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.
405,487
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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='...
- 11
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0
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58
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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
13
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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
83
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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
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1
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47
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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" ...
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16
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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 ...
- 21
0
votes
2
answers
47
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Int32's from byte stream
I have a byte stream like
uint8_t buf[] = { 0xFF, 0x1B, … , 0x34 }; // approx. 800 Bytes
Now, I want to extract various ints from known positions and store them in their own variables, like "get ...
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answers
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Servo motors do not rotate constantly unlike the original Arduino code intended to
I want to move servo motors for loop without stopping! What is wrong?
#include <Adafruit_PWMServoDriver.h>
#include <Wire.h>
Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver();
int ...
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29
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CSAPP 3e (global): Possible erratum for "Practice Problem 8.3" (p. 781)?
Due to the relative lack of popularity of CSAPP's global edition, I have been unable to figure out whether exercise problem 8.3 (partial screenshots shown above) is entirely correct. I have only found ...
- 31
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2
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malloc(): corrupted top size on deleting an entry from binary file [closed]
I AM CREATING A SCHOOL MANAGEMENT SYSTEM . WHEN I TRY TO DELETE A STUDENT AFTER ADDING ONE I AM GETTING "malloc(): corrupted top size" ERROR .CANT FIND THE REASON.I AM A BEGINNER , HELP ...
- 1
1
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0
answers
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"No include path in which to find stdio.h" error
I get this error when I try to run a C program:
E:\c_stuff>gcc frist_c.c -o frist_c
frist_c.c:1: No include path in which to find stdio.h
But I already did reinstall MinGW and added the C:\minGW\...
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0
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55
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How can I have a better implementation of an unknown tree I wrote myself?
I am converting a X509 certificate management code from C++ to C, but C lacks many features that C++ has. So I wrote a data structure myself. Is there a similar data structure implemented in the ...
- 67
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1
answer
60
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'gcc' command does not give any output
I have been trying to run a c code from my terminal. The command:
gcc abc.c
is not giving any output and instead it gives me a new command line without any messages.
When I try
python3 abc.py
the ...
- 1
1
vote
2
answers
60
views
Does including a header obviate the need for extern declarations?
On page 33 of K&R (The C Programming Language, 2e), they remark that
If the program is in several source files, and a variable is defined in file1 and used in file2 and
file3, then extern ...
- 147
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1
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53
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Why is there random stuff in my string when printing its bytes?
I'm trying to see how format string bug works and tried to explore it by myself.
This is a simple program:
#include"stdio.h"
#include"string.h"
struct mystruct{
char buf[32];
...
- 11