use strict;
use warnings;
use utf8;
use open ":utf8";
binmode STDIN, ':encoding(cp932)';
binmode STDOUT, ':encoding(cp932)';
binmode STDERR, ':encoding(cp932)';

open(DATAFILE, "+<", "data9-1.txt") or die("Error:$!");

print DATAFILE "加藤";

close(DATAFILE);

open(DATAFILE, "+<", "data9-1.txt") or die("Error:$!");

print "変更後:\n";

while(my $line = <DATAFILE>){
  chomp($line);
  print "$line\n";
}

close(DATAFILE);

open(DATAFILE, "+<", "data9-2.txt") or die("Error:$!");

print DATAFILE "加藤 花子\n";
print DATAFILE "東京都新宿区\n";
print DATAFILE "女性";

close(DATAFILE);