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.
405,584
questions
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Why lines variable is 0?
I've created wc like program and when i tried to do line counting, it shows as 0. The code:
#include <stdio.h>
#include <stdlib.h>
FILE* file;
int main(int argc, char* argv[]) {
//...
1
vote
1
answer
46
views
Redirect stdout in unit testing with ctest
Writing unit test with ctest. The function to test is doing printout to stdout/stderr.
So, right now, I am having:
typedef struct {
char *stdout_file;
char *stderr_file;
} test_config;
static int ...
- 357
0
votes
0
answers
14
views
Issue with Cache Way Partioning on Raspberry Pi5 - A76/DSU
I am attempting to get Cache Way partitioning to work on the Raspberry Pi-5 using the process defined here https://developer.arm.com/documentation/100453/0401/L3-cache/L3-cache-partitioning?lang=en. I ...
0
votes
1
answer
73
views
First Hello World in C using MacOS and the terminal prompt
I´m doing my first program in C and I don´t now how to compile it to show the message in the terminal.
#include <stdio.h>
#include <stdlib.h>
int main()
{
printf("Hello World!\n&...
- 11
0
votes
1
answer
70
views
Should Portable Types Be Used in the Declaration of a Main Function? (C11)
This question came to me last night, and I couldn't find a definitive answer in my brief surf of Google. Should (or could) I use portable types (i.e int32_t) in the declaration of my program's main ...
- 108
0
votes
3
answers
83
views
Trying to read txt file line by line in C Language
Basically my input file is in the format:
I 15 3 15 10 10 20
S -5 3 15 82
I -20 80 -4 10
S 4 -20 8
The number of ints in a row can vary, but there is always one char at the beginning of each ...
0
votes
0
answers
27
views
pwntools p32(arg1) got issue when arg1=10, maybe because 0xa
I was tring to learn stackoverflow so I wrote me a program, here's the source code:
# include <stdio.h>
void pwn(int a, int b) {
printf("Pwned! arg1 = %d, arg2 = %d\n", a, b);
}
...
- 1
2
votes
0
answers
41
views
ESP32 FreeRTOS crashes when calling callback between tasks
I'm trying to implement the observer pattern on ESP32H2 device (devkit) ESP-IDF v5.2.1. I have 2 FreeRTOS tasks (in 2 files), there is a register callback function in one file, which is used to pass a ...
- 70
1
vote
0
answers
15
views
How to auto move GtkWindow on current focused workspace?
I'm trying to automatically move the window to the focused workspace. That is, when I change the workspace, the Gtkwindow will automatically move to that workspace. I tried the script below but it is ...
- 165
1
vote
2
answers
52
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Analog data operations do not work in PIC12F675, there is not even a reaction on GPIO pins
This Analog data is read and the number 1-5 is shown on the 7 segment common anode display with 7447, but I can't set this number for analog value because I can't show analog values or output I wrote ...
1
vote
0
answers
50
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Why are the __bss_start and __bss_end names NOT addresses?
I'm building for a Xilinx 7000 Zynq dual ARM processor. I thought the linker was gnu, but now I'm not sure whether it is or not.
I can create a memory section in the linker script, with something like ...
- 193
0
votes
1
answer
39
views
function to return number of characters in n line of a file return always those of line 2 in c
the function is supposed to return the length of a line specified by the 2nd argument
but the result is either 0 or the one in the 2nd line whatever n may be:
int line_length(const char *filename, int ...
2
votes
1
answer
87
views
Return an array of objects from a C function? [duplicate]
I'd like to know how to return an array of objects from a C function.
Here's an example:
SDL_Vertex initTriangle (struct Point2D point1, struct Point2D point2, struct Point2D point3) {
SDL_Vertex ...
- 23
1
vote
0
answers
41
views
AVX512 duplicate low 256 bits into high 256 bits inside a zmm register
Is there a faster way to duplicate (copy) the low 256 bits of an AVX-512 register into the higher 256 bits than using the _mm512_insertf64x4 instruction?
My current solution is:
__m512d zmm1 = ...
- 71
1
vote
0
answers
36
views
Correct Method to Place Multiple Arrays in a Custom Flash Section in C using GCC
I need to store a constant array in flash memory at a specific location using GCC in my embedded C project. For a uint32_t value, I managed to do it like this, and it works:
const uint32_t ...
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