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  1. or download this
    D:\>perl -le "print unpack 'd', pack 'd', sqrt 2;"
1.4142135623731
  2. or download this
    D:\>perl -le "print unpack 'd', pack 'd', sqrt 2;"
1.41421356237309515
  3. or download this
    D:\>perl -le "print unpack 'd', pack 'd', sqrt 2;"
1.41421356237309514547462185873883
  4. or download this
    D:\>perl -le "print 'WTF' if (unpack 'd', pack 'd', sqrt 2) != 1.41421
+35623731;"
WTF
  5. or download this
    D:\>perl -le "print 'WTF' if (unpack 'd', pack 'd', sqrt 2) != 1.41421
+356237309515;"
WTF
  6. or download this
    D:\>perl -le "print 'WTF' if (unpack 'd', pack 'd', sqrt 2) != 1.41421
+356237309514547462185873883;"
WTF