From 75736cc169631dfaaa48ad46a00e1bf31d830ec8 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Mon, 16 Dec 2024 15:38:43 -0800
Subject: fmt, strconv: document that exponent is always two digits

Except for %b where it is only one.

Fixes #70862

Change-Id: Ic423a799b73bfa534f4083f6544bb9cd639fef06
Reviewed-on: https://go-review.googlesource.com/c/go/+/636915
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
---
 src/strconv/ftoa.go | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/strconv')

diff --git a/src/strconv/ftoa.go b/src/strconv/ftoa.go
index 6db0d47e0f..bfe26366e1 100644
--- a/src/strconv/ftoa.go
+++ b/src/strconv/ftoa.go
@@ -44,6 +44,8 @@ var float64info = floatInfo{52, 11, -1023}
 // zeros are removed).
 // The special precision -1 uses the smallest number of digits
 // necessary such that ParseFloat will return f exactly.
+// The exponent is written as a decimal integer;
+// for all formats other than 'b', it will be at least two digits.
 func FormatFloat(f float64, fmt byte, prec, bitSize int) string {
 	return string(genericFtoa(make([]byte, 0, max(prec+4, 24)), f, fmt, prec, bitSize))
 }
-- 
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