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$j=0;

...
  print "\$i = $i and \$j = $j";
  $j++
}

for( $i=0,$j=0; $i<20,$j<20 ; $i++,$j++){
  print "\$i = $i and \$j = $j";
}

for( $i=0,$j=0; $i<20 or $j<20 ; $i++,$j++){
  print "\$i = $i and \$j = $j";
}

for( $i=0,$j=0; $i<20 and $j<20 ; $i++,$j++){
  print "\$i = $i and \$j = $j";
}