use strict;

for my $i (0 .. 20) {
   if (first_condition($i) .. second_condition($i)) {
        print "true for $i\n";
    } else {
        print "false for $i\n";
    }
}

sub first_condition {
    return $_[0] == 5;
}

sub second_condition {
    return $_[0] % 10 == 3;
}
__END__

false for 0
false for 1
false for 2
false for 3
false for 4
true for 5
true for 6
true for 7
true for 8
true for 9
true for 10
true for 11
true for 12
true for 13
false for 14
false for 15
false for 16
false for 17
false for 18
false for 19
false for 20