Hi Eilly , Thanks for your inputs. I have puts small portion of the complete code to replicate scenerio. I have used dumper and checked the results before and after execution of the loop and observed that even elseif condition was not satisfied, that loop got executed. I have modified my code as below to print initial and final value of the hash before and after the loop. 
foreach my $net(@netLst){ 
          //For debug
          foreach my $key_net (keys %{$moduleRef->{modRef}{$moduleName
+}{ioRef}}) {
             print "IN: moduleName = $moduleName; net = $key_net; indx
+ =   $moduleRef->{modRef}{$moduleName}{ioRef}{$key_net}{indx}\n";
          }   


        if($net =~ /\'/) {next;} 
        elsif(defined ($moduleRef->{modRef}{$moduleName}{ioRef}{$net})
+) 
        { 
         print "$net is part of hash "; 
        } 

          //For debug
          foreach my $key_net (keys %{$moduleRef->{modRef}{$moduleName
+}{ioRef}}) {
             print "OUT: moduleName = $moduleName; net = $key_net; ind
+x =   $moduleRef->{modRef}{$moduleName}{ioRef}{$key_net}{indx}\n";
          }   
}

[download]
It Printed output as below. 
IN: moduleName = msc_chan_reset; net = ch_rst_l; indx =   2
IN: moduleName = msc_chan_reset; net = data_in; indx =   3
IN: moduleName = msc_chan_reset; net = clk; indx =   0
IN: moduleName = msc_chan_reset; net = rst_l; indx =   1
IN: moduleName = msc_chan_reset; net = data_out; indx =   4
   ts_500_gated_clk_buf is hash part of hash
OUT: moduleName = msc_chan_reset; net = ch_rst_l; indx =   2
OUT: moduleName = msc_chan_reset; net = data_in; indx =   3
OUT: moduleName = msc_chan_reset; net = clk; indx =   0
OUT: moduleName = msc_chan_reset; net = ts_500_gated_clk_buf; indx =  
+ 
OUT: moduleName = msc_chan_reset; net = rst_l; indx =   1
OUT: moduleName = msc_chan_reset; net = data_out; indx =   4
####:

[download]
So here even though ts_500_gated_clk_buf was not part of the hash, it executed that loop and here on it added that hash with net ts_500_gated_clk_buf even though it wasn't intended. Thanks, Sandeep

In reply to Re^2: Wrong Results in checking if hash value is defined or not by sandeep.waikar
in thread Wrong Results in checking if hash value is defined or not by sandeep.waikar

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