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From: CXT105@PSUVM.BITNET (Christopher Tate)
Newsgroups: comp.sys.mac.programmer
Subject: Stupid LightspeedC question
Message-ID: <72138CXT105@PSUVM>
Date: 17 Feb 89 16:34:51 GMT
Organization: Ghostwheel, Inc.
Lines: 31

Ok, here's another one.  I've written a couple of functions to convert from
degrees to radians and back, and I can't get them to work correctly (read: the
way I want them to).

When I use the following function declaration:

          #include <math.h>           /* this gets the PI definition */
          double deg_to_rad(x)
          double x;
          {
               return (x*PI/180);
          }

the routine returns the same value regardless of what I pass as x.  The only
way I have found to get it to work (based on the assumption that a parameter of
type double cannot be passed ordinarily, since it's 10 bytes long) is to
declare the function thus:

          #include <math.h>
          double deg_to_rad(x)
          double *x;
          {
               return ((*x)*PI/180);
          }

and pass a pointer to a predefined variable of type double as x.

The question is this:  is there any way I can rig it so I can pass the argu-
ment by value (as in the first example), so I can use constants as parameters?

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Christopher Tate      ||      "I hate quotations!" -- Ralph Waldo Emerson