This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
How to stop C++ console application from exiting immediately?
I created an exe file in c. When I run it command prompt opens and then closes quickly and I cannot see the output. The program takes no runtime values from users. It reads data from a file. Is there any way to prevent this?
Run it natively from the command line.
Let's say that your file is in C:\awesomeness.exe
Open the cmd, type cd C:\ and then type awesomeness.exe
One classic way to do it:
#include <stdio.h>
int main() {
puts("hai");
getchar();
}
This will wait for keypress at the end.
Are you in Windows? If so, a quick and dirty way is to use the system() function in stdlib.h (make sure you include it) to execute the PAUSE command in the command prompt.
system("PAUSE");
If you are using Visual Studio, hit CTRL + F5 instead of F5 in order to run your program.
Using 'system("pause");' before ending main() is the most common method.
int main() {
...
...
system("pause");
}
Related
I've been coding for a while with codeblocks and I've coded some C programs. In my project folder of my programs there is the .exe file that I used to click on and get its console output. But today when I click on them and when the program ends it closes instantly without asking me to press a key to quit the program.
The solutions for this problem I've found are to add "system("pause")" and other stuff like that or to compile it directly on the cmd or on codeblocks(and they don't fix the problem as well). But I would like to know how I could be able to open the .exe files like back then.
did you try something like that at the end of your program?
scanf("%c",waitVar);
You can write
printf("Press ENTER key to Continue\n");
getchar();
at the end of your code. The same question can be found here:
how to prevent c program from closing immediately after running
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
How to stop C++ console application from exiting immediately?
I created an exe file in c. When I run it command prompt opens and then closes quickly and I cannot see the output. The program takes no runtime values from users. It reads data from a file. Is there any way to prevent this?
Run it natively from the command line.
Let's say that your file is in C:\awesomeness.exe
Open the cmd, type cd C:\ and then type awesomeness.exe
One classic way to do it:
#include <stdio.h>
int main() {
puts("hai");
getchar();
}
This will wait for keypress at the end.
Are you in Windows? If so, a quick and dirty way is to use the system() function in stdlib.h (make sure you include it) to execute the PAUSE command in the command prompt.
system("PAUSE");
If you are using Visual Studio, hit CTRL + F5 instead of F5 in order to run your program.
Using 'system("pause");' before ending main() is the most common method.
int main() {
...
...
system("pause");
}
This question already has answers here:
system("cd <path>") in a C program
(3 answers)
Closed 5 years ago.
I'm able to use popen to run just about any program, but apparently not cd:
#include <stdio.h>
void main() {
FILE *fp = popen("cd", "w");
pclose(fp);
}
I'd expect that to change directory to home but nothing happens. Changing to "r", or changing to e.g. "cd ~", "cd /", does not help. Using system has about the same result, i.e. works for anything but cd. So how is it done? The answers here don't work for me. Thank you.
cd is generally a shell internal command, NOT an executable.
Even if it were, in general no process can change another process's working directory, so it would change the cwd for the "cd" process and then upon exit it'd be gone.
I want to know how to execute a command from a c program,on windows os.
To be more specific how to write a c program whose output will not be printed but directly goes to command prompt and get executed there? please help me
I think you need to use system() command in your C code.
For example:
system("pause");
where "pause" is the command to be executed in cmd.
reference: http://www.cplusplus.com/reference/cstdlib/system/
I hope i got your question right.
I'm not sure I understand the question correctly. But if I do, you're looking for the system() function.
I suspect what you are describing is the the back-ticks in shells in Linux/Unix.
However, I don't know how to do that in Windows.
Unix way
myprompt> `./a.out`
If the C program was basically: printf("ls -l .\n");, then this should list the files.
Is that what you wanted?
Like I said, I don't know how to do that in the Win Cmd Prompt, but maybe this clarifies your question.
Looks like you could try:
C:\MyDir> MyProgram.exe | cmd.exe /C
This question already has answers here:
Closed 13 years ago.
Possible Duplicate:
What is the Best Practice for Combating the Console Closing Issue?
How do you keep the console from closing after the program is done in C? When I try to search for it I find lots of stuff about C++ and other languages, but nothing for C. Also, even for C++ there doesn't seem to be a definitive answer.
So could someone please let me know what the simplest way (doesn't need to be super elegant) way to keep the console open after a C program is done running?
The previous answers are all assuming that you want to invoke the console app and then essentially leave it "running" and waiting for user input to terminate. If this is the correct assumption, then +1 to GMan's answer. However, if you are asking how to invoke this console app from either a shortcut, Start->Run or some other mechanism and leave the cmd window open, then you will need to invoke it via cmd.exe itself with the /k option like so:
cmd.exe /k "foo.exe"
This will start a cmd window, run your console app, and then leave the cmd window open. This will address #Thanatos above. He's correct in that you should let the console app close. Again, for me it's unclear what you're really asking for what the end goal should be.
If I made the wrong assumption(s), feel free to -1 me.
run the program from the command
line, instead of executing it
directly.
Ctrl+F5 in Visual C++.
Console applications are meant to be run from the console. If you do that, after running you'll be left with your console window, and can easily view the output of your program.
You can use something like getchar() to force the application to wait for a key-press.
Let the console close.
If you prohibit, in the program, the console from closing, it will make automation with your program difficult, or it will make the format of the program's input strange.
Instead, fix whatever's running the program in the first place, to not close the terminal window in the first place. If this is MS Visual Studio, try F5 (Start without debugging). If you need debugging, place a breakmark at the program's end. Otherwise, open a command prompt/terminal and run the program there yourself.
1) Your IDE opens the console before the program begins.
2) your program ends
3) the IDE closes the console
a) Just tell the IDE to not close the console ... or
b) make your program not end.
a) No idea how to do it.
b) right before the return 0; used to terminate the program add
printf("Press ENTER a few times to terminate the program");
fflush(stdout);
getchar(); getchar(); getchar(); getchar();
getchar(); getchar(); getchar(); getchar();
return 0;
You could use getch() at the end of your program.
Another way is to debug the program and place a break point before the end of the program.