factorial using recursion+pointers [closed]

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i am learning C programming, i was trying to write a recursive function by using this prototype:

void fact(int *n);

The parameter of this function should be passed by reference. Thanks for your help.

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I don't feel to be helpful in giving a complete solution -- this is just to show there is an answer:

void fact(int *n)
{
    if (*n > 1)
    {
        int tmp = *n - 1;
        fact(&tmp);
        *n *= tmp;
    }
}

I would never write a factorial function this way.