rhai/scripts/primes.rhai
2020-05-30 10:30:21 +08:00

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// This script uses the Sieve of Eratosthenes to calculate prime numbers.
let now = timestamp();
const MAX_NUMBER_TO_CHECK = 100_000; // 9592 primes <= 100000
let prime_mask = [];
prime_mask.pad(MAX_NUMBER_TO_CHECK, true);
prime_mask[0] = false;
prime_mask[1] = false;
let total_primes_found = 0;
for p in range(2, MAX_NUMBER_TO_CHECK) {
if !prime_mask[p] { continue; }
print(p);
total_primes_found += 1;
for i in range(2 * p, MAX_NUMBER_TO_CHECK, p) {
prime_mask[i] = false;
i += p;
}
}
print("Total " + total_primes_found + " primes <= " + MAX_NUMBER_TO_CHECK);
print("Run time = " + now.elapsed + " seconds.");
if total_primes_found != 9_592 {
print("The answer is WRONG! Should be 9,592!");
}