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Message from discussion segmentation fault (SIGSEGV)
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Louis Krupp  
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 More options Jun 2 2010, 8:54 am
Newsgroups: comp.lang.fortran
From: Louis Krupp <lkrupp_nos...@indra.com.invalid>
Date: Wed, 02 Jun 2010 06:54:12 -0600
Local: Wed, Jun 2 2010 8:54 am
Subject: Re: segmentation fault (SIGSEGV)
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On 6/2/2010 6:24 AM, mecej4 wrote:

> dpb wrote:

>> Louis Krupp wrote:
>>> On 6/1/2010 9:40 PM, Ron Shepard wrote:
>> ...
>>>> You must be thinking of some other language.  Other languages do
>>>> sometimes do silent conversions to match arguments.

>>> So reals aren't truncated to integers?

>> In argument lists?  No, a REAL in a CALL statement for a routine
>> expecting an INTEGER will generate a mismatched argument type error (in
>> the module during compilation) and a mismatched call if forced to link
>> outside of one where a compiler may not be able to tell of the mismatch.

>> --
> To add to what dpb said: If the expected INTEGER is used as a subscript but
> a real (or another mismatched type) was passed instead, a prompt SEGFAULT
> may be expected.

Likely (given the format of IEEE floating point, for example), but not
necessarily (if a high virtual address plus garbage with high-order bits
turned on wrap around to a low, valid virtual address).

The same thing would happen in that Other Language with which I'm more
familiar.

Louis


 
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