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  1. import decimal
  2.  
  3. decimal.getcontext().prec = 70
  4. for f in [3e-178, 1e-320, 3e-320, "1e-325", "3e-325"]:
  5.      print("%s\t%s" % (f, decimal.Decimal(f).log10()))
Success #stdin #stdout 0.13s 14624KB
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stdout
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3e-178	-177.5228787452803375835172220093158130425818111446701314507791687173572
1e-320	-320.0000048349480421542963791664378178773271498211156984605956663618384
3e-320	-319.5228835802283797170013512631827025681270209569250025957658007215332
1e-325	-325
3e-325	-324.5228787452803375627049720967448846907998711358093041351701343596948
https://ideone.com/1Gb3pR
language:
Python 3 (python  3.9.5)
created:
11 years ago
visibility:
secret

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