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  1. or download this
    ($lo, $hi) = unpack 'NN', pack 'd', 3.14159265358979;;

...

print unpack 'd', pack 'NN', 288179284, 4213246272;;
3.14159265358979
  2. or download this
    ( $_0, $_1, $_2, $_3 ) = unpack 'n*', pack 'd', exp(1);;

print unpack 'd', pack 'n*', $_0, $_1, $_2, $_3;;
2.71828182845905