How can I use macros in Perl?

Question

How do I use macros in Perl, like I do in C?

Example:

#define value 100 
print value; 

I want to get the output as 100.

Answer 1

For constants, the common way is to use a constant subroutine that will get inlined by the compiler:

use constant value => 100;

or

sub value () {100}