Public bug reported:

Hello!

xfoil 6.99.dfsg-2 (xenial xerus standard installation) suffers from frequent 
crashes, always "SIGFPE: floating-point exception - erroneous arithmetic 
operation". This usually does happen during analysis (oper -> visc 100000 -> 
alfa), especially with "strange" airfoils.
But first of all it does seem to be a missing error handler, because a) 
Windows(tm) version from 
http://web.mit.edu/drela/Public/web/xfoil/XFOIL6.99.zip does not crash under 
same inputs and b) it also happens in a different simple setup (also only on 
xenial xerus, not Windows(tm)):

steps to reproduce:
1. start xfoil
2. enter "naca 0100" (this is an illegal NACA code)
result: xfoil crashes
expected: no crash, error message like "LEFIND:  LE point not found.  
Continuing..." expected

n.b.: normal operation is possible with "normal" airfoils usually and
results are reasonable.

I should be able to provide some example for a "strange" airfoil if
needed.

** Affects: xfoil (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1885919

Title:
  frequent crashes due to missing floating point exception handler

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