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From: fjhenigman@watcgl.waterloo.edu (Frank J. Henigman)
Newsgroups: comp.sys.sgi
Subject: Passing floats - Is this a bug?
Message-ID: <11787@watcgl.waterloo.edu>
Date: 5 Oct 89 20:41:51 GMT
Distribution: comp
Organization: U of Waterloo, Ontario
Lines: 45


Take a look at the following program.

------------------------------------------------------------------
bar(x)
  float *x;
  {
  printf("bar:  %f\n", *x);
  }

foo(x)
  float x;
  {
  printf("foo:  %f\n", x);
  bar(&x);
  }

main()
  {
  float x = 1.0;
  foo(x);
  }
------------------------------------------------------------------

Here is the output of this program compiled and run on a 4D/120GTX with 3.1G

foo:  1.000000
bar:  1.875000

You get the same thing EVEN IF COMPILED WITH -float.


Compile it with gcc and you get:

foo:  1.000000
bar:  1.000000

--
fjhenigman@watcgl.uwaterloo.ca                       Computer Graphics Lab
fjhenigman@watcgl.waterloo.edu   Frank J. Henigman   University of Waterloo
 ...!watmath!watcgl!fjhenigman                       Waterloo, Ontario, Canada
-- 
fjhenigman@watcgl.uwaterloo.ca                       Computer Graphics Lab
fjhenigman@watcgl.waterloo.edu   Frank J. Henigman   University of Waterloo
 ...!watmath!watcgl!fjhenigman                       Waterloo, Ontario, Canada