C-Programs | Basic programs written in C using ANSI for GNU-GCC | 3D Printing library
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Basic programs written in C using ANSI for GNU-GCC
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QUESTION
I don't have much experience with C and am starting to use makefiles for my C programs. I'm trying to write a multi-target makefile in the simplest possible format, but I keep getting an error. I followed the template I found on a few pages, including this question, which work when I have only one .c and .h, but when I make a utils.h and utils.c file and try to run my program.c file with those dependencies, I keep getting an error:
...ANSWER
Answered 2021-Apr-24 at 01:28- You have to link both object files compiled from
program.c
andutils.c
. - It is bad to give the same name for both of compilation result of
program.c
andutils.c
.
Try this:
QUESTION
I recently learned something from this question about cin
in C++ and its speed was compared with the speed of scanf
in C. Calling cin
object is much slower than calling scanf
function as usual but when I was reading the accepted answer, I understood if we call std::ios::sync_with_stdio(false);
, cin
synchronization with scanf
is turned off and cin
speed becomes so faster and even faster than scanf
in this case.
So, will we face some problems if we turn it off? If so, what problems, and is it good to turn off cin
synchronization with scanf
in C? Thanks for helping.
ANSWER
Answered 2021-Feb-05 at 19:28If you use both sets of I/O functions (header or
and also
) on the same stream (e.g. the
stdin
stream is associated with both scanf
and cin
), then you'd better leave them synchronized.
If any one stream only uses one I/O family you can turn off synchronization (you can still use fscanf
with a particular file and cin
with stdin
for example, as long as separate streams are involved).
QUESTION
I've installed Microsoft VSCode under Linux Mint, and opened a folder named test1 containing 3 files:
test.cpp - pre-declares foo() and bar(), then calls both functions in main()
foo.cpp - defines function foo()
bar.cpp - defines function bar()
When I compile test.cpp (using F5 Start debugging in VSCode) it fails with undefined reference to foo() and undefined reference to bar(). When I compile foo.cpp and bar.cpp, they both fail with undefined reference to main.
I found VS Code will not build c++ programs with multiple .ccp source files as asked here previously, from which I discover I can type the following in the VSCode "Terminal" window...
g++ test.cpp foo.cpp bar.cpp -o a.out
./a.out
...and my program compiles and runs as expected (but I can't do any debugging, obviously).
So what I want to know in the first instance is How do I tell VSCode to compile and link in those two additional source files?
Unless it's going to be blindingly difficult, I'd also like some guidance on how to go about moving on to Phase 2 of my task - compiling foo and bar into a "library" file that I can link across to when working on a project in folder test2 (sibling to test1).
If at all possible, I'd like to achieve this entirely within the context of the VSCode environment (maybe I'll think about learning the complexities of g++ and makefiles sometime in the future).
...ANSWER
Answered 2021-Jan-01 at 15:31First make the a.out
file first and change the /.vscode/lauch.json
file. In that file change the "program": "whatever"
to "program": "${workspaceFolder}/a.out"
and if there is a "preLaunchTask": "C/C++: g++ build active file",
then cut that line then press F5 and the debugger should work fine.
Check out here for more clearification.
QUESTION
Thanks for answering my question. I am working for a project recently. In this project, I write a shared library and set the LD_PRELAOD
to the shared library's path. I want to intercept some programs' system calls by using this shared library, such as socket(), bind(), send()
. It works for C-programs and Python-programs, but it doesn't work for Golang-programs. Later I know that Go-programs comply with the static libraries.
So I tried this command: go build -linkshared
, unlucky, it failed.
Finally, I use the command nm
to check the symbols in the application.
And I found these:
ANSWER
Answered 2020-Aug-04 at 05:26Why don't the programs implemented by Go[...] use the functions of libc.so.6.
Because Go uses direct syscalls to the underlying OS.
QUESTION
I'm writing a program said in this post title. I take reference at this webpage.
Here are the codes from that webpage.
...ANSWER
Answered 2020-Jul-26 at 22:07Your program should compile and run correctly follows:
QUESTION
I got this code from another answer to a similar question, but I can't figure out why this is not working for me. The test.csv is in the same folder as the compiled .exe file, but it doesn't find it. I tried the full system path ("C:\Users\hhv\eclipse-workspace\oncemore\Debug\test.csv") but it still fails to open the csv.
So I am at a lose over what's going on because every other example I have looked at looked like this should be working. Ex: https://github.com/tpatil2/C-Programs/blob/master/RWcsv/rwcsv.cpp
...ANSWER
Answered 2020-May-25 at 19:33The path is relative to the current working directory (where the program is executed), not to the source file. Also when you use backslashes in the file path you must escape them like so "C:\\Users\\hhv\\eclipse-workspace\\oncemore\\Debug\\test.csv"
QUESTION
I am using async await in WPF on the UI-Thread. I have a question on how async await works in a certain scenario. I will try to explain it on an example.
BackgroundLet's assume I have the Button A with click event handler ButtonA_Click()
and Button B with ButtonB_Click()
. The click handlers will check if the RunLoop()
method is still running. If it is not running, they start RunLoop()
.
- Will the event handler return from the UI-Thread when (the outer)
await RunLoop()
is called? - Or will it return at the (inner) await in
RunLoop()
because there is synchronous code (_isStopped = false;
) it could perform in the beginning ofRunloop()
.
If 1. is true, it could cause a racing condition, or? When both click handlers are called at the same time, they will run right after each other on the UI-Thread. So the second event handler may run before RunLoop() can be executed for the first time. In this case _isStopped would still be false for the 2nd event handler and it would start a RunLoop()
, too. Thus 2 RunLoop()
would be active. Is that correct?
(PS: I know, that if 1. is the case, I can solve this by putting _isStopped = false
into the click handlers, but this question is more about understanding how async await works when the methods are nested this way).
ANSWER
Answered 2019-Nov-18 at 18:39It's gonna be the second option. Code in an async
method runs synchronously until it encounters an await
statement awaiting a non-completed Task
.
Note that it might run synchronously all the way if all awaited Tasks
are finished before being awaited, or if none of the code actually needs an await
statement.
QUESTION
I have a Makefile that compiles two Linux kernel modules (mod1.c
and mod2.c
).
ANSWER
Answered 2020-May-07 at 20:31The kernel uses variables to set kernel modules on/off:
QUESTION
So, I am starting to familiarize with C, and at this point I'm trying to understand pointers. I got the following code from here, but I cannot comprehend, how does one subtract a character array from a pointer.
...ANSWER
Answered 2020-Feb-06 at 13:41Assuming you're wondering about the expression found-s
, then what's happening is that you subtract two pointers.
Arrays naturally decay to pointers to their first element. That means plain s
is equal to &s[0]
, which is what's happening here: found-s
is equal to found - (&s[0])
.
And the subtraction works because found
is pointing to an element inside the array s
, so the pointers are related (which is a requirement for pointer subtraction). The result is the difference (in elements) between the two pointers.
QUESTION
I need to compile some c-programs using cfitsio
library in Google colab, in my mac I can do following:
ANSWER
Answered 2020-Jan-14 at 17:27No need for sudo
. On Colab, you're already running as root.
Here's a complete example notebook:
https://colab.research.google.com/drive/1RqtDwzhL8vWEJ-3ruGUGo-QckWr6gHUJ
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