int a= 21;//10101
int b = 269;//100001101
a^b will do
10101
100001101
---------
100011000
but I want to do
10101
100001101
---------
001011101
Is there any way to do it without changing the original numbers?
You can shift a to align it with b on the left. The sample code below works with your example but does not properly handle overflows etc. It should give you a starting point though.
int a = 21;
int b = 269;
int shift = Integer.numberOfLeadingZeros(a) - Integer.numberOfLeadingZeros(b);
int c = (a << shift) ^ b;
System.out.println(Integer.toBinaryString(c)); // 1011101
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