Perl has no global variables. It sounds like you may want to look into one of two possibilities...
1 - Have program two call
require 'program_one.pl' at some point before it needs to use $total_orange, this technique will allow you to put $total_orange in the main package and use it as you want.
2 (better) - Make program one a seperate package (ie.
package Program_one with a function which can be called to calculate and return the desired value. Then program two needs to
use Program_one; and run
my $total_orange = Program_one::oranges();. This is the more desireable solution because it helps you to learn about files, packages and modules in perl.
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