know what is the problem here and if there is anything wrong

What is a glibc free/malloc/realloc invalid next size/invalid pointer error and how to fix it?

You are most likely seeing this question because your question has been closed as a duplicate of this. For a moderately complete list of related questions, ple

Forward traffic via libnetfilter_queue

I have a need where i need to forward traffic with libnetfilter_queue to another server, after adding some informations in it. Problem is that i'm stuck on the

C language: main .obj file (and executable) is nearly 400MB in size

Dependencies: GLFW 3.3.7 GLAD 4.0 core CGLM 0.8.5 stb_image 2.2.7 Compiler: GCC 11.2.0 (MinGW-W64) CMake 3.23.1 GNU Make 4.3 Problem The .obj file for main.c (a

How to increment %eax register and output in a c callable function?

#include <stdio.h> extern int count(char *string, char c); int main(void) { char s[100]; char c; printf("Enter a string of characters:\n"); scanf

Can floats not suport negative or even 0?

It's follow-up question to: How to detect non IEEE-754 float, and how to use them? In theory, can we assume that c float always support negative numbers?

Intermittent SIGBUS on shared memory segment

I have a server process that allocates a big chunk of memory using the System V XSI shared memory calls (shmget/shmat), from address to 0x500000000 to 0x1d00000

Why not possible to fill any integer straight to a pointer variable?

#include <stdio.h> int main(void) { int* ptr = NULL; *ptr = 10; printf("%d", *ptr); return 0; } I am very new to C programming and sorry

Does i = x[i]++; lead to undefined behavior?

Can someone please explain whether i = x[i]++; lead to undefined behavior? Note: x[i] and i are not both volatile and x[i] does not overlap i. There is C11, 6.5

Is it possible to set bits of a void* value without type casting it to an int or char?

I am working on a project that requires me to allocate some space using the mmap function and I need to create a bitmap in the beginning of the allocated space.

What to use on Nodejs addons. Node.h or Napi.h

I have some pretty simple questions. What is the main difference between node.h and napi.h. What should I use for normal/personal use case. Why are there more "

How gcc decide to use dynamics library when creating executable?

I am creating an executable with this: gcc elliptical.o -Llibs -lhfcal -o elliptical In my libs sub folder there are: libhfcal.a libhfcal.so files. My purpos

simple code to read jpg files read retured 0 errno 0

I have simple code that reads a .jpg file But my read returns 0 and errno is 0. I just prefer of use read with read syscall. #include <stdio.h> #include &

reading Memory-Mapped IO registers How to (from datasheet) and using them in mmap

I have intel system with Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (Lewisville) (rev 04). I have downloaded the datasheet like d