Redirection at the prompt

[Aniruddha]

I had posted this to comp.os.msdos but I did not get an answer.
The program

// Hello.cpp
#include <iostream.h>
#include <stdio.h>
int main ()
{
printf ("Line1 \n");
cout<< "Line2 \n" ;
printf ("Line3 \n");
cout<< "Line4 \n" ;
printf ("Line5 \n");
cout<< "Line6 \n" ;
return 0;
}

when the output was redirected to a file:

c:\tc\bin> hello > a.txt
I could see all the 'cout' lines printed first and then printf lines.
Shouldn't it be in the same order as it appears? Why is it happening?
I am using the Turbo C++ 3.0 compiler.

 

[Hallvard B Furuseth]

I had posted this to comp.os.msdos but I did not get an answer.

Still the wrong newsgroup. For C++ programs, try comp.lang.c++.

 

[Thomas Matthews]

I had posted this to comp.os.msdos but I did not get an answer.
The program

// Hello.cpp
#include <iostream.h>
#include <stdio.h>
int main ()
{
printf ("Line1 \n");
cout<< "Line2 \n" ;
printf ("Line3 \n");
cout<< "Line4 \n" ;
printf ("Line5 \n");
cout<< "Line6 \n" ;
return 0;
}

when the output was redirected to a file:

c:\tc\bin> hello > a.txt
I could see all the 'cout' lines printed first and then printf lines.
Shouldn't it be in the same order as it appears? Why is it happening?
I am using the Turbo C++ 3.0 compiler.

This is an issue for the C++ language gurus.
See my reply in
--
Thomas Matthews

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http://www.raos.demon.uk/acllc-c++/faq.html
Other sites:
http://www.josuttis.com -- C++ STL Library book

 

[Jared Dykstra]

I had posted this to comp.os.msdos but I did not get an answer.
The program

// Hello.cpp
#include <iostream.h>
#include <stdio.h>
int main ()
{
printf ("Line1 \n");
cout<< "Line2 \n" ;
printf ("Line3 \n");
cout<< "Line4 \n" ;
printf ("Line5 \n");
cout<< "Line6 \n" ;
return 0;
}

when the output was redirected to a file:

c:\tc\bin> hello > a.txt
I could see all the 'cout' lines printed first and then printf lines.
Shouldn't it be in the same order as it appears? Why is it happening?
I am using the Turbo C++ 3.0 compiler.

Yes this is off topic, but the short answer is the output is buffered.

 

[Kevin Goodsell]

Yes this is off topic, but the short answer is the output is buffered.

<off topic>
That's certainly possible, but I don't see how it explains the observed
results. cout is synced with stdio by default. I don't know exactly what
that means, but I would assume that it means output appears in the order
it was sent, regardless of which method was used to send it.

I'm leaning toward a broken C++ implementation, but I'm not sure.
</off topic>

-Kevin