/
ch-1.raku
41 lines (34 loc) · 956 Bytes
/
ch-1.raku
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
#!/usr/bin/env raku
use v6.d;
sub count-primes(UInt:D $number --> Int) {
grep( &is-prime, 1..$number).elems;
}
sub sieve-of-eratosthenes(UInt:D $number --> Int) {
if $number < 2 {
return 0
} else {
my @primes = [2];
APPLICATIONS: for (2..$number) -> $applicant {
for @primes {
next APPLICATIONS if $applicant % $_ == 0;
}
@primes.append($applicant);
}
return @primes.elems;
}
}
#| Run test cases
multi sub MAIN('test') {
use Test;
plan 6;
is count-primes(10), 4, 'works for 10';
is count-primes(1), 0, 'works for 1';
is count-primes(20), 8, 'works for 20';
is sieve-of-eratosthenes(10), 4, 'works for 10';
is sieve-of-eratosthenes(1), 0, 'works for 1';
is sieve-of-eratosthenes(20), 8, 'works for 20';
}
#| Take user provided list like 1 17 8
multi sub MAIN(UInt $number) {
say count-primes($number);
}