#3625 NORM Untriag: Calculate gives error when first number is negative

[Zarro Boogs per Child]

#3625: Calculate gives error when first number is negative
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  Reporter:  AlexL                |       Owner:  rwh      
      Type:  defect               |      Status:  assigned 
  Priority:  normal               |   Milestone:  Untriaged
 Component:  calculator-activity  |     Version:           
Resolution:                       |    Keywords:           
  Verified:  0                    |  
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Changes (by rwh):

  * status:  new => assigned


Comment:

 Yes, I'm aware of this. The problem is that I check whether the first
 operator entered expects a value on the left. If so, I enter the previous
 answer. Maybe I'll just exclude the '-' operator from this logic, so that
 it's easier to enter negative numbers. Beside that, I'll make sure nothing
 gets inserted if there's no valid answer stored.

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Ticket URL: <https://dev.laptop.org/ticket/3625#comment:1>
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