Thank you for your bug report but that's not a bug, you can do things like:
this=3
this+1 -> 4
** Changed in: gcalctool (Ubuntu)
Importance: Undecided => Low
** Changed in: gcalctool (Ubuntu)
Status: New => Invalid
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** Attachment added: "Screenshot at 2012-01-03 17:41:25.png"
https://bugs.launchpad.net/bugs/911141/+attachment/2655107/+files/Screenshot%20at%202012-01-03%2017%3A41%3A25.png
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