From: Paul Eggert <eggert@cs.ucla.edu>
Date: Mon, 29 Jan 2024 07:35:49 +0000 (-0800)
Subject: seq: say why not ‘x += step’
X-Git-Tag: v9.5~73
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ec1fb46aba4b72623e4aab1a682466f68f5fdf3;p=thirdparty%2Fcoreutils.git

seq: say why not ‘x += step’

* src/seq.c (print_numbers): Add comment.
---

diff --git a/src/seq.c b/src/seq.c
index 3d2c1c2ea2..ad16f27018 100644
--- a/src/seq.c
+++ b/src/seq.c
@@ -307,7 +307,11 @@ print_numbers (char const *fmt, struct layout layout,
             write_error ();
           if (out_of_range)
             break;
+
+          /* Mathematically equivalent to 'x += step;', and typically
+             less subject to rounding error.  */
           x = first + i * step;
+
           out_of_range = (step < 0 ? x < last : last < x);
 
           if (out_of_range)