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  1. or download this
    C:\Windows\system32>perl -E" say 1+1/2**47;"                          
+         
1.00000000000001
C:\Windows\system32>perl -E" say 1+1/2**48;"
1
  2. or download this
    C:\Windows\system32>perl -E"$r=int rand(1e15+1); say $r==1e15 ? 1 : sp
+rintf '0.%015s', $r"

0.176483154296875