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st: Stata cannot do math?


From   Yu Xue <snowrain@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Stata cannot do math?
Date   Wed, 18 May 2011 18:44:14 -0500

Hi All,

This may be a stupid question. Here are the command and Stata output:

.set obs 50
.gen a=100.1
.count if a==100.1
0
.tab a
100.1
.sum a
variable  obs  mean  s.d.  min    max
a            50    100.1  0    100.1  100.1
.gen b=a-100
.tab b
0.0999985

So, Stata shows that a is equal to 100.1, but actually, it is equal to
100.0999985....

Can anyone explain to me what this is? Do I have to set precision when
I do math in Stata? How to set precision?
Thanks!

Yu
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