Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!elroy.jpl.nasa.gov!jato!vsnyder
From: vsnyder@jato.jpl.nasa.gov (Van Snyder)
Newsgroups: comp.lang.fortran
Subject: Re: character function subprogram
Message-ID: <1991Apr11.224519.7607@jato.jpl.nasa.gov>
Date: 11 Apr 91 22:45:19 GMT
References: <1991Apr7.200854.25446@math.ufl.edu> <1991Apr7.211058.25661@math.ufl.edu> <1991Apr11.162324.9004@alchemy.chem.utoronto.ca>
Reply-To: vsnyder@jato.Jpl.Nasa.Gov (Van Snyder)
Organization: Jet Propulsion Laboratory, Pasadena, CA
Lines: 19

In article <1991Apr11.162324.9004@alchemy.chem.utoronto.ca> system@alchemy.chem.utoronto.ca (System Admin (Mike Peterson)) writes:
>In article <1991Apr7.211058.25661@math.ufl.edu> wang@math.ufl.edu writes:
>>This would, in my opinion, miss the point of conveniency of function
>>subprogram. My question is this: Why can't we call "cursor" directly
>>in the PRINT statement under Sun Fortran?
>
>This is mentioned in some FORTRAN manuals as a limitation - you are in
>effect trying to use the I/O libraries recursively in the original
>program, and some I/O libraries are not re-entrant in this way.
>Of course, FORTRAN-77 doesn't have to provide recursion.

It also violates section 12.11 of the standard: "A function must not be
referenced within an expression appearing anywhere in an input/output list
if such a reference causes an input/output statement to be executed."

-- 
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