[Octave-bug-tracker] [bug #40392] function parameter not used in while loop correctly

[John W. Eaton]

Update of bug #40392 (project octave):

              Item Group:        Incorrect Result => None                   
                  Status:                    None => Invalid                
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #7:

You are still modifying c inside the loop.  You just happen to get the result
you expect with a lower value.

Think about a simpler loop:


x = 10
while (x < 15)
  x = x + 10
end
x


The sequence of events here is

* set x to 10
* test whether x < 10; if not, then execute the loop.
* inside the loop, increment x by 10.  Now x is 20.
* test whether x is < 10.  It is not, so don't execute the loop.

The while loop condition doesn't prevent the value from becoming larger than
the limit if you increment the variable inside the loop.

I'm closing this report as invalid.


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