[mpich-discuss] scanf with MPICH2 for Win7

[Alejandro Allievi]

Hi Rajeev,

It worked, thanks a lot!!

Would you have an idea of why I need to force the writing of buffered
data in the output stream in Win and not in UNIX??

Would fflush(NULL) be equivalent or preferable??

Thanks for your help again.

Alex

On Thu, Mar 22, 2012 at 11:35 PM, Rajeev Thakur <thakur at mcs.anl.gov> wrote:
> Try adding an fflush(stdout); after the printf.
>
> On Mar 22, 2012, at 4:25 PM, Alejandro Allievi wrote:
>
>> Hi,
>>
>> I'm running a Get-input(...) function that takes input from stdin with
>> the following code  snippet
>> ......
>>
>>   if (my_rank == 0) {
>>      printf("Enter a, b, and n\n");
>>      scanf("%lf %lf %d", a_p, b_p, n_p);
>> ...
>> }
>>
>> It compiles and runs giving the right result, no problem. HOWEVER, the
>> scanf seems to execute before the printf. In other words, when I run
>> the program I need to enter a, b and n and then "Enter a, b, and n"
>> appears on my screen, and the program runs correctly to completion. It
>> does not happen in UNIX, only happens in MPICH2 for Win7 64bit.
>>
>> Has anybody encountered this problem or has any hints on its cause???
>>
>> Thank you.
>>
>> Alex
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-- 
Dr Alejandro Allievi, PhD, PEng

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