Ambrus: Why does your choice of root depend on the sign of $b?

Returning a list containing both roots is quite reasonable for Perl, and then the calling function can decide what subset of them it wants to use.
I would also suggest a test for $a being too small, and then use a linear solution rather than trying to divide by zero.

In reply to Re^2: solving a quadratic equation by SuicideJunkie
in thread solving a quadratic equation by vis1982

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