From: David Kastrup <dak@gnu.org>
Date: Mon, 25 Jun 2007 05:08:54 GMT
Subject: Re: [PATCH] diff: round down similarity index
Message-ID: <85y7i8boyh.fsf@lola.goethe.zz>
In-Reply-To: <467EEEE6.3090100@lsrfire.ath.cx>

René Scharfe <rene.scharfe@lsrfire.ath.cx> writes:

> +static int similarity_index(struct diff_filepair *p)
> +{
> +	int result = p->score * 100.0 / MAX_SCORE;

Use floor(p->score ... MAX_SCORE) here: I don't think that C otherwise
specifies a preferred way of rounding on float->int conversions.

> +	/* Paranoia: guard against floating point rounding errors. */
> +	if (p->score == MAX_SCORE)
> +		result = 100;
> +	else if (result == 100)
> +		result = 99;

Also, p->score itself must be calculated by truncating.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum