Shell Programming and Scripting

input =23412133
output = 234121330000 (depends on the number give at runtime)
 
i need to padd zeros based on runtime input . i tried below
printf ' %d%04d\n', "23412133";
 
But the precision 4 is static here how can i pass this as runtime input.
 
i am using this is shell script

 
While <read file>
do
ecode=`echo $line | cut -d"|" -f4`
length=`echo $line | cut -d"|" -f5`
 
example ecode will have 
34628
23492759
523489573
156232
123414
1233
 
length=10
 
output
3462800000
2349275900
 
i need to append zeros at the end of the each based on the length field

$ z=10
$ echo "1234 * 10^$z" | bc
12340000000000

$tmp=$ecode;
$count=0;

while($tmp>0)
{         $tmp=$tmp/10; $count++;      }

$output=$ecode*10^($length-$count);

print $output;

1212100000 1212199999