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PowerToys/src/modules/cmdpal/ext
leileizhang 20dda12dbc [CmdPal]Limit exprtk result to 15 total digits with proper rounding (#40194)
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## Summary of the Pull Request
This PR addresses an issue where direct double output from exprtk
evaluation led to precision artifacts (e.g., 12.2 + 10 resulting in
22.199999999999999). This behavior is due to how double represents
decimal fractions in binary.

- To improve user-facing precision, the result is now:
- Converted to decimal for higher decimal accuracy.
- Rounded to fit within 15 total significant digits (integer +
fraction).
- Formatted using "G29" to eliminate unnecessary trailing zeros.
- Cleaned up to remove dangling decimal points.

This ensures more intuitive and readable output like:

- 1.9999999999 → "1.9999999999"
- 100000.9999999999 → "100001"
- 100000.999999999 → "100000.999999999"

This change improves clarity, especially for users entering expressions
expecting decimal-accurate results.

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## PR Checklist

- [ ] **Closes:** #40097 
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
2025-06-24 13:42:22 +08:00
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