dotnet/roslyn

Negative Zero double value showing as zero in Locals and Watch Windows

Open

#58,755 opened on Jan 10, 2022

View on GitHub
 (0 comments) (0 reactions) (0 assignees)C# (4,257 forks)batch import
Area-InteractiveBugDeveloper CommunityInteractive-Debugginghelp wanted

Repository metrics

Stars
 (20,414 stars)
PR merge metrics
 (Avg merge 6d 17h) (256 merged PRs in 30d)

Description

This issue has been moved from a ticket on Developer Community.

C# 8 - VS 2019 16.11.8 - .Net Core 3.1 project. Double value of zero multiplied by -1 (integer) yields a double with a negative zero value. However when the variable holding the computed value is displayed in the Locals or Watch window, it displays as 0 (zero) without a negative sign. Furthermore, adding the ",h" format to the display does not show the hexadecimal formatted value.

Original Comments

Feedback Bot on 1/3/2022, 08:17 PM:

Feedback Bot on 1/10/2022, 09:50 AM:

Original Solutions

(no solutions)

Contributor guide

Research direction
Investigate the debugger's expression evaluator to understand how it formats double values, specifically for negative zero. Review related code in the Roslyn debugger components for formatting of floating point numbers.
Tech stack
csharp
Domain
developer experience
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#debugger fundamentals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65