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.
405,463
questions
-2
votes
2
answers
40
views
uint8_t elements exceeding one byte?
I saw this code:
uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
I know uint8_t holds a byte, so how does this line of code work when a single
element, 0xFF, is in itself one whole ...
-4
votes
0
answers
26
views
How do i interact with an image in C [closed]
Ok so i wanted to write a program that could take an image check each individual pixel's color in a frame and assign it a greyscale number just by dividing the RGB value by 3. the problem is that i ...
- 11
1
vote
2
answers
47
views
Any one know how return 0 works or maybe any problem with devc++
im new at coding.
so right now im learning C and im using devc++.
but i don't know my program instantly close after i compile
#include <stdio.h>
int main() {
printf("hello");
...
2
votes
0
answers
22
views
How to take screenshot in gtk4?
I am trying to take a screenshot of the root window in gtk4. This is how I do it in gtk3--
GdkWindow *root_win = gdk_get_default_root_window();
gint width = gdk_window_get_width(root_win);
gint ...
- 135
1
vote
1
answer
43
views
Linking header file still leads to undefined reference
I have three files:
vector2d.h referencing my functions.
vector2d.c defining my functions.
test_vectors.c as the main file.
test_vectors.c doesn't build because it returns an undefined reference error ...
- 21
0
votes
0
answers
43
views
Dev C++ strcmp in C returns -1 instead of 1 [closed]
The code:
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int main(){
int result;
char can[15];"a";
char canan[15];"A";
...
- 9
0
votes
0
answers
29
views
Use C socketpair [closed]
I try to write test for a function which reads from socket, preferably using one process. To simulate a sender, I plan to use socketpair, but the following code does not work.
#include <stdio.h>
...
- 5,972
2
votes
3
answers
95
views
Converting to char*** from char* [2][2]
I have the following variable
char* a[2][2] = {{"123", "456"}, {"234", "567"}};
I wanted to refer it using another variable. While the cast works, accessing ...
- 37
-2
votes
0
answers
55
views
Shift Scheduling using Hungarian Algorithm
Question:
A retail store needs to schedule shifts for its employees over a week. Each employee has different skills and preferences, and each shift requires specific skills. The goal is to minimize ...
- 11
0
votes
1
answer
100
views
Why does defining the elements of the array b is required to get the desired output
I recently learnt about typecasting pointers. So I played around, and made this bad code:
#include <stdio.h>
int main()
{
int* a;
char b[]= "Hye";
a = (int*)&b;
*a='...
- 13
0
votes
0
answers
72
views
C grammar BNF format? [closed]
I wanted to play around with the C grammar. I found somewhere this grammar below.
I seems it is not compatible with https://bnfplayground.pauliankline.com/ and I think the grammar provided is EBNF ...
- 28k
1
vote
1
answer
15
views
CSFML Background not loading
I'm trying to learn how to use CSFML. And i created this basic window:
my_window_t *init_window(void)
{
my_window_t *temp = malloc(sizeof(my_window_t));
sfTexture *texture = ...
- 13
2
votes
1
answer
91
views
Is comparing two pointers to different char objects undefined in C?
This is code of memmove from https://github.com/gcc-mirror/gcc/blob/master/libgcc/memmove.c
void *
memmove (void *dest, const void *src, size_t len)
{
char *d = dest;
const char *s = src;
if (d &...
- 735
0
votes
1
answer
72
views
fflush(stdout) doesn't work on WSL Ubuntu
I'm writing simple Tetris game and this is function that prints out field with figures in one game tick. I call this proc in while-loop until the game ends and i want my program to "update" ...
1
vote
0
answers
20
views
Captures keep giving me the same value when enabling both channels of TIM4 in Input Capture Mode
Hardware:
Test bench that generates two PWM signals ( A and B )
Cable that connect the test bench to the other board
Other board that retrieves the PWM signals (Port D pin 12 and 13 ) and has to ...
- 31