Your most likely bug is that 
my $medio=($izquierda+$derecha)<<2;

[download]
should be 
my $medio=($izquierda+$derecha) >> 1; # divide by 2

[download]

        "You're only given one little spark of madness. You mustn't lose it."         - Robin Williams

In reply to Re: Recursive Subroutin Problem by NetWallah
in thread Recursive Subroutin Problem by Panfi96

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