#!/usr/bin/perl
use strict;
use warnings;

print "This is just a test\n";
MAIN_LOOP1:
print "Please enter a FIRST number, between 1 and 100: ";
my $X = <>;
chomp $X;
goto MAIN_LOOP1 unless $X =~ /^[1-9][0-9]?$|^100$/;
print "Now, onto the next step...\n";
MAIN_LOOP2:
print "Please enter a SECOND number, between 1 and 100: ";
my $Y = <>;
chomp $Y;
goto MAIN_LOOP2 unless $Y =~ /^[1-9][0-9]?$|^100$/;
print "Now, onto the calculations...\n";
printf "$X * $Y = %d\n", $X*$Y;
print "Finding the modulus\n";
printf "$X %% $Y = %d\n", $X%$Y;
print "Test finished!\n";

#!/usr/bin/perl

use strict;
use warnings;
use Scalar::Util qw(looks_like_number);

print "This is just a test\n";
my ($X, $Y);
FIRSTN:
print "Please, enter a FIRST number, between 1 and 100: ";
# Process user input
chomp($X = <>);
# Check for a valid input
if((looks_like_number($X)) && $X >= 1 && $X <= 100) {
    # User did enter a valid input continue with test
    goto SECONDN;
}
else {
    # User did not enter valid input
    goto FIRSTN;
}
SECONDN:
print "Please, enter a SECOND number, between 1 and 100: ";
chomp($Y = <>);
# Using another way of checking that the number range is valid
# Repeat as long is not a valid number
goto SECONDN unless (looks_like_number($Y) && $Y >= 1 && $Y <= 100);
# Format evaluation using printf and not print
printf "Test for multiplication\n$X * $Y = %d\n", $X*$Y;
printf "Test for modulus\n$X %% $Y = %d\n", $X%$Y;
print "Test is finished!\n";

#!/usr/bin/perl
use strict;
use warnings;

my ($X, $Y);
my @range = (1, 100);

$X = ask_number();

print "Now, onto the next step\n";

$Y = ask_number();

printf "$X * $Y = %d\n", $X * $Y;
printf "$X %% $Y = %d\n", $X % $Y;
print "Test finished!";

sub check_number {
    use Scalar::Util qw(looks_like_number);
    my $num = shift;
    looks_like_number($num) && $num >= $range[0] && $num <= $range[1];
}

sub ask_number {
    my $n;
    do {
        print "Please, enter a number, between $range[0] and $range[1], inclusive: ";
        chomp($n = <>);
    } while( not check_number($n) );
    $n;
}