Created
February 16, 2017 02:42
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| (datatype is-prime | |
| if (is-prime? N) | |
| N : number; | |
| ============== | |
| N : prime;) | |
| (define is-prime? | |
| X -> (prime* X (/ X 2) 2) where (number? X) | |
| _ -> false) | |
| (define prime* | |
| X Max Div -> false where (integer? (/ X Div)) | |
| X Max Div -> true where (> Div Max) | |
| X Max Div -> (prime* X Max (+ 1 Div))) | |
| \* | |
| Sample REPL interaction: | |
| (13+) 1 : prime | |
| 1 : prime | |
| (14+) 2 : prime | |
| type error | |
| *\ |
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Turn on the Shen type checker with
(tc +)to replicate example.