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fmt, strconv: document that exponent is always two digits

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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>
This commit is contained in:
Ian Lance Taylor 2024-12-16 15:38:43 -08:00 • committed by Gopher Robot
parent 1218566fe5
commit 75736cc169
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3
src/fmt/doc.go
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@ -50,6 +50,9 @@ Floating-point and complex constituents:
%x hexadecimal notation (with decimal power of two exponent), e.g. -0x1.23abcp+20 %x hexadecimal notation (with decimal power of two exponent), e.g. -0x1.23abcp+20
%X upper-case hexadecimal notation, e.g. -0X1.23ABCP+20 %X upper-case hexadecimal notation, e.g. -0X1.23ABCP+20
The exponent is always a decimal integer.
For formats other than %b the exponent is at least two digits.
String and slice of bytes (treated equivalently with these verbs): String and slice of bytes (treated equivalently with these verbs):
%s the uninterpreted bytes of the string or slice %s the uninterpreted bytes of the string or slice

2
src/strconv/ftoa.go
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@ -44,6 +44,8 @@ var float64info = floatInfo{52, 11, -1023}
// zeros are removed). // zeros are removed).
// The special precision -1 uses the smallest number of digits // The special precision -1 uses the smallest number of digits
// necessary such that ParseFloat will return f exactly. // 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 { func FormatFloat(f float64, fmt byte, prec, bitSize int) string {
return string(genericFtoa(make([]byte, 0, max(prec+4, 24)), f, fmt, prec, bitSize)) return string(genericFtoa(make([]byte, 0, max(prec+4, 24)), f, fmt, prec, bitSize))
} }