the beginner

hi all, i'am just starting this erlang. I try to make 
first aplication using windows as my os. I create a file 
at c>Program Files\erl5.2\math1.erl as user guide.
but while I compile it always show

./math1.erl:8: premature end
./math1.erl:8: no module definition
error

what is that mean ?

sorry for my stupied question

regards,

Wicak
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