Do you use use strict and use warnings? Where do you call build_sth('set_to_flag')?
This works:
#!/usr/bin/perl
use strict;
use warnings;
build_sth( 'set_to_flag' );
sub write_flag{
print "Success for flag.\n";
}
sub write_sets{print "Success for Set.\n"; }
sub do_nothing{print "Exit Here\n";}
sub build_sth{
my ($op_code) = @_;
my %Op = (
set_to_flag => \&write_flag,
set_tree => \&write_sets,
default => \&do_nothing
);
my $op_exec = $Op{$op_code} ;
if( defined $op_exec ){
$op_exec->();
}else{
print "Oops\n";
}
}
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