Re: transpiling to low level C

On 23/12/2024 08:46, David Brown wrote:

Tim ruled out &&, ||, ?:, goto, break, continue, if, for, while, switch, do, labels, setjmp and longjmp.
 He didn't rule out recursion, or the relational operators, or any other part of C.
  int fact(int n);
 int fact_zero(int n) {
         return 1;
}
 int n_fact_n1(int n) {
         return n * fact(n - 1);
}
 int fact(int n) {
         return (int (*[])(int)){ fact_zero, n_fact_n1 }[(bool) n](n);
}
  There are additional fun things that can be done using different operators.  For an unsigned integer "n" that is not big enough to wrap, "(n + 2) / (n + 1) - 1"  evaluates "(n == 0)".

Isn't this just !n ? I don't think "!" was ruled out. This would also work for negative n.

And Tim did not rule out using the standard library, which would surely open up new possibilities.

printf (not sprintf) would be reasonable here to show results. Anything else could be considered cheating.
The original context was a small subset of C that can be used to represent a larger subset.