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using N function

• To: mathgroup at smc.vnet.net
• Subject: [mg76294] using N function
• From: kkwweett <kkwweett at hotmail.fr>
• Date: Sat, 19 May 2007 04:36:49 -0400 (EDT)

Good morning Mathematica users,


Can anyone tell me, please, which of a),b) or c) is wrong :

a)
<MathematicaHelp>
<quote>

N[expr] is equivalent to N[expr, MachinePrecision].

</quote>
</MathematicaHelp>

b)
In[1]:=N[Exp[Sqrt[163 ]Pi] - 6403203]
Out[1]=256.


c)
In[2]:=N[Exp[Sqrt[163 ]Pi] - 6403203,$MachinePrecision]
Out[2]=743.9999999999993

?

Thank you