The values in @con are array references, not strings. They cannot be split.

The values in %HoA are array references. They must be dereferenced before printing. 

# Takes input in the form 'a,b|c'  
# How to run :  perl code.pl 'a,b|c' 'c,d|e' 'a,d|e'  
# Outputs a NX3 for the above input data.  
# Outputs connections in Nx2 form   
use Data::Dumper;  
  
  
$arg=join(' ',@ARGV);   
@det=split //, $arg;  
  
for ($i=0; $i <=8; $i++)  
{$trip[$i]=$det[2*$i];}  
  
my @array;  
while (@trip) {  
  push(@array, [ splice(@trip, 0, 3) ]);  
}  
print "@$_\n" for @array;  
   
for ($i=0; $i <=2; $i++)  
 {  
   for ($j=0; $j <=1; $j++)  
   { $con[$i][$j]=$array[$i][$j];}  
  }   
print "\n==========connections======\n";  
print "from->to\n";   
print " @$_\n" for @con; 
 
my %HoA;  
foreach (@con) {  
#   ($key, $value) = split; # replaced by wksmith
     my ($key, $value) = @$_; 
     push @{$HoA{$key}}, $value;  
}
# PRINTING THE HASH 
foreach (keys %HoA) { 
#print "$_ => $HoA{$_}\n"; #replaced by wksmith 
print "$_ => @{$HoA{$_}}\n";
}

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Note: Entries may be printed out of order.

In reply to Re: Problem printing/storing hash by BillKSmith
in thread Problem printing/storing hash by zing

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