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primes: prompt for START and END in interactive mode #993

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Merged
merged 1 commit into from
Nov 4, 2025
Merged

primes: prompt for START and END in interactive mode #993

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36 changes: 25 additions & 11 deletions bin/primes
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Original file line number Diff line number Diff line change
Expand Up @@ -23,19 +23,35 @@ my @primes = (2, 3, 5, 7, 11); # None have been tested
my @next_primes = (); # Avoid redoing work


my $VERSION = '1.002';
my $VERSION = '1.003';

END {
close STDOUT || die "$0: can't close stdout: $!\n";
$? = 1 if $? == 255; # from die
}

if (scalar(@ARGV) > 2) {
require Pod::Usage;
Pod::Usage::pod2usage({ -exitval => 1, -verbose => 0 });
my ($start, $end);
if (scalar(@ARGV) == 0) {
print "Start [default 2]: ";
chomp($start = <STDIN>);
$start = 2 unless $start =~ m/\S/;
print "End [default " . MAX . "]: ";
chomp($end = <STDIN>);
$end = MAX unless $end =~ m/\S/;
}
chomp(my $start = @ARGV ? $ARGV[0] : <STDIN>);
my $end = defined $ARGV[1] ? $ARGV[1] : MAX;
elsif (scalar(@ARGV) == 1) {
$start = $ARGV[0];
$end = MAX;
}
elsif (scalar(@ARGV) == 2) {
$start = $ARGV[0];
$end = $ARGV[1];
}
else {
require Pod::Usage;
Pod::Usage::pod2usage({ -exitval => 1, -verbose => 0 });
}

for ($start, $end) {
s/\A\s*\+?(\d{1,10})\Z/$1/ || die "$0: $_: illegal numeric format\n";
$_ > MAX && die "$0: $_: Numerical result out of range\n";
Expand Down Expand Up @@ -125,10 +141,9 @@ I<stop>. The I<start> value must be at least 0 and not greater than
stop. The I<stop> value must not be greater than 4294967295. The
default value of I<stop> is 4294967295.

When the primes utility is invoked with no arguments, I<start> is read
from standard input. I<stop> is taken to be 4294967295. The I<start>
value may be preceded by a single C<+>. The I<start> value is
terminated by a non-digit character (such as a newline).
When the primes utility is invoked with no arguments, values are read
from standard input. I<start> and I<stop> may be preceded by a single C<+>
character.

=head1 BUGS

Expand All @@ -147,4 +162,3 @@ This program is copyright (c) Jonathan Feinberg and Benjamin Tilly (1999).
This program is free and open software. You may use, modify, distribute,
and sell this program (and any modified variants) in any way you wish,
provided you do not restrict others from doing the same.

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