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/* An example that finds all primes between 2 and limit. */ define primes (limit) { auto num, p, root, i prime[1] = 2; prime[2] = 3; num = 2; scale = 0; for ( p=5; p <= limit; p += 2) { root = sqrt(p); isprime = 1; for ( i = 1; i < num && prime[i] <= root; i++ ) { if ( p % prime[i] == 0 ) { isprime = 0; break; } } if (isprime) { num += 1; prime [num] = p; } } } print "\ntyping 'twins (10)' will print all twin primes less than 10.\n" define twins (limit) { auto i; i = primes(limit+2); for (i=1; prime[i] > 0; i++) { if ((prime[i]+2) == prime[i+1]) \ print "twins are ", prime[i], " and ", prime[i+1], "\n" } }
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