need some help getting this simple perl program to run

print "Rey Calculator";
print "\n";
print "Please Enter the first Number";
chomp($a = <STDIN>);
print "\n";
print "Please Enter the second Number\n";
chomp ($b = <STDIN>);
print "\n";
print "Please Enter the Operator"
chomp ($operation = <STDIN>);
print "\n";
#The following if statement assigns the command line arguments to a variable ($operation)
if ($operation eq +) {
$result = $a + $b;
}elsif ($operation eq -) {
$result = $a - $b;
}elsif ($operation eq /) {
$result = $a / $b;
}elsif ($operation eq x) {
$result = $a * $b;
}
print $a $operation $b = $result\n;


C:\>perl cal.pl
syntax error at cal.pl line 10, near "chomp"
Unrecognized character \x93 in column 19 at cal.pl line 13