Quiz 47: Find maximum value of XOR

Problem:

Given 2 number, find maximum XOR between them

Input Format: 

num 1
num 2

Output Format: 
Max XOR

Constraints: 
none

Sample Input

5
6

Sample Output:
3

Explanations:
5 XOR 5=0
5 XOR 6=3
6 XOR 6=0, so max is 3.

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Solution:

chomp($a=<STDIN>);
chomp($b=<STDIN>);
$c=0;
for($i=$a;$i<=$b;$i++)
{
for($j=$i;$j<=$b;$j++)
{
$tmp=$i ^ $j;
if($tmp>$c)
{
$c=$tmp;
}
}
}
print $c;

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Tips:

Find XOR for all possible combinations and print highest among them