Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!philabs!cmcl2!seismo!rochester!ritcv!ccice5!ccivax!rb
From: rb@ccivax.UUCP (rex ballard)
Newsgroups: net.lang.c
Subject: Re: type cast in initializer
Message-ID: <392@ccivax.UUCP>
Date: Tue, 11-Feb-86 22:37:56 EST
Article-I.D.: ccivax.392
Posted: Tue Feb 11 22:37:56 1986
Date-Received: Fri, 14-Feb-86 06:06:47 EST
References: <302@hsi.UUCP> <1450@bbncc5.UUCP> <305@cray.UUCP> <269@spp3.UUCP>
Reply-To: rb@ccivax.UUCP (What's in a name ?)
Organization: CCI Telephony Systems Group,  Rochester NY
Lines: 20

In article <269@spp3.UUCP> ansok@spp3.UUCP (Gary Ansok) writes:
>
>Are there any other cases where casts are NEEDED besides:
>
>	function calls:  doub_var = sqrt((double) int_var);
>	pointer punning: long_var = *(long *) char_ptr;
>
	Yes, accessing members of structures.
	ie:
	struct x y;
	struct i j;
	i.memb=y.memb;  /* some compilers hate this */
	should be written:
	i.memb= ((struct i)x).memb;

	this is especially true if both structures contain 'memb' but
	'memb' is different type or placement.
	A union is probably preferred.