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use warnings;
use strict;
...

print "Equals to: &add /n"

Scalar found where operator expected at temp.pl line 7, near "$add $fi
+rst_number"
...
Global symbol "$sixth_number" requires explicit package name at temp.p
+l line 7.
Execution of temp.pl aborted due to compilation errors.

Scalar found where operator expected at temp.pl line 7, near "$add $fi
+rst_number"

Global symbol "something" requires explicit package name at

print "Equals to: &add /n"

use strict;
use warnings;
...

print "The sum of input numbers equals to: $sum \n";