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  1. or download this
    2 / 1 = 2
(2 + 1) / 2 = 1.5
...
( 1.4167 / 1.4118 ) / 2 = 1.4142
etc.
The more times you perform the above procedure, the more accurate your
+ answer.
  2. or download this
    #!/usr/bin/perl -w
use strict;
...
    my ($guess, $newguess) = @_;
    return (abs ($guess - $newguess)); # COMPARES HOW CLOSE OLD GUESS 
+AND NEW GUESS ARE
}