Newbie question about numbers

I'm new to Scheme.

In Java, for business math, I declare all my numbers that participate
 in calculations as BigDecimal.  In Scheme, I have seen that there is the
 notion of exactness. 

I understand that this should evaluate to false because the underlying
 representation is a double.

#;> (eqv? 1.2 (+ 1.1 0.1))
#f

It was my impression that putting #e in front of a litteral would for
 an exact representation, but the statement still fails.
#;> (eqv? #e1.2 (+ #e1.1 #e0.1))
#f

Any pointers to documentation that explains this further would be
 appreciated. Also, with siscweb, if I pull decimals out of a database, are
 they exact or inexact by default?

Scott Hickey
 


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