Xref: utzoo comp.lang.c:15648 comp.sys.ibm.pc:23479
Path: utzoo!attcan!uunet!sdrc!scjones
From: scjones@sdrc.UUCP (Larry Jones)
Newsgroups: comp.lang.c,comp.sys.ibm.pc
Subject: Re: using floats in functional prototypes
Summary: old-style definitions take widened args
Keywords: float, MS-C 5.1, QC, Turbo C, Help Please!
Message-ID: <508@sdrc.UUCP>
Date: 19 Jan 89 22:36:24 GMT
References: <1989Jan18.092522.14499@gpu.utcs.toronto.edu>
Organization: Structural Dynamics Research Corp., Cincinnati
Lines: 31

In article <1989Jan18.092522.14499@gpu.utcs.toronto.edu>, romwa@gpu.utcs.toronto.edu (Royal Ontario Museum) writes:
> When I compile the two files, I get a warning that the type of
> the argument in the prototype doesn't match the declaration
> 
> void afunc( float );
> 
> void afunc( flt_val )
> float flt_val;
> {
>   int i;
> 
>   i = 3;
> }

The problem is that you have witten the function definition using
the old-style syntax.  When you do that, the function expects to
be called with widened arguments (i.e. the float argument will
actually be passed as a double).  To fix the problem, either
change the float in the prototype to double or write the
definition using prototype form:

	void afunc( float flt_val )
	{
	}

----
Larry Jones                         UUCP: uunet!sdrc!scjones
SDRC                                      scjones@sdrc.UU.NET
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