# Factorial in Standard ML

Example for versions
SML/NJ 110

This example shows the naive way to implement the factorial function. However, it is not tail recursive, since the recursive function call is not the only statement on the line. The `^`

operator concatenates strings. The `print`

function prints strings. The `Int.toString`

function converts integers into strings.

```
fun factorial n =
if n <= 1 then
1
else
factorial (n-1) * n;
fun aux n =
if n > 16 then
()
else (
print (Int.toString n ^ "! = " ^ Int.toString (factorial n) ^ "\n");
aux (n + 1)
);
aux 0;
```

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