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From: levy@ttrdc.UUCP (Daniel R. Levy)
Newsgroups: net.lang.c,net.lang.f77
Subject: Re: Address of array
Message-ID: <807@ttrdc.UUCP>
Date: Tue, 25-Mar-86 22:30:33 EST
Article-I.D.: ttrdc.807
Posted: Tue Mar 25 22:30:33 1986
Date-Received: Fri, 28-Mar-86 06:11:28 EST
References: <750@abic.UUCP> <2293@utcsri.UUCP> <313@hadron.UUCP> <150@sdchema.sdchem.UUCP>
Organization: AT&T, Computer Systems Division, Skokie, IL
Lines: 39
Xref: watmath net.lang.c:8280 net.lang.f77:504

In article <150@sdchema.sdchem.UUCP>, tps@sdchem.UUCP (Tom Stockfisch) writes:
>[]
>Joe Yao replies
>>I don't really see what the problem is that people are moaning
>>about.  If you want a pointer to the array, the array name itself
>>coerces to a pointer containing the memory location at the beginning
>>of the array.  There is no such thing as a pointer to the whole
>>array:  that is a Pasqualische or Fortranian notion.

'Scuse me, can somebody educate me as to why that would be a "Fortranian"
(I withhold opinion on the Pascal allegation) notion?  I was under the
impression that most, if not all, Fortrans implement array references pretty
much the same way that C does:  by reference to the address of the first element
in the array, with offsets computed according to the subscripts and then
automatically dereferenced for use.   The only differences I could see is
in argument passing where C can pass things by value, whereas Fortran must
pass by reference.

        FORTRAN               C

      INTEGER I(1000) <--> int i[1000];
      J = I(50)       <--> int j = i[49];
      I(3) = 8        <--> i[2] = 8;
      CALL FOO(I)     <--> foo(i); /* pass address of first element */
      CALL FOO(I(3))  <--> foo(&i[2]); /* or of another? */
      ...                      ...
      SUBROUTINE FOO(K) <> foo(k)  /* and dereference on the "other side" */
      INTEGER K(1000)      int k[1000]; {
      WRITE(*,*)K(3)       printf("%d\n",k[2]);
      ...                      ...
      END                  }
-- 
 -------------------------------    Disclaimer:  The views contained herein are
|       dan levy | yvel nad      |  my own and are not at all those of my em-
|         an engihacker @        |  ployer or the administrator of any computer
| at&t computer systems division |  upon which I may hack.
|        skokie, illinois        |
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