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.
405,647
questions
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vote
0
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Broken pipe error with Ports between Elixir and C [closed]
I am attempting to write a program in Elixir that connects to a C program via Port and erl_interface. I got the C code up and running and managed to send data through the port as well as decode and ...
- 45
2
votes
3
answers
69
views
Read is blocked by getc
For the following code:
#include <unistd.h>
#include <stdio.h>
int main()
{
char buf[6];
printf("%c\n", (char)getc(stdin));
int ret = read(STDIN_FILENO, buf, 5);
...
- 66.3k
661
votes
10
answers
93k
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Undefined, unspecified and implementation-defined behavior
What is undefined behavior (UB) in C and C++? What about unspecified behavior and implementation-defined behavior? What is the difference between them?
- 19.9k
0
votes
1
answer
102
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Reduce an Image in C
Hello fellow programmers. I'm new to the forum so please bear with me.
What I am trying to achieve is taking a loaded image from file(e.g. background wallpaper image 4000x2250) and scale it down to ...
- 11
0
votes
0
answers
13
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K&R recommends the use of int when reading character using getchar()? [duplicate]
The problem is distinguishing the end of the input from valid data. The
solution is that getchar returns a distinctive value when there is no more input,
a value that cannot be confused with any real ...
- 92.1k
0
votes
0
answers
64
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How do I properly call OpenGL 3.3 functions in Fortran?
For some reason, I am trying to run OpenGL 3.3 in Fortran. I'm having trouble calling glGenBuffers().
When trying to compile a program with the glGenBuffers function, the lnk2019 error occurs. The ...
-1
votes
1
answer
21
views
Populating two arrays from a CSV file with each row containing two words separated by a semicolon
How could I fix my code that populates two separate arrays from a CSV file that contains words separated by semicolons in C?
My CSV file looks something like this:
to meet/encounter;begegnen
to care ...
- 43.5k
2
votes
1
answer
11k
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File transfer using RPC(any type of file)
I want to construct a RPC Program to transfer any type of files. But I am getting segmentation fault after running the client:such as
./file_client localhost
>get /home/ab/1.txt
>put /home/1....
CommunityBot
- 1
1
vote
1
answer
79
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C serial communication, Why does read() lose some data bytes at high baud rates (e.g., B921600)?
Question:
I am implementing a C program to communicate between two serial ports on the same machine. The setup involves two serial ports connected via a Null Modem adapter, and I am experiencing an ...
- 16.7k
0
votes
1
answer
58
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Weird timings when measuring the perfomance of binary search [closed]
Okay, so what is happening here puzzled me for 2 days. Basically, as an activity I was measuring how much time some algorthim takes to execute in its worse, average, and best cases. Until now, I got ...
- 1
0
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0
answers
22
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Problem With Adding SFML 2.6.1 To Dev C++ (Linker Error)
I'm trying to add SFML 2.6.1 to Dev C++ (I use Windows 7). I added lib and include to Libraries and C++ Includes in Compiler Options; and added "-lsfml-graphics -lsfml-window -lsfml-system" ...
- 13
18
votes
6
answers
26k
views
How can I prevent scanf() to wait forever for an input character?
I want to fulfill the following things in a console application:
If user inputs a character, the application will do the
corresponding task. For example, if user inputs 1, the program
will do task 1, ...
- 23.8k
0
votes
1
answer
272
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Trouble building git-credential-libsecret: unknown type name ‘SecretService’
I'm trying to compile the git-credential-libsecret.c in /usr/share/doc/git/contrib/credential/libsecret by running sudo make on the Makefile there.
However, this fails with the following output:
gcc ...
- 21
0
votes
1
answer
27
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problem with cs50 p-set3 runoff (print winner funtion)
so this is a problem from CS50 Week 3 runoff, when I am running this code I am getting the following error, I cant understand why?
I don't find any problem with the code, so need help from more ...
- 7,437
2
votes
1
answer
31
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LNK2019 unresolved external symbol in function defined in static library
I am trying to compile a driver through the use of cl.exe on Windows 10. It is written in pure C. I am using the Enterprise Windows Driver Kit to provide source files and compiling for X86. I ...
- 23