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sub sqrt ($) {
  my $x = shift;
...
}

test( $_ ) for( 16, 9, 4, 2, 0.5, -1, 0, 0.001 );

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SQRT 16: 4.0000114440918 ?= 4

...
SQRT 0: 0.0078125 ?= 0

SQRT 0.001: 0.03125 ?= 0.0316227766016838