I wrote a code in C and it executed perfectly but at the end I got a line saying "Program ended with exit code: 0". What does this line signify and how do I get rid of this?
What it is?
an exit code of 0 indicates no error. If a program wants to
indicate there was something wrong when it exited it will exit with
a non-zero value.
How to get rid of it?
Do not use the IDE for program execution. – as BLUEPIXY said.
Basically what it means is that the program ran without any error. A 0 usually says that the program executed properly. Any nonzero number denotes some problem. Use text editors such as emacs or vim etc. and compile and execute your program.
The message doesn't come from your program itself, but from the IDE (e.g. Visual Studio) that launches the program. Try launching it from the command-line or by double-clicking the .exe file.
The meaning of "exit code 0" is usually: Everything went fine, the program exited successfully. Other exit codes usually stand for aborts because of errors and the actual number gives a hint about the type of error that occurred.
Related
First of all I'm at the first year of computer science so I'm a beginner in programming yet, then forgive me for my lack of knowledge. Well, my problem basically is an error that is shown in the screen everytime when I try to run(by the way I'm using Sublime Text) a program in C. In this case was a simple code:
#include <stdio.h>
int main() {
//print the heading of the game
printf("*****************************************\n");
printf("* Wellcome to the our guessing game *\n");
printf("*****************************************\n");
int secretnumber = 42;
int guess;
printf("What is your guess?");
scanf("%d", &guess);
printf("Your guess was %d \n", guess);
}
OUTPUT:
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: cannot open output file Olamundo.exe: Permission denied
collect2.exe: error: ld returned 1 exit status
[Finished in 0.3s]
You know, i tried some solutions like move the folder where the executable lies and place it in the root(in my case Mateus(C:)), give all the permissions to the folder, turn off the antivirus(in my case i just using the Windows defender), finish the task using the the Task manager but nothing worked. Please, help me i really don't know what else i can do.
Overall, your problem is that you're trying to run a program that is interactive from within Sublime; it doesn't support that. Sublime captures output your program sends to stdout and stderr and displays it in the output panel, but it does't connect the panel to stdin.
So, the scenario you're encountering works like this:
You run your program, which is interactive (in your case it prompts for input via scanf(), and it launches and prompts you for input
You try to enter input, but nothing happens because stdin isn't connected.
You try to run your program again (or modify it and build it again thinking you might have an issue).
The version you previously tried to run is still running in the background waiting for input you can't provide, and windows locks executable files while the program is running. So, when the linker (collect2) tries to link the executable during the build, it can't because the file is locked, hence the permission error.
You can clear the error by killing the program running in the background, which you can do via the Tools > Cancel Build if you do it before this error occurs; if you've already seen the error this likely won't work because this only cancels the most recent build, which would be the one where the error occurred.
The other thing you can do is use something external to kill it; the task manager on windows, kill from a terminal on Linux/OSX, etc. You'll need to do it this way if you're already seeing the error.
Note however that this doesn't solve your underlying problem because you're still trying to run an interactive program. In order to do that from within Sublime you need to create a custom sublime-build that allows for this. Generally you'd either have it spawn an external terminal and run the program in there, or use a package like Terminus if you want to keep it internal.
In order to set this up, you need to be familiar with the sequence of commands that are needed to compile, link and run a program in one command, which you can get by checking what the build system you're currently using is (assuming you didn't create it yourself).
This video on buffering and interactive builds in Sublime (disclaimer, I'm the author) has information and examples of how Terminus can be used for something like this if you'd like more information.
I am working on this piece of code, trying to learn basic C programming.
I managed to compile and run a basic program.
Then, when I try to run a code on which the compiler raises an error, the problem starts -- from then on I get:
c:/mingw/bin/../lib/gcc/mingw32/4.9.3/../../../../mingw32/bin/ld.exe: cannot open output file tests.exe: Permission denied
collect2.exe: error: ld returned 1 exit status
mingw32-make.exe[3]: *** [tests.exe] Error 1
mingw32-make.exe[2]: *** [CMakeFiles/tests.dir/all] Error 2
No matter what I change to code to, even to just a basic int main() {return 0;} code, I keep getting that problem.
Edit (integrated from comment):
Found the solution, I had the program still running and I had to manually stop it. I am used to python/java, where once you get an error the program stops. Should it not be like that in C as well?
I assume the error that triggers the linker failure later on is actually a runtime error, not a compiler one.
As you have found out, Windows cannot overwrite a file which is opened in a running program (or is the running program itself), hence the error when ld.exe (the linker) tries to create a new executable.
The most probable cause is that you are starting your program in debug mode (the green beetle icon) instead of a normal run (the green "play" arrow). This attaches a debugger (probably gdb) to your program. When your program crashes, the debugger stops it in its tracks and waits for you to investigate, thus keeping the process alive.
