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‎01-28-2026 10:01 AM

HP Recommended

I would like to report a bug related to input boxes in **RPN mode** on the HP Prime.

**Summary**
In RPN mode, numeric input entered via an input box is automatically enclosed in single quotes, causing an error when the value is negative.

**Steps to Reproduce**

1. Set calculator to **RPN mode**.
2. Run a program that uses an input box for numeric input.
3. Enter a negative number (e.g.).
4. Validate the input.

**Actual Result**
The value is enclosed in single quotes (e.g. ) and an **“Invalid input”** error is generated.

**Expected Result**
Numeric input should not be enclosed in quotes, or negative numbers should be accepted without error.

**Notes**

* Occurs only in RPN mode.
* Positive numbers are accepted.
* Automatic insertion of quotes appears to be the root cause.
* A small example program is attached to reproduce the issue.

Best regards,
Ulisse Quadri

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