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class fraction(n,d)
method n()
return self.n
end
method d()
return self.d
end
method times(f)
return fraction(self.n * f$n(), self.d * f$d())
end
method asString()
return self.n||"/"||self.d
end
method asReal()
return real(self.n) / self.d
end
initially
if self.d=0 then stop("fraction: denominator=0")
end
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