Make sure the debug tools are not hidden in some way, or just launch your program without a debugger when you want it to fail fast.
I am using Code::Blocks for programming in C. When I compile my program and execute it, the output window (i.e.. Windows Command prompt) displays some execution related text, these texts are not of use to me right now and dont want them to appear(see text below).
Hello, World!
Process returned 0 (0x0) execution time : 3.920 s
Press any key to continue.
I tried to change the settings in Code::Blocks but couldn't find any settings related to the output window and also I dont want the text "Press any key to continue" to appear. These texts appear only if I run the program through Code::Blocks and doesn't appear if I directly run the program.
Unfortunately, some things just cannot be changed, and that is one of them. There are some quirks used by some IDE's that just drive programmers crazy, but it can't be helped. There is a reason why it's there: the execution data can be used to find out whether the program worked properly (e.g. ended execution). You can use this data later when targeting execution time as one of the main focuses in coding the project. There may be other uses for it as you code more and more advanced projects.
It only appears when you execute your code from the compiler. It does not need getch() function to stop the screen.
But if you execute its .exe file directly, outside the compiler, you will notice that annoying message 'Process returned 0 (0x0) execution time : 3.920 s' doesn't show anymore. Moreover, you will need getch() function to stop the screen.
you may need to include stdio.h and then call getchar() before return 0
for example;
#include <iostream>
//add this library
#include <stdio.h>
using namespace std;
int main()
{
cout<<"I am a C++ programmer! "<<"Awesome!";
//add this line of code
getchar();
return 0;
}
I am new to C programming. In my program below, I am simply trying to immediately, exit the C program without see any additional dialog, if the programs receives the input "quit".
I am trying to accomplish this using exit(0); however, before the program exits it outputs something like
success
process exited with return value 0
Press any key to continue...
I am trying to avoid this dialog and exit the program immediately. Is this possible?
I appreciate any help with this.
Many thanks in advance!
My C Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(void) {
char command1[256], command2[256];
printf("# ");
scanf("%s", command1);
if(strcmp(command1,"quit")==0){
printf("success");
exit(0);
}else{
printf("unknown command");
}
system("PAUSE");
return 0;
}
The message that you see is actually generated by the Visual Studio debugger. It's not really coming from your program.
If you would like to verify that your program is not actually displaying any message (nor waiting for a key press) just try running it from a windows command prompt. You may also try running the program in "Release" mode from withing Visual Studio. That will also confirm this.
The reason the debugger displays that information is just to help you understand what is going on with your program.
Can you post details of your execution environment? Seems like your process is being monitored for an exit code by another application (specialized shell perhaps) which is printing the "Press any key to continue" line
The process exited with return value 0 certainly isn't coming from your code, rather a program in the middle of your input and the output.
I compiled this on the command line (Mac OSX) and was presented with the following output:
James:Desktop iPhone$ gcc code.c
James:Desktop iPhone$ ./a.out
# quit
successJames:Desktop iPhone$
Note that I didn't reach the system("PAUSE"); either
That output doesn't come from YOUR program, it comes from the program that runs your program. Most likely "Visual Studio", but I expect some other types of IDE's may do similar things.
If you are using Dev-C++ and you would like to get rid of the message, do this:
Tools Menu -> Environment Options -> General tab
Then uncheck the Pause Program after return option.
Source: http://www.cplusplus.com/forum/general/89249/
[This question is not about fixing the error. But about redirecting it]
I have a program (C/linux) which displays error on the console due to missing shared library. It says "can't load library ...." . How can I redirect this output into a file ?
I tried this inside my program:
close(2);
open("/home/user/test.txt", O_CREAT|O_RDWR);
It correctly redirects the output generated from the program printfs. But the "can't load library ...." still comes on console!
I don't want to use the > operator for this purpose. I want to do it from inside my program. Any suggestions?
Thanks
The error message is generated by the loader, which happens before the program even starts. So there's nothing you can do from within a program that doesn't even get to run to influence the behaviour of the loader.
If you really need to fiddle with the file descriptors used by the shell, check out the exec shell command to close and redirect file descriptors permanently. That way you can get around using the redirection operator >, although that's arguably a far less tidy approach.
You will need a wrapper program. It could be a shell script. Do the redirection then try to run the original program.
A program cannot catch errors that happen to it before it even starts running. Library link happens before any other code runs.
Seems like the message is generated before your program starts - so to redirect it, you'll have to use the 2> operator. Otherwise you'll have to use the dlopen... etc. calls to do the linking on runtime.
try making sure that the environment variable LD_LIBRARY_PATH is correct.
that warnings & error mesages comes befor your program starts to work so only option is > operator
use this way
./a.out >& filename