Running C Program in Cygwin doesn't generate any outcome

Question

While writing a simple C Program i encountered the problem that "printf" doesn't generate any outcome. Code:

#include<stdio.h>
int main()
{
printf("Hello World\n");
}

Cygwin log after compiling and running:

MMGV@Philipp /cygdrive/c/users/MMGV/Desktop/Programme
$ gcc test.c -o test.exe

MMGV@Philipp /cygdrive/c/users/MMGV/Desktop/Programme
$ test.exe

MMGV@Philipp /cygdrive/c/users/MMGV/Desktop/Programme
$

No error message, simply nothing. Opening the generated .exe in the Windows GUI does not work either. Thanks for any help!

try adding \n after your message. Buffers may not be flushed if no end of line. — Jean-François Fabre
– Jean-François Fabre ♦, Commented Nov 4, 2016 at 19:41
A newline should be there in any case. If you can confirm that the problem still occurs with the newline, please add it to the code in the question. How exactly did you try to run the program? Did you type something like ./hello at a shell prompt? Did you double-click on the .exe file in the Windows GUI? — Keith Thompson
– Keith Thompson, Commented Nov 4, 2016 at 19:47
I do not know about cygwin, but usually in Windows if you run a program with console output it will open the console, print the message, then close the console before you can even know it has happened. Solution: add getchar() at the end of the program, or run it from a console window. — Weather Vane
– Weather Vane, Commented Nov 4, 2016 at 19:51
"Long story short,"? I think you rather made a short story long! "Did not work" is not a helpful diagnostic. I suggest that you edit your question, remove the unnecessary back story and apologies and other waffle, and post the exact code (including the \n advised by Jean-F), the command line you have used to build it, all the compiler output generated during build, and the command line you have used to run the code - a verbatim log of your entire Cygwin session in short. — Clifford
– Clifford, Commented Nov 4, 2016 at 19:52

Weather Vane · Accepted Answer · 2016-11-04 20:05:31Z

2

Change your program to

#include<stdio.h>
int main()
{
    printf("Hello World\n");           // add newline
    getchar();                         // wait for an input (newline)
}

Because in Windows, the console window probably closes before you have a chance to see it.

answered Nov 4, 2016 at 20:05

Weather Vane

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2 Comments

Maspital Over a year ago

Does work for the Windows GUI, thanks. But why do i still see nothing in Cygwin?

Weather Vane Over a year ago

cygwin is unknown to me. I just use MSVC from console, not even the IDE.

user58697 · Accepted Answer · 2016-11-04 20:48:26Z

2

You are not running your program. Cygwin shell by default doesn't have current directory in the path. test.exe is resolved to a standard Unix-like utility (try which test). You need to specify current directory explicity:

$./test.exe

answered Nov 4, 2016 at 20:48

user58697

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Comments

SHRIKANT PATIL · Accepted Answer · 2020-09-20 13:39:14Z

0

This worked!

#include <stdio.h>
#include <stdlib.h>

int main(void){
  printf("Hello World.\n");
  return EXIT_SUCCESS;
}

cmd:

HP@LAPTOP-VUS0RJO0 /cygdrive/c/cygwin64/home/shri
$ gcc -o first first.c

HP@LAPTOP-VUS0RJO0 /cygdrive/c/cygwin64/home/shri
$ ./first.exe
Hello World.

HP@LAPTOP-VUS0RJO0 /cygdrive/c/cygwin64/home/shri
$

answered Sep 20, 2020 at 13:39

SHRIKANT PATIL

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