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my $n = 0xDEADBEEF;
print "$n\n";

# Output:
# 3735928559

# This works but is NOT recommended, and can be unsafe.
my $n = eval "0xDEADBEEF";
...

# Output:
# 3735928559

my $n = "0xDEADBEEF";
print "$n\n";

# Output:
# 0xDEADBEEF

my $string = "DEADBEEF";
my $n = hex($string);
...

# Output:
# 3735928559