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Problem with eclipse while running simple c program [message #1749358]

Mon, 05 December 2016 14:43

Eclipse User

Hi everybody, I'm new in this forum and I installed eclipse with minGW for my university's exam.
I was writing a simple c program to test eclipse installation and I noticed a big problem. There is a screen:
index.php/fa/27781/0/

On the console output It seems to run first the last line of the code (the acquisition of the number) and then the first printf with "Inserisci il numero" ("Write the number" in english)

If I go in the debug folder and I run the .exe, the program works perfectly.

Just for another exemple, with this program after saved and debugged, if i run the console the first printf does not appear until i insert a number
index.php/fa/27780/0/

I insert the number (5), then the program start the system pause and in the end the program start the first printf and the last.

Also for this program, if I run the exe from the debug folder, the program works perfectly.

I need a working eclipse program for my exam in jenuary, please help me and sorry for my bad english.
index.php/fa/27782/0/

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Re: Problem with eclipse while running simple c program [message #1749451 is a reply to message #1749358]

Tue, 06 December 2016 18:01

Eclipse User

Hi Cosimo,

Welcome to the world of buffering Smile

All of this is behaving as designed, once you know that the embedded console in Eclipse is not a terminal. By not a terminal it means that isatty or platform equivalent returns false. This causes the standard C library to change how stdout (used by printf) is buffered. Read more about it, perhaps start with this SO Q&A: http://stackoverflow.com/questions/3723795/is-stdout-line-buffered-unbuffered-or-indeterminate-by-default

Alternatively, you can experiment by removing the \n on your first printf, you should then also see "strange" buffering when operating at the command line.

Jonah

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