41 lines
710 B
Brainfuck
41 lines
710 B
Brainfuck
|
|
/* 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"
|
|
}
|
|
}
|