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Adding program [message #1742661]

Tue, 06 September 2016 13:05

Massimo Mancini

Messages: 24
Registered: September 2016

Junior Member

Dear all,

first of all I would like to say that is my first time I am using eclipse and for that reason I've being donig some simple exercise to practice and to get familiar with the C compilator.

So, as the adding program here below it show a simple adding program that after being lunched it doesn't ask to insert the input data (integer 1 & 2).

#include <stdio.h>

int main ( void )

{
int integer1;
int integer2;
int sum;

printf("Enter first integer\n");
scanf("%d", &integer1);

printf("Enter second integer\n");
scanf("%d", &integer2);

sum = integer1 + integer2;

printf("Sum is %d\n", sum);

return 0;

} /* fine della funzione main */

Why that? Is there somenting wrong or it is an eclipse setting problem?
(I am using the Mars version).

Thanks for your kind advice,
Massimo

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Re: Adding program [message #1742689 is a reply to message #1742661]

Tue, 06 September 2016 16:09

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

It worked for me but I think the problem is that the output stream (stdout) is buffered. It depends on your operating system and the library being used.

Try this at the beginning of your main
setvbuf(stdout, NULL, _IOLBF, 0);
This says to only buffer until an end of line is sent. Then the buffer is emptied.
There are other options. For example, _IONBF means no buffering.

More info: http://www.cplusplus.com/reference/cstdio/setvbuf/

Note this won't change std::iostream. There are different calls for that.

[Updated on: Tue, 06 September 2016 16:11]

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Re: Adding program [message #1742692 is a reply to message #1742689]

Tue, 06 September 2016 16:34

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

David:

The problem here was that the OP did not force the run configuration to allocate a console to the run. It is necessary for feeding input from the keyboard.

The output file buffering does not hurt here, as the prompts are finished with a newline.

---

Another thing is that the OP posted several nearly similar questions with slightly different headers. It lowers the probability of good responses.

--

Tauno Voipio

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Re: Adding program [message #1742705 is a reply to message #1742692]

Tue, 06 September 2016 17:10

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

I didn't see the other posts.
Not sure about the buffering.
I had to force line buffering for my system which has a rather large buffer otherwise.
What I posted is what I normally use.

[Updated on: Tue, 06 September 2016 17:37]

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Re: Adding program [message #1742711 is a reply to message #1742705]

Tue, 06 September 2016 18:43

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

I tried it on OS X 10.9.5, and it was sufficient to set the console allocation check in run configuration.

From a terminal (under Eclipse or stand-alone) it did run without any changes.

I do not know anything on the behaviour under any of the current Windowses, however.

For the other posts: There's one more here in CDT group and another in Newcomers.

--

-TV

--

Tauno Voipio

[Updated on: Tue, 06 September 2016 19:38]

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