CSE 305 Programming Languages Fall, 2003
Professor Shapiro
Homework 10
Maximum Points: 12
Due 9:00 am, Tuesday, November 25, 2003

Copy this file to a text file named hw10.txt, edit into it your
answers, and submit the file via the submit program by the deadline
given above.

1. (6) Design a small Perl test program to see if our Perl compiler
uses in, out, or inout mode for passing parameters.  Include below
this paragraph: a) your program; b) a copy of your test
compile-and-run; c) your conclusion.


2. (6) The text says, "In most Fortran implementations before Fortran
77, parameters were passed by reference.  In later implementations,
however, pass-by-value-result has been frequently used for simple
variable parameters" [p. 368].  Consider a Fortran subroutine,
Testit(n,m), called with the statement Call Testit(i,i).  If Fortran
is using call-by-reference, then, in the body of Testit, n and m will
be aliases of each other.  However, if Fortran is using
call-by-value-result, then n and m will not be aliases.  Use this idea
to test if the three Fortran compilers we have use call-by-reference
or call-by-value-result.  Include below this paragraph: a) your
program; b) a copy of your test compile-and-run for f77, f90, and f95;
c) your conclusion about the three Fortran compilers.