From f35bc3ee87e1771891e2087363381bda616e67ee Mon Sep 17 00:00:00 2001 From: Robert Griesemer Date: Wed, 22 Jul 2015 12:33:21 -0700 Subject: [PATCH] math/big: document rounding for Rat.FloatToString Fixes #11523. Change-Id: I172f6facd555a1c6db76f25d5097343c20dea59a Reviewed-on: https://go-review.googlesource.com/12507 Reviewed-by: Alan Donovan Reviewed-by: Russ Cox --- src/math/big/ratconv.go | 3 ++- src/math/big/ratconv_test.go | 2 ++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/src/math/big/ratconv.go b/src/math/big/ratconv.go index 778077b96e..961ff649a5 100644 --- a/src/math/big/ratconv.go +++ b/src/math/big/ratconv.go @@ -205,7 +205,8 @@ func (x *Rat) RatString() string { } // FloatString returns a string representation of x in decimal form with prec -// digits of precision after the decimal point and the last digit rounded. +// digits of precision after the decimal point. The last digit is rounded to +// nearest, with halves rounded away from zero. func (x *Rat) FloatString(prec int) string { if x.IsInt() { s := x.a.String() diff --git a/src/math/big/ratconv_test.go b/src/math/big/ratconv_test.go index 16b3a19418..da2fdab4ca 100644 --- a/src/math/big/ratconv_test.go +++ b/src/math/big/ratconv_test.go @@ -113,6 +113,8 @@ var floatStringTests = []struct { {"1", 0, "1"}, {"1", 2, "1.00"}, {"-1", 0, "-1"}, + {"0.05", 1, "0.1"}, + {"-0.05", 1, "-0.1"}, {".25", 2, "0.25"}, {".25", 1, "0.3"}, {".25", 3, "0.250"},