Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!uxc!iuvax!rutgers!att!ulysses!andante!alice!ark
From: ark@alice.UUCP (Andrew Koenig)
Newsgroups: comp.lang.c
Subject: Re: Problem returning doubles from a function
Message-ID: <9099@alice.UUCP>
Date: 24 Mar 89 23:18:48 GMT
References: <39722@csvax1.cs.tcd.ie>
Organization: AT&T Bell Laboratories, Liberty Corner NJ
Lines: 46

In article <39722@csvax1.cs.tcd.ie>, omahony@csvax1.cs.tcd.ie (Donal O'Mahony - OMAHONY@cs.tcd.ie) writes:

> #include <stdio.h>
> main()
> {double a,b;
> 
>   a = 1.234;
>   b = store_length(a);
>   printf("b=%f\n",b);
> }

If store_length returns a double, you must declare it as such:

	#include <stdio.h>

	double store_length();

	main()
	{
		double a,b;

		a = 1.234;
		b = store_length(a);
		printf("b=%f\n",b);
	}

In ANSI C, it looks like this:

	
	#include <stdio.h>

	double store_length(double);

	main()
	{
		double a,b;

		a = 1.234;
		b = store_length(a);
		printf("b=%f\n",b);
	}

Failure to declare such functions is a common C pitfall.
-- 
				--Andrew Koenig
				  ark@europa.att.com