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#!/usr/local/bin/perl
$inputline = <STDIN>;
$inputline =~ s/^\s+|\s+$//g;
@list = split (/\s+/, $inputline);
$result = &rightcalc (0);
print ("The result is $result.\n");
sub rightcalc {
my ($index) = @_;
my ($result, $operand1, $operand2);
if ($index+3 == @list) {
$operand2 = $list[$index+2];
} else {
$operand2 = &rightcalc ($index+2);
}
$operand1 = $list[$index+1];
if ($list[$index] eq "+") {
$result = $operand1 + $operand2;
} elsif ($list[$index] eq "*") {
$result = $operand1 * $operand2;
} elsif ($list[$index] eq "-") {
$result = $operand1 - $operand2;
} else {
$result = $operand1 / $operand2;
}
}
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