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Standard ML

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Standard ML is a functional programming language which is a dialect of ML (programming language). It is sometimes used for writing compilers and in theorem provers.


Here is an example of a factorial function written in a simple, non-tail recursive, style.

fun fac (0 : int) = 1    (*  the : int part means that 0 and n are integers *)
 |  fac (n : int) = n * fac (n - 1)