The computation
appendFile file str function appends
the string
str, to the file
file.
Note that
writeFile and
appendFile write a literal
string to a file. To write a value of any printable type, as with
print, use the
show function to convert the value to a
string first.
main = appendFile "squares" (show [(x,x*x) | x <- [0,0.1..2]])