Questions tagged [c]
C is a general-purpose programming language used for system programming (OS and embedded), libraries, games, and cross-platform. This tag should be used with general questions concerning the C language, as defined in the ISO 9899 standard (the latest version, 9899:2018, unless otherwise specified — also tag version-specific requests with c89, c99, c11, etc.). C is distinct from C++, and it should not be combined with the C++ tag without a specific reason.
405,629
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Small differences between scipy.fft (Python) results and FFTW (C) results [closed]
I am trying to recreate a result using FFTW in C from some known working code in scipy.fft in Python. I am finding small inaccuracies in my results.
My input data is real 3d with dimensions = (294, ...
- 273
1
vote
2
answers
109
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Why doesn't `char` lose data when an `int` is being assigned to it?
I'm a novice C programmer. I defined two variables int x = 0xffffffff and char y = x, thereafter I printed that using the printf("%x\n", y) function; I was expecting something like ff on the ...
- 33
0
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0
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27
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Tobii Eye Tracker 5 C API Callbacks
I have a Tobii Eye Tracker 5 and I'm using the C API. The concept validation tool works without troubles, I can print my devices serial id, gaze output frequency, and so on. The notification callback ...
2
votes
2
answers
57
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Using printf from c in Nasm causes the string to add random end line statment
this morning i tried to make a simple output library for my asm projects, i realized using the sys call each time is a waste of time and so i decided to automatize the program using printf function ...
- 35
-1
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0
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24
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How to use libmnl to scan access points? [closed]
My question is similar to this one: Using nl80211.h to scan access points. But the difference is that I would like to use libmnl and not libnl. Would someone write an example of using libmnl and ...
- 155
1
vote
0
answers
48
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How to make CLion recognize linux/init.h and other linux kernel headers?
I am trying to do some Linux Kernel programming with CLion. I observe that some headers, like <linux/kernel.h> and <linux/module.h> are correctly recognized, but some others, like <...
- 63
2
votes
1
answer
114
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array of pointers to pointers to integers VS pointer to pointer to array of integers
I have 3 integers A, B & C from which I make pointers that I group in an array arrayABC of pointers to pointers:
int A = 1;
int B = 2;
int C = 3;
int *ptA = &A;
int *ptB = &B;
int *ptC = &...
- 128
3
votes
2
answers
117
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Widespread use of non-portable `void **` casts
I believe the following code is well-defined according to the C standard:
void f(void **);
void *p;
f((void **)&p);
But what if p isn't a pointer to void, say:
void f(void **);
double *p;
f((void ...
- 43
0
votes
0
answers
40
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How to shift bits in unsigned long long [closed]
I have created a function in my C application intended to return values like "1.25GB", "4.60MB", "1.40KB" rather than the numeric values they represent (I hope I said ...
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0
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Can someone explain how this works properly ? I am really confused how output works in C [duplicate]
Code:
#include <stdio.h>
int main() {
int a = 2, b = 1, c = 0;
c = a++ + b;
printf("%d,%d,%d,%d,%d,%d", ++a, ++b, c++, ++c, b++, a++);
return 0;
}
Output: 5,3,4,...
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1
vote
1
answer
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Why address of the files stored on disk (of vbox vm) are different each time i look at them?
I am aware of ASLR which loads the program at different memory locations each time, however, I am not sure why this is happening in the case of files that I have stored on disk /dev/sda2 of my Linux ...
- 91
1
vote
0
answers
55
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No compile time errors or warnings are being shown on my terminal window in vs code
I am using c language and I am working on windows using gcc compiler..I have also installed extensions like code runner and c\c++ Microsoft one too.
For example,
If I put an assignment operator in the ...
- 11
1
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0
answers
27
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Python C++ extension DLL is not imported in python interpreter
I have written a Python extension in C/C++ to wrap my code for Python.
I followed CPython documentation in the parts of C/C++ functions each module should provide
For example, my module contains:
/* ...
- 11
0
votes
2
answers
46
views
YAML validation using JSON schema in C or Fortran program
I have a Fortran program that uses bind(c) and some wrappers written in C to use libyaml to read/parse a YAML file at runtime. This part of the program is a combination of Fortran and C code.
...
- 117
0
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0
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41
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Issue with Writing to Flash Memory on STM32WLE5 After Receiving LoRa Data
I’m working with an STM32WLE5 microcontroller, using code generated by STM CubeMX. My project incorporates LoRaWAN modules, follows the EndNode skeleton, and utilizes FreeRTOS (CMSIS V2.0). The common ...
