In [1]:

    

x = 0.1


    

    
Out[1]:





0.1

In [4]:

    

get_rounding(Float64)


    

    
Out[4]:





Base.Rounding.RoundingMode{:Nearest}()

In [5]:

    

bits(x)


    

    
Out[5]:





"0011111110111001100110011001100110011001100110011001100110011010"

In [6]:

    

set_rounding(Float64, RoundDown)


    

    
Out[6]:





0

In [7]:

    

0.1


    

    
Out[7]:





0.09999999999999999

In [8]:

    

float("0.1")


    

    
Out[8]:





0.09999999999999999

In [9]:

    

set_rounding(Float64, RoundNearest)


    

    
Out[9]:





0

In [10]:

    

0.1


    

    
Out[10]:





0.1

In [11]:

    

big(0.1)


    

    
Out[11]:





1.000000000000000055511151231257827021181583404541015625e-01 with 256 bits of precision

In [13]:

    

bits(0.1*1.25)


    

    
Out[13]:





"0011111111000000000000000000000000000000000000000000000000000000"

In [14]:

    

set_rounding(Float64)
0.1*1.25


    

    
Out[14]:





0.12499999999999999

In [15]:

    

bits(ans)


    

    
Out[15]:





"0011111110111111111111111111111111111111111111111111111111111111"

In [16]:

    

versioninfo()


    

    




Julia Version 0.4.0-dev+3472
Commit 8c87a32* (2015-02-20 05:10 UTC)
Platform Info:
  System: Darwin (x86_64-apple-darwin13.4.0)
  CPU: Intel(R) Core(TM) i7-4750HQ CPU @ 2.00GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT NO_AFFINITY NEHALEM)
  LAPACK: libopenblas
  LIBM: libopenlibm
  LLVM: libLLVM-3.3

In [ ]